Identification_Information:
  Citation:
    Citation_Information:
      Originator: Burns, L.E.
      Originator: CGG
      Originator: Fugro GeoServices, Inc.
      Publication_Date: 2014
      Title: Farewell survey area: Airborne magnetic, electromagnetic and radiometric data in line (point), grid, vector, and map formats, McGrath and Lime Hills quadrangles, south-central Alaska
      Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, and vector digital data
      Series_Information:
        Series_Name: Geophysical Report
        Issue_Identification: GPR 2014-2
      Publication_Information:
        Publication_Place: Fairbanks, AK, USA
        Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
      Other_Citation_Details: 1 DVD, scale 1:63,360.
      Online_Linkage: http://dx.doi.org/10.14509/27291
      Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/276
  Description:
    Abstract: This digital publication, GPR 2014-2, contains data produced from airborne geophysical surveys conducted in 2012 and 2013 for the Farewell survey area in the McGrath and Yentna mining districts, McGrath and Lime Hills quadrangles, south-central Alaska. Aeromagnetic, electromagnetic (EM), and radiometric data were acquired by helicopter for about 954 sq miles, which includes the 100 sq mile Dalzell Creek area previously released. This publication incorporates data from the previously published Dalzell Creek area into the linedata, grids, maps, and other derivative pieces of this publication. CGG's frequency-domain DIGHEM V system was used for the EM data. GPR 2014-2 includes (1) raw and processed linedata; (2) gridded, Google Earth, and GeoTIFF formats of the calculated linedata; (3) maps of the data; and (4) vector files of data contours and flight lines.
    Purpose: The survey was part of the Strategic and Critical Minerals Capital Improvement Project (CIP), a subset of the Alaska Airborne Geophysical/Geological Mineral Inventory Program. The program was funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The program seeks to catalyze private-sector mineral development investment. The program delineates mineral zones on Alaska state lands that: 1) have major economic value; 2) can be developed in the short term to provide high quality jobs for Alaska; and 3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. Cook Inlet Region, Inc. (CIRI) contributed funding for a portion of the area.
    Supplemental_Information:
      The airborne data were acquired and processed under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and Fugro GeoServices, Inc. CGG, the subcontractor, acquired and processed the data in 2012 and 2013. A future publication will include the technical project report, interpretation map, and EM anomalies, as well as other files.
      Part of the survey is over CIRI land. Permits are needed from CIRI before planning exploration of or egress through their land. See approximate location in Figure 3 in the gpr2014-002_browsegraphic.pdf file. More information on accurate location and possible permitting are available using links or contacting people listed on the CIRI web site (http://www.ciri.com/our-lands/).
      This metadata file lists file names and definitions in the 'Entity_and_Attribute_Information' section. This information is also provided in the file 'gpr2014-002_readme.pdf'. Besides file names and definitions, the readme file contains map numbers and grid correlations, projection information, location figures, and much general information. In case the text version of 'gpr2014-002_readme.txt' needs to be used, the location figures are provided as jpegs in the main directory. Some detailed information about the data is given in the 'Entity_and_Attribute_Information' section of this metadata file. 'Farewell_linedata.txt' gives information on the linedata in an easy-to-read format. All data are provided in NAD27, UTM zone 5N, except for Google Earth KMZ files, which are in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. Besides NAD27, UTM zone 5N easting and northing coordinates, the linedata files also include latitude and longitude (Geographic Coordinate System with a WGS84 datum).
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 201209
        Ending_Date: 201406
    Currentness_Reference: publication date
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: None
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -154.54
      East_Bounding_Coordinate: -152.99
      North_Bounding_Coordinate: 62.52
      South_Bounding_Coordinate: 61.86
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: geoscientificInformation
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: Aeromagnetic Data
      Theme_Keyword: Aeromagnetic Map
      Theme_Keyword: Airborne Geophysical Survey
      Theme_Keyword: Apparent Resistivity Data
      Theme_Keyword: Apparent Resistivity Map
      Theme_Keyword: Digital Elevation Model
      Theme_Keyword: DIGHEM V EM System
      Theme_Keyword: Electromagnetic Data
      Theme_Keyword: First Vertical Derivative
      Theme_Keyword: Gamma Ray Survey
      Theme_Keyword: Geophysics
      Theme_Keyword: HEM Survey
      Theme_Keyword: Radiometric Survey
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Alaska, State of
      Place_Keyword: Lime Hills Quadrangle
      Place_Keyword: McGrath Mining District
      Place_Keyword: Yentna Mining District
  Access_Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
  Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  Browse_Graphic:
    Browse_Graphic_File_Name: gpr2014_002_browsegraphic.pdf
    Browse_Graphic_File_Description: The browse graphic file contains four location maps showing 1) survey area and adjacent published surveys within Alaska and 2) a more detailed view of the survey area, other published surveys, and currently ongoing (as of publication date) adjacent surveys, 3) survey area with location of Cook Inlet Region, Inc. land, and 4) maps sheets for 1:63,360-scale maps.
    Browse_Graphic_File_Type: PDF
  Data_Set_Credit: Funding was provided by the Alaska State Legislature for the Strategic and Critical Minerals Capital Improvement Project (CIP), a part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. CIRI provided funding for a portion of the survey.
  Native_Data_Set_Environment: Microsoft Windows 7 Professional Version 2009 Service Pack 1; Geosoft Oasis Montaj Version 7.3; Autocad Version 2000; ESRI Shape file format; ER Mapper; Adobe Acrobat Distiller v9.0; Adobe Acrobat Professional v9.0; CGG proprietary software
  Cross_Reference:
    Citation_Information:
      Originator: Burns, L.E.
      Originator: Fugro Airborne Surveys Corp.
      Originator: Stevens Exploration Management Corp.
      Publication_Date: 2008
      Title: Line, grid, and vector data and plot files for the airborne geophysical survey of the Styx River Survey, southcentral Alaska
      Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, vector digital data
      Series_Information:
        Series_Name: Geophysical Report
        Issue_Identification: GPR 2008-3
      Publication_Information:
        Publication_Place: Fairbanks, AK, USA
        Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
      Other_Citation_Details: 1 DVD
      Online_Linkage: http://dx.doi.org/10.14509/16561
      Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/266
  Cross_Reference:
    Citation_Information:
      Originator: Burns, L.E.
      Originator: Fugro Airborne Surveys Corp.
      Originator: Fugro GeoServices, Inc.
      Publication_Date: 2013
      Title: Middle Styx survey area: Airborne magnetic, electromagnetic, and radiometric data in line (point), grid, vector, and map formats, Lime Hills and Tyonek quadrangles, southcentral Alaska
      Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, vector digital data
      Series_Information:
        Series_Name: Geophysical Report
        Issue_Identification: GPR 2013-2
      Publication_Information:
        Publication_Place: Fairbanks, AK, USA
        Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
      Other_Citation_Details: 1 DVD
      Online_Linkage: http://dx.doi.org/10.14509/25419
      Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/215
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Survey contracts specified the conditions and specifications under which these data were collected. Altimeter, heading, lag, and frequent EM calibrations were done. More information will be available in the project report to be published in the future.
  Logical_Consistency_Report: Ownership of Fugro Airborne Surveys was changed from Fugro to CGG during the course of this contract. The same office, management, personnel, methods,  and attention to detail was carried over. The change was seamless. Fugro Airborne Surveys, and then CGG was responsible for collecting and processing the data. All the data were collected with the same instruments (magnetometers, electromagnetic bird and sensors, gamma ray spectrometer, altimeters, and navigational system).
  Completeness_Report: The linedata files Farewell_EM and Farewell_RAD each contain 3,746,037 records. The radiometric data, sampled every 1.0 seconds, produced a maximum of 374,603 sample points, about a tenth of the total maximum records. The linedata files have missing values for some of the resistivity points. These are due to terrain and the need to fly too high to resolve electromagnetic data with accuracy. Besides viewing in the linedata mag and EM database, the grids with 80 m cell size have fewer blank points than the grids with 25 m cell size.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m.
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: The laser altimeter ('ALTLAS_BIRD'), located in the bird (EM equipment and magnetometer housing), had a stated resolution of 0.10 meter. The ALTLAS_BIRD value may be unreliable over bodies of water where the laser returns are scattered.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Akima, H.
          Publication_Date: 1970
          Title: A new method of interpolation and smooth curve fitting based on local procedures
          Series_Information:
            Series_Name: Journal of the Association of Computing Machinery
            Issue_Identification: v. 7, no. 4
          Online_Linkage: None
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1970
        Source_Currentness_Reference: 1970
      Source_Citation_Abbreviation: Akima, 1970
      Source_Contribution: CGG used a modification of this method while making grids.
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Fraser, D.C.
          Publication_Date: 1978
          Title: Resistivity mapping with an airborne multicoil electromagnetic system
          Series_Information:
            Series_Name: Geophysics
            Issue_Identification: v. 43
          Online_Linkage: None
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1978
        Source_Currentness_Reference: 1978
      Source_Citation_Abbreviation: Fraser, 1978
      Source_Contribution: CGG used this method for calculating apparent depth and apparent resistivity
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: CGG
          Publication_Date: Unpublished material
          Title: set of original unprocessed and processed airborne geophysical data for the Dalzell Creek area that was acquired in 2012 and included in this publication
          Geospatial_Data_Presentation_Form: tabular digital data
      Type_of_Source_Media: digital
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2012
        Source_Currentness_Reference: 2012
      Source_Citation_Abbreviation: CGG, 2012
      Source_Contribution: CGG used these data to merge the Dalzell Creek and remaining Farewell survey
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Alaska Department of Natural Resources - Land Records Information Section
          Publication_Date: 1995
          Title: Alaska PLSS Section Grid
          Geospatial_Data_Presentation_Form: vector digital data
          Publication_Information:
            Publication_Place: Anchorage, Alaska
            Publisher: State of Alaska, Department of Natural Resources, Division, Land Records Information Section (LRIS)
          Other_Citation_Details: ESRI shape file format
      Type_of_Source_Media: online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1950
            Ending_Date: 1998
        Source_Currentness_Reference: 2008
      Source_Citation_Abbreviation: ADNR-LRIS, 1995
      Source_Contribution: The downloaded section grid file, built from original protraction diagram data, was used as a starting point for the section grid digital file included in GPR 2014-2. Minor formatting modifications were made to the file. The section grid is used on the maps without topography and is provided in digital format in this publication. The ending date for content, given above, reflects the current metadata file for the Alaska PLSS Section Grid.
    Process_Step:
      Process_Description:
        The airborne geophysical data in 2012 were acquired between October 11, 2012 to October 22, 2012 and from July 9, 2013 to September 27, 2013 with  DIGHEM (V) Electromagnetic (EM) systems,  Scintrex CS3 cesium magnetometer sensors, and  Radiation Solutions RS-500 256-channel gamma-ray spectrometers. The EM and magnetic sensors were flown at a height of 100 feet, with the magnetic sensor installed in the EM sensor. The spectrometer was flown at 200 ft AGL inside the helicopter. In addition, the survey recorded data from radar and laser altimeters, GPS navigation system, 50/60 Hz monitors, thermometer, barometric pressure instrument, and video camera.
        >
        Flights were performed with an Aerospatiale AS-350-B3 helicopter in 2012 and three Aerospatiale AS-350-B3 helicopters in 2013. All were flownat a mean terrain clearance of 200 feet (61 m) along N60E (120 degrees) survey flight lines with one-quarter mile (402.3 m) line spacing. Tie lines were flown at a heading of 30 degrees, perpendicular to the flight lines, and were spaced at intervals of approximately 3 miles (4,828 m).
        >
        Novatel OEM4-G2L Global Positioning Systems were used for navigation and flight path recovery. The helicopter positions were derived every 0.5 seconds (2 Hz); the ground GPS base station data were collected at 1.0 second (1 Hz) intervals. The positional xy data are interpolated from 2 Hz to 10 Hz. The use of the differentially-corrected base station data results in a positional accuracy of better than five meters. Flight path positions were projected onto the Clarke 1866 (UTM zone 5N) spheroid, 1927 North American datum using a central meridian (CM) of 153 degrees, a north constant of 0, and an east constant of 500,000.
      Process_Date: 2012
    Process_Step:
      Process_Description: The total magnetic field data were acquired with a sampling interval of 0.1 seconds. Data are contained in the files 'Farewell_EM.gdb' and 'Farewell_EM.xyz'. The raw magnetic data (channel 'mag_raw') were (1) corrected for measured system lag (resulting in channel 'mag_lag'), (2) corrected for diurnal variations by subtraction of the digitally recorded base station magnetic data (resulting in channel 'mag_diu'), (3) adjusted for regional variations (by subtracting IGRF model 2010, updated for date of flight and elevation variations), (4) leveled to the tie line data resulting in the final residual magnetic intensity (resulting in channel 'mag_rmi'), (5) manually leveled with final small microleveling, and (6) increased by a constant IGRF average value to restore the mag_rmi values to a total magnetic field channel (resulting in channel 'magigrf'). 'Mag_RMI' and 'MagIGRF' were then interpolated onto a regular 80-m grid using a modified Akima (1970) technique.
      Source_Used_Citation_Abbreviation: Akima, 1970
      Source_Used_Citation_Abbreviation: CGG, 2012
      Process_Date: 2013
    Process_Step:
      Process_Description:
        Three different algorithms were applied to the total magnetic field 80 m grid, resulting in three magnetic derivative grids. The analytic signal grid ('Frl_ASig') is the total amplitude of all directions of magnetic gradient calculated from the sum of the squares of the three orthogonal gradients. Mapped highs in the calculated analytic signal of the magnetic parameter locate the anomalous source body edges and corners (e.g., contacts, fault/shear zones, basement fault block boundaries or lithologic contacts, etc.). Analytic signal maxima are located directly over faults and contacts, regardless of structural dip, and independently of the direction of the induced and/or remanent body magnetizations.
        >
        The calculated magnetic tilt grid ('Frl_TiltDer') is the angle between the horizontal gradient and the total vertical gradient, and is useful for identifying the depth and type of magnetic source. The tilt angle is positive over the source, crosses through zero at, or near, the edge of a vertical sided source, and is negative outside the source zone. It has the added advantage of responding equally well to shallow and deep sources and is able to resolve deeper sources that may be masked by larger responses caused by shallower sources.
        >
        The first vertical derivative grid was calculated using a fast Fourier transform (FFT)-based frequency-domain filtering algorithm. The vertical gradient algorithm enhances the response of magnetic bodies in the upper 500 m and attenuates the response of deeper bodies. The resulting (calculated) vertical gradient grid ('Frl_1VD') provides better definition and resolution of near-surface magnetic units and helps to identify weak magnetic features that may not be evident in the total field data.
        >
        All magnetic and derivative magnetic grids were then resampled from the 80-m cell size down to a 25-m cell size using a modified Akima (1970) technique to produce the maps and final grids contained in this publication. When resampling the grids to a 25-m cell size, the original grids are scanned to determine the minimum and maximum values which the new grids are then limited to, avoiding extreme extrapolation errors between lines.
      Source_Used_Citation_Abbreviation: Akima, 1970
      Process_Date: 2013
    Process_Step:
      Process_Description:
        The DIGHEM (V) EM systems measured inphase and quadrature components at five frequencies. Two vertical coaxial-coil pairs operated at nominal frequencies of 1000 and 5500 Hz while three horizontal coplanar-coil pairs operated at 900, 7200, and 56,000 Hz. Actual frequencies for the four EM systems used are given in the project report in GPR2014-4. EM data were sampled at 0.1 second intervals. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The EM inphase and quadrature data were drift-corrected using base level data collected at high altitude (areas of no signal). Along-line filters are applied to the data to remove spheric spikes. The data were inspected for variations in phase, and a phase correction was applied to the data if necessary.
        >
        The apparent resistivity and depth were then calculated from the inphase and quadrature data for all coplanar frequencies. The calculation used the pseudo-layer (or buried) half-space model defined by Fraser (1978).  This model consists of a resistive layer overlying a conductive half-space. The apparent depth is defined as the sensor-source distance minus the measured altitude of the sensor above the ground. The apparent depth channels estimate the depth below surface of a conductive half-space and are the apparent thickness of the overlying resistive layer. The apparent depth (or thickness) parameter will be positive when the upper layer is more resistive than the underlying material, in which case the apparent depth may be quite close to the true depth assuming it is a buried halfspace and altimeter is correct. The apparent depth will be negative when the upper layer is more conductive than the underlying material, and will be zero when a homogeneous half-space exists.  The apparent depth parameter must be interpreted cautiously because it will contain any errors that might exist in the measured altitude of the EM bird (e.g., as caused by a dense tree cover). Manual leveling of the inphase and quadrature of each coil pair, based on the resistivity data and comparisons to the data from the other frequencies, was performed. Automated micro-leveling is carried out in areas of low signal.
        >
        The EM data were interpolated onto a regular 80-m grid using a modified Akima (1970) technique. The resulting grids were subjected to a 3x3 Hanning filter and resampled to a 25-m cell size before contouring and map production. When re-sampling the grids to a 25-m cell size, the original grids are scanned to determine the minimum and maximum values which the new grids are then limited to, avoiding extreme extrapolation errors between lines.
      Source_Used_Citation_Abbreviation: Frasier, 1978
      Source_Used_Citation_Abbreviation: CGG, 2012
      Source_Used_Citation_Abbreviation: Akima, 1970
      Process_Date: 2014
    Process_Step:
      Process_Description: The gamma-ray spectrometry data were recorded at a 1.0 second sample rate using a Radiation Solutions RS-500 gamma-ray spectrometer. It was configured with 16.8L (1024 cubic inches) of main (downward) NaI crystal detector, and 4.2L (256 cubic inches) of upward looking (radon) detector. After application of Noise Adjusted Singular Value Decomposition to the spectra, counts from the main detector were recorded in five windows corresponding to thorium (2410-2810 keV), uranium (1660-1860 keV), potassium (1370-1570 keV), total radioactivity (400-2815 keV) and cosmic radiation (3000->6000 keV). Counts from the radon detector were recorded in the radon window (1660-1860 keV). The radon detection system was calibrated following methods outlined in IAEA Report 1363. After removal of the background, the data were corrected for spectral interferences, changes in temperature, pressure, and departures from the planned survey elevation of 200 feet. The data were then converted to standard concentration units which were interpolated to a 100-m grid using a minimum curvature technique. All grids were then resampled from the 100-m cell size down to a 25-m cell size to produce the maps and final grids contained in this publication. When re-sampling the grids to a 25-m cell size, the original grids are scanned to determine the minimum and maximum values which the new grids are then limited to, avoiding extreme extrapolation errors between lines.
      Source_Used_Citation_Abbreviation: IAEA TECDOC-1363, 2003
      Source_Used_Citation_Abbreviation: CGG, 2012
      Source_Used_Citation_Abbreviation: Akima, 1970
      Process_Date: 2014
    Process_Step:
      Process_Description: The digital elevation/terrain model was produced from the differentially corrected GPS-Z data (channel 'GPSZ' in linedata files 'Farewell_EM' and 'Farewell_RAD') and the laser altimeter data measured in the bird (channel 'ALTLAS_BIRD' included in the same files). Both the GPSZ and ALTLAS_BIRD data were checked for spikes, which were removed manually. The ALTLAS_BIRD data were despiked and then filtered using a 13 median filter, followed by a 13 Hanning filter. The corrected altimeter data were then subtracted from the GPSZ data to produce profiles of the height above mean sea level along the survey lines. The data were manually leveled to remove any errors between lines. After all leveling, the data were DC shifted to match the local maps, in this case, NAD27. The 80-m DTM grid was then resampled to a 25-m cell size to produce the DTM grid contained in this publication.
      Source_Used_Citation_Abbreviation: Akima, 1970
      Process_Date: 2013
    Process_Step:
      Process_Description: DGGS downloaded the Alaska PLSS Section Grid shapefile in fall 2010 and subset this in-house version to roughly fit the map sheets for this publication using MapInfo Professional. Fugro Airborne Surveys modified the formatting of the file using AutoCad, changing township and range line widths and colors, and added township and range labels. The modified file was then used as overlays on maps without topography.
      Source_Used_Citation_Abbreviation: ADNR-LRIS, 1995
      Process_Date: 2013
    Process_Step:
      Process_Description: All grids with 25 m cell size and the radiometric ternary diagram were converted to GeoTIFFS and KMZs using CGG's specialized software. The 80 m cell size grids for the 56,000, 7200, and 900 coplanar grids were also converted to GeoTIFFs and KMZs.
      Process_Date: 2014
    Process_Step:
      Process_Description: The HPGL/2 files were created with HP Designjet 5000 printer driver v5.32 and plot on some plotters, but not all plotters correctly. The Adobe Acrobat format files were created with Adobe Acrobat Distiller v9.0 from Postscript files.
      Process_Date: 2014
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 5
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.9996
            Longitude_of_Central_Meridian: -153
            Latitude_of_Projection_Origin: 0
            False_Easting: 500000
            False_Northing: 0
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: row and column
        Coordinate_Representation:
          Abscissa_Resolution: 25
          Ordinate_Resolution: 25
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 6378206.4
      Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Farewell_EM.GDB and Farewell_EM.XYZ
      Entity_Type_Definition: The file 'Farewell_EM' contains raw and processed linedata and related calculated fields for locational, magnetic, and electromagnetic data. The file is provided in Geosoft binary grid (GRD) and Geosoft ASCII XYZ (XYZ) formats; formatting varies slightly between these. Except for the 'LINE' attribute, all attributes, including 'DATE' and 'FLIGHT', are represented by one of the 50 data columns on each record. The 'LINE' and 'FLIGHT' attributes are discussed further in the attribute 'ID Cell'.
      Entity_Type_Definition_Source: L.E. Burns & Fugro Airborne Surveys
      Entity_Attribute_Layer_Name: MAG and EM LINEDATA
    Attribute:
      Attribute_Label: ID_CELL
      Attribute_Definition:
        The 'ID CELL' occurs in the GDB file only; the contents of the 'ID CELL' are also present in the XYZ file. In the 'ID CELL' for this project, the 'LINE' attribute is followed by a colon followed by the 'FLIGHT' attribute (e.g., 'L30010:4018' and 'T39010:4034'). More than one line is typically flown on a particular date and flight; more than one flight may be flown on a particular date. Each ID-cell value will have an associated spreadsheet view consisting of a column for each of the 50 attributes. In the XYZ file, the 'LINE' and 'FLIGHT' attributes and the 'DATE' are present as header lines, one attribute per line, before each set of associated data, for example:
        >  //Flight 4018
        >  //Date 2012/09/24
        >  Line 30010 (or Tie instead of Line when appropriate)
        >  Followed by all records for points sampled along Line 30010.
        >     (Pattern is repeated for each line number).
        The 'ID CELL' content, particularly combined with the definitions below for this particular survey, provides information about the flight line layout.
      Attribute_Definition_Source: L.E. Burns & Fugro Airborne Surveys
      Attribute_Domain_Values:
        Unrepresentable_Domain:
          Definitions of the 'LINE' and 'FLIGHT' attributes are listed below.
          > LINE TYPES and SYMBOLS:
          > Traverse lines - flown at a heading of 120 degrees (NW-SE)
          > Tie lines      - flown at a heading of 30 degrees (NE-SW)
          > Border lines   - present inside and parallel to the survey
          >                  tract border where traverse or tie lines
          >                  are not parallel to the border
          > Traverse lines - 'L' (GDB file); 'LINE' (XYZ file)
          > Tie and border lines - 'T' (GDB file); 'TIE' (XYZ file)
          >------------------------------------------------------------
          > LINE NUMBERS
          > Planned flight lines increase by 10 in a consistent fashion. For this project, traverse line numbers increase from north to south; tie line numbers increase from southwest to northeast; and border line numbers increase in a clockwise direction.
          >
          > When more than one uninterrupted flight traverse was needed to complete a planned flight line, the fifth digit of the line number is increased by '1' for each new flight segment/version.
          >------------------------------------------------------------
          > 'FLIGHT' DESIGNATORS
          > Three different HeliDAS (data acquisition systems) units were used, and are designated '4', '24', and '29'. The first digit of the 4 digit flight designators and the first two numbers of the 5 digits flight designators identify the HeliDAS (data acquisition system). The remaining three digits are the flight identification number, e.g., '018'.
    Attribute:
      Attribute_Label: x_NAD27z5N
      Attribute_Definition: easting NAD 27 (UTM Zone 5N)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 476045.34
          Range_Domain_Maximum: 501309.41
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: y_NAD27z5N
      Attribute_Definition: northing NAD 27 (UTM Zone 5N)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 6844483.07
          Range_Domain_Maximum: 6872140.01
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: fid
      Attribute_Definition: Fiducial increment; the time in tenths of seconds from the start to the end of the particular flight. Sampling typically occurred at each fiducial for almost all items in the database.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: The attribute measurement resolution is 0.1 second. The values increase from the beginning of a flight to the end. Only FIDs during production flights are included in the database.
    Attribute:
      Attribute_Label: lat_WGS84
      Attribute_Definition: latitude WGS 84
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 61.7338904
          Range_Domain_Maximum: 61.9828849
          Attribute_Units_of_Measure: degrees
    Attribute:
      Attribute_Label: lon_WGS84
      Attribute_Definition: longitude WGS 84
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -153.4557404
          Range_Domain_Maximum: -152.9774646
          Attribute_Units_of_Measure: degrees
    Attribute:
      Attribute_Label: flight
      Attribute_Definition:
        The first digit of the 4 digit flight numbers and the first 2 digits of the 5 digit flight numbers are  CGGs identification number for the HeliDAS (data acquisition) systems for this survey, i.e., '4', '24', and '29'. The last three digits represent the flight numbers associated with this project. A flight number is the number of the helicopter flight from home base to home base associated with this project. The flights are numbered from the beginning of the project to the end. Only those flight numbers containing acquisition of final data measurements are included in the database.
        Four different flying periods and helicopters were used during data acquisition. Four ranges of flight numbers are given below, and correspond, in order, to the four sets of dates in the 'DATE' attributes immediately following.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 4052
          Range_Domain_Maximum: 4088
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 4175
          Range_Domain_Maximum: 4198
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 24091
          Range_Domain_Maximum: 24251
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 29001
          Range_Domain_Maximum: 29058
          Attribute_Units_of_Measure: flight
    Attribute:
      Attribute_Label: date
      Attribute_Definition: flight date (yyyy/mm/dd)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain:
          The dates for the four periods of flying by four different helicopters are: 2012/10/11-2012/10/22,
          2013/09/17-2013/09/24, 2013/07/09-2013/09/27, 2013/08/31-2013/09/26
    Attribute:
      Attribute_Label: altrad_calcbird
      Attribute_Definition: calculated bird height above surface to simulate location of radar altimeter in the bird; radar altimeter measurement was recorded in helicopter. Altrad_calcbird was calculated by subtracting a constant representing the distance in altitude from helicopter to the bird when towing and recording data.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 12.57
          Range_Domain_Maximum: 348.28
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: altlas_bird
      Attribute_Definition: bird height above surface, measured by laser altimeter in the EM bird
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 6.92
          Range_Domain_Maximum: 394.87
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: gpsz
      Attribute_Definition: bird height above spheroid. The GPSZ (or GPS-Z) value is primarily dependent on the number of available satellites. Although post-processing of GPS data will yield X and Y accuracies on the order of 1 meter, the accuracy of the Z value is usually much less, sometimes in the +/-20 meter range.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 646.06
          Range_Domain_Maximum: 2074.59
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: dtm
      Attribute_Definition: digital terrain model (NAD27 UTM zone 5N); calculated from channel 'GPS-Z' and the laser data (channel 'ALTLAS_BIRD') measured in the bird
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 601.97
          Range_Domain_Maximum: 2043.65
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: diurnal_filt
      Attribute_Definition: measured diurnal ground magnetic intensity; interpolated to 0.1 sec. from 1.0 second measurements
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55604.12
          Range_Domain_Maximum: 55869.11
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: diurnal_cor
      Attribute_Definition: diurnal correction - base removed; calculated from interpolated diurnal_filt
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -153.88
          Range_Domain_Maximum: 111.11
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: mag_raw
      Attribute_Definition: total magnetic field - spike rejected
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55344.41
          Range_Domain_Maximum: 56714.99
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: mag_lag
      Attribute_Definition: total magnetic field - corrected for lag
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55344.41
          Range_Domain_Maximum: 56714.99
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: mag_diu
      Attribute_Definition: total magnetic field - diurnal variation removed
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55336.00
          Range_Domain_Maximum: 56707.61
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: igrf
      Attribute_Definition: international geomagnetic reference field
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55638.98
          Range_Domain_Maximum: 55761.86
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: mag_rmi
      Attribute_Definition: residual magnetic intensity - IGRF removed, then leveled - final
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -353.95
          Range_Domain_Maximum: 1049.32
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: magigrf
      Attribute_Definition: total magnetic field with IGRF removed - mag_rmi with constant added back - final
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 55265.65
          Range_Domain_Maximum: 56668.92
          Attribute_Units_of_Measure: nT
    Attribute:
      Attribute_Label: cpi900_FILT
      Attribute_Definition: coplanar inphase 900 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -214.04
          Range_Domain_Maximum: 180.49
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq900_FILT
      Attribute_Definition: coplanar quadrature 900 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -5.97
          Range_Domain_Maximum: 320.57
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxi1000_FILT
      Attribute_Definition: coaxial inphase 1000 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -68.98
          Range_Domain_Maximum: 81.75
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxq1000_FILT
      Attribute_Definition: coaxial quadrature 1000 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -12.18
          Range_Domain_Maximum: 89.46
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxi5500_FILT
      Attribute_Definition: coaxial inphase 5500 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -66.67
          Range_Domain_Maximum: 162.71
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxq5500_FILT
      Attribute_Definition: coaxial quadrature 5500 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -13.53
          Range_Domain_Maximum: 168.16
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpi7200_FILT
      Attribute_Definition: coplanar inphase 7200 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -144.88
          Range_Domain_Maximum: 568.05
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq7200_FILT
      Attribute_Definition: coplanar quadrature 7200 Hz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -15.49
          Range_Domain_Maximum: 454.17
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpi56K_FILT
      Attribute_Definition: coplanar inphase 56 kHz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -136.41
          Range_Domain_Maximum: 895.69
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq56K_FILT
      Attribute_Definition: coplanar quadrature 56 kHz - unlevelled
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -128.70
          Range_Domain_Maximum: 1095.02
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpi900
      Attribute_Definition: coplanar inphase 900 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -215.71
          Range_Domain_Maximum: 178.70
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq900
      Attribute_Definition: coplanar quadrature 900 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -2.64
          Range_Domain_Maximum: 320.40
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxi1000
      Attribute_Definition: coaxial inphase 1000 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -69.11
          Range_Domain_Maximum: 78.23
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxq1000
      Attribute_Definition: coaxial quadrature 1000 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -11.17
          Range_Domain_Maximum: 89.07
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxi5500
      Attribute_Definition: coaxial inphase 5500 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -62.90
          Range_Domain_Maximum: 163.30
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cxq5500
      Attribute_Definition: coaxial quadrature 5500 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -1.51
          Range_Domain_Maximum: 168.56
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpi7200
      Attribute_Definition: coplanar inphase 7200 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -145.50
          Range_Domain_Maximum: 568.08
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq7200
      Attribute_Definition: coplanar quadrature 7200 Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -1.05
          Range_Domain_Maximum: 454.23
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpi56k
      Attribute_Definition: coplanar inphase 56k Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -130.48
          Range_Domain_Maximum: 895.71
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: cpq56K
      Attribute_Definition: coplanar quadrature 56k Hz
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -1.11
          Range_Domain_Maximum: 1092.92
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: res900
      Attribute_Definition: apparent resistivity 900 Hz; cut-off value for apparent resistivity was 1325; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.56
          Range_Domain_Maximum: 1325
          Attribute_Units_of_Measure: ohm-m
    Attribute:
      Attribute_Label: res7200
      Attribute_Definition: apparent resistivity 7200 Hz; cut-off value for apparent resistivity was 10750; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 17.00
          Range_Domain_Maximum: 10750
          Attribute_Units_of_Measure: ohm-m
    Attribute:
      Attribute_Label: res56K
      Attribute_Definition: apparent resistivity 56k Hz; cut-off value for apparent resistivity was 60000; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 25.16
          Range_Domain_Maximum: 60000
          Attribute_Units_of_Measure: ohm-m
    Attribute:
      Attribute_Label: dep900
      Attribute_Definition: apparent depth 900 Hz; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -111.33
          Range_Domain_Maximum: 313.15
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: dep7200
      Attribute_Definition: apparent depth 7200 Hz; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -105.96
          Range_Domain_Maximum: 82.82
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: dep56K
      Attribute_Definition: apparent depth 56k Hz; more information in process steps
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -124.65
          Range_Domain_Maximum: 49.33
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: difi
      Attribute_Definition: difference channel based on cxi5500 & cpi7200
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -38.82
          Range_Domain_Maximum: 65.09
          Attribute_Units_of_Measure: unitless
    Attribute:
      Attribute_Label: difq
      Attribute_Definition: difference channel based on cxq5500 & cpq7200
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -13.71
          Range_Domain_Maximum: 96.31
          Attribute_Units_of_Measure: unitless
    Attribute:
      Attribute_Label: cppl
      Attribute_Definition: coplanar powerline monitor
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 0.00
          Attribute_Units_of_Measure: unitless
    Attribute:
      Attribute_Label: cxsp
      Attribute_Definition: coaxial spherics monitor
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 0.00
          Attribute_Units_of_Measure: unitless
    Attribute:
      Attribute_Label: cpsp
      Attribute_Definition: coplanar spherics monitor
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 0.00
          Attribute_Units_of_Measure: unitless
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Farewell_RAD.GDB and Farewell_RAD.XYZ
      Entity_Type_Definition: The file 'Farewell_RAD' contains raw and processed linedata and related calculated fields for locational and radiometric data. The linedata file is provided in Geosoft binary grid (GRD) and Geosoft ASCII XYZ (XYZ) formats. Except for the 'LINE' attribute, all attributes, including 'DATE' and 'FLIGHT', are represented by one of the 31 data columns on each record. The 'LINE' and 'FLIGHT' attributes are discussed further in the attribute 'ID Cell'.
      Entity_Type_Definition_Source: L.E. Burns & CGG
      Entity_Attribute_Layer_Name: RAD LINEDATA
    Attribute:
      Attribute_Label: ID_CELL
      Attribute_Definition: The 'ID CELL' definition and the items mentioned under "Unrepresentable_Domain" for the RAD database is the same as given above for those items in MAG and EM LINEDATA.
      Attribute_Definition_Source: L.E. Burns & CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Described above in MAG and EM LINEDATA
    Attribute:
      Attribute_Label: X_NAD27z5N
      Attribute_Definition: easting NAD27 (UTM Zone 5N)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 420740.34
          Range_Domain_Maximum: 500091.67
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: Y_NAD27z5N
      Attribute_Definition: northing NAD27 (UTM Zone 5N)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 6858521.16
          Range_Domain_Maximum: 6933064.87
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: FID
      Attribute_Definition: Fiducial increment; the time in tenths of seconds from the start to the end of the particular flight. Sampling typically occurred at each fiducial for almost all items in the database.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: The attribute measurement resolution is 0.1 second. The values increase from the beginning of a flight to the end. Only FIDs during production flights are included in the database.
    Attribute:
      Attribute_Label: LAT_WGS84
      Attribute_Definition: latitude WGS84
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 61.8571838
          Range_Domain_Maximum: 62.5296413
          Attribute_Units_of_Measure: degrees
    Attribute:
      Attribute_Label: LON_WGS84
      Attribute_Definition: longitude WGS84
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -154.5210218
          Range_Domain_Maximum: -153.0005977
          Attribute_Units_of_Measure: degrees
    Attribute:
      Attribute_Label: FLIGHT
      Attribute_Definition:
        The first digit of the 4 digit flight numbers and the first 2 digits of the 5 digit flight numbers are  CGGs identification number for the HeliDAS (data acquisition) systems for this survey, i.e., '4', '24', and '29'. The last three digits represent the flight numbers associated with this project. A flight number is the number of the helicopter flight from home base to home base associated with this project. The flights are numbered from the beginning of the project to the end. Only those flight numbers containing acquisition of final data measurements are included in the database.
        Four different flying periods and helicopters were used during data acquisition. Four ranges of flight numbers are given below, and correspond, in order, to the four sets of dates in the 'DATE' attributes immediately following.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 4052
          Range_Domain_Maximum: 4088
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 4175
          Range_Domain_Maximum: 4198
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 24091
          Range_Domain_Maximum: 24251
          Attribute_Units_of_Measure: flight
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 29001
          Range_Domain_Maximum: 29058
          Attribute_Units_of_Measure: flight
    Attribute:
      Attribute_Label: date
      Attribute_Definition: flight date (yyyy/mm/dd)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: The dates for the four periods of flying by four different helicopters are: 2012/10/11-2012/10/22, 2013/09/17-2013/09/24, 2013/07/09-2013/09/27, and 2013/08/31-2013/09/26
    Attribute:
      Attribute_Label: ALTRAD_HELI
      Attribute_Definition: helicopter height above surface from radar altimeter
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 32.14
          Range_Domain_Maximum: 613.18
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: DTM
      Attribute_Definition: Digital terrain/elevation model (NAD27 UTM Zone 5N); data in m. Elevation calculation used for the digital elevation model is directly dependent on the accuracy of the two input parameters, ALTBIRD and GPSZ. The ALTBIRD value may be unreliable in areas of heavy tree cover, where the altimeter reflects the distance to the tree canopy rather than the ground. Although post-processing of GPS data will yield X and Y accuracies on the order of 1 meter, the accuracy of the Z value (GPSZ) is usually much less, sometimes in the +/-20 meter range.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 453.69
          Range_Domain_Maximum: 2513.75
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: TC_RAW
      Attribute_Definition: raw total counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 190
          Range_Domain_Maximum: 5217
          Attribute_Units_of_Measure: counts
    Attribute:
      Attribute_Label: Th_RAW
      Attribute_Definition: raw thorium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 178
          Attribute_Units_of_Measure: counts
    Attribute:
      Attribute_Label: U_RAW
      Attribute_Definition: raw uranium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 184
          Attribute_Units_of_Measure: counts
    Attribute:
      Attribute_Label: K_RAW
      Attribute_Definition: raw potassium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 7
          Range_Domain_Maximum: 505
          Attribute_Units_of_Measure: counts
    Attribute:
      Attribute_Label: U_UP
      Attribute_Definition: raw upward looking uranium
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -3
          Range_Domain_Maximum: 39
          Attribute_Units_of_Measure: counts
    Attribute:
      Attribute_Label: Cosmic
      Attribute_Definition: cosmic counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 46
          Range_Domain_Maximum: 228
          Attribute_Units_of_Measure: cps (counts per second)
    Attribute:
      Attribute_Label: EffectiveHeight
      Attribute_Definition: effective height at STP (standard temperature and pressure)
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 34.92
          Range_Domain_Maximum: 2032.65
          Attribute_Units_of_Measure: m
    Attribute:
      Attribute_Label: LIVETIME
      Attribute_Definition: live time
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 819
          Range_Domain_Maximum: 999
          Attribute_Units_of_Measure: ms (millisecond)
    Attribute:
      Attribute_Label: KPA
      Attribute_Definition: barometric pressure
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 74.30
          Range_Domain_Maximum: 97.90
          Attribute_Units_of_Measure: kPa (kilopascal)
    Attribute:
      Attribute_Label: TEMP_EXT
      Attribute_Definition: external temperature in Celsius
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: -14.8
          Range_Domain_Maximum: 24.0
          Attribute_Units_of_Measure: C (Celsius)
    Attribute:
      Attribute_Label: TC
      Attribute_Definition: corrected total counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 5164.28
          Attribute_Units_of_Measure: cps (counts per second)
    Attribute:
      Attribute_Label: Th
      Attribute_Definition: corrected thorium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 169.33
          Attribute_Units_of_Measure: cps (counts per second)
    Attribute:
      Attribute_Label: U
      Attribute_Definition: corrected uranium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 106.05
          Attribute_Units_of_Measure: cps (counts per second)
    Attribute:
      Attribute_Label: K
      Attribute_Definition: corrected potassium counts
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 607.87
          Attribute_Units_of_Measure: cps (counts per second)
    Attribute:
      Attribute_Label: eU
      Attribute_Definition: uranium concentration
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 16.37
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: eTh
      Attribute_Definition: thorium concentration
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 44.80
          Attribute_Units_of_Measure: ppm
    Attribute:
      Attribute_Label: percentK
      Attribute_Definition: potassium concentration
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 10.44
          Attribute_Units_of_Measure: %
    Attribute:
      Attribute_Label: ratio_eU_percentK
      Attribute_Definition: uranium/potassium concentration ratio
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.08
          Range_Domain_Maximum: 20.55
          Attribute_Units_of_Measure: ppm/%
    Attribute:
      Attribute_Label: ratio_eTh_percentK
      Attribute_Definition: thorium/potassium concentration ratio
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.14
          Range_Domain_Maximum: 26.92
          Attribute_Units_of_Measure: ppm/%
    Attribute:
      Attribute_Label: ratio_eU_eTh
      Attribute_Definition: uranium/thorium concentration ratio
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.01
          Range_Domain_Maximum: 15.44
          Attribute_Units_of_Measure: unitless
    Attribute:
      Attribute_Label: nadr
      Attribute_Definition: natural air absorbed dose rate
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0.00
          Range_Domain_Maximum: 295.58
          Attribute_Units_of_Measure: nGy/h (nanogray/hour)
    Attribute:
      Attribute_Label: Spec256_DOWN
      Attribute_Definition: radiometric spectrum; present in the GDB file, but not the XYZ file.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: The radiometric spectrum for each sample point is in the form of an array.
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: gpr2014-2_gridsasGRD_2gridsizes_NAD27_z5N.zip, gpr2014-2gridsasERS_2gridsizes _NAD27_z5N.zip
      Entity_Type_Definition:
        The two zip files mentioned above each contain 21 original and 21 resampled grids and appropriate supporting files for this publication. Both Geosoft binary float (GRD) and ER Mapper (ERS) formats are provided. All grids are in NAD27 datum, UTM Zone 5N. The original gridding was done with an 80 or 100 m cell size, and have been resampled to 25 m cell size. The cell size is included at the end of each grid name.
        Both cell sizes are included to provide more data than is available from the maps, GeoTIFFs, and KMZs produced from the 25 m grids. The apparent resistivity maps are most affected. Rugged terrane caused flying to be too high for accurate resolution of the apparent resistivity data. Resampling from 80 m to 25 m exacerbated the size of some of the blank areas.
        The 80 and 100 m cell-size grids are only included as grids. Grids can be viewed using downloadable free grid-viewing software from Geosoft or ER Mapper. More information is provided in the 'Technical Prerequisites' section of this metadata file.
        The Geosoft grid is contained in one file (GRD), but the ER Mapper grid consists of two files, a header file (.ERS) and a data file (no extension). Both ER Mapper files are necessary to view a grid or to convert it to another software format. Projection files (.GRD.GI and .ERS.GRD.GI) produced from Geosoft Oasis Montaj are provided for each Geosoft and ER Mapper grid file respectively. Placing these files in the same directory as the grids allows Oasis Montaj and ER Mapper to locate the grids geographically without manually assigning the projection.
      Entity_Type_Definition_Source: CGG
      Entity_Attribute_Layer_Name: GRIDS
    Attribute:
      Attribute_Label: Frl_MagRMI_80m
      Attribute_Definition: Original grid (80 m cell size) for residual magnetic field (nT). The IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_MagRMI_25m
      Attribute_Definition: Final grid of the residual magnetic field (nT) with IGRF removed; produced by resampling of the grid with 80 m cell size to grid with 25 m cell size. An image is shown in map numbers GPR2014-2-1 and 2, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_MagIGRF_80m
      Attribute_Definition: Original grid (80 m cell size) for 'total magnetic field (nT), with IGRF removed'; calculated by adding a constant to the 80 m residual magnetic field with IGRF removed (Frl_magRMI_80RMI); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_MagIGRF_25m
      Attribute_Definition: Final grid (25 m cell size) for total magnetic field (nT) - final, with IGRF removed; produced by resampling of the grid with 80 m cell size to grid with 25 m cell size. An image of this grid provided as a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_1VD_80m
      Attribute_Definition: Original grid for the first vertical derivative 'dz' (nT/m) of the total magnetic field with IGRF removed; also referred to as 'calculated vertical gradient' (cvg); 80 m cell size; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_1VD_25m
      Attribute_Definition: Final grid of the first vertical derivative 'dz' (nT/m) of the total magnetic field with IGRF removed; also referred to as 'calculated vertical gradient' (cvg). This grid was produced by resampling of the grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown in map number GPR2014-2-3, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ASig_80m
      Attribute_Definition: Original grid (80 m cell size) for the analytic signal (nT/m); calculated from the total magnetic field with IGRF removed; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ASig_25m
      Attribute_Definition: Final grid for the analytic signal (nT/m); produced by resampling the grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown in map numbers GPR2014-2-4 and 5, a GeoTIFF, and a KMZ. A color shadow image of this grid is shown in map number GPR2014-7.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_TiltDer_80m
      Attribute_Definition: Original grid (80 m cell size) for tilt derivative (degrees) of the total magnetic field with IGRF removed; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_TiltDer_25m
      Attribute_Definition: Final grid (25 m cell size) for tilt derivative (degrees) of the total magnetic field with IGRF removed; produced by resampling the grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown in map GPR2014-2-6, a GeoTIFF, and a KMZ. Contours produced from the 25 m tilt derivative grid are also shown upon a color shadow residual magnetic field image (Frl_MagRMI) in map GPR2014-2-7.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res56k_80m
      Attribute_Definition: Original grid (80 m cell size) produced for 56,000 (56k) Hz. apparent coplanar resistivity (ohm-m); calculated using a pseudo-layer half-space model; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res56k_25m
      Attribute_Definition: Final grid (25 m cell size) for 56,000 (56k) Hz. apparent coplanar resistivity (ohm-m); produced by resampling the grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown in map numbers GPR2014-2-8 and 9, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res7200_80m
      Attribute_Definition: Original grid (80 m cell size) for 7200 Hz. apparent coplanar resistivity (ohm-m); calculated using a pseudo-layer half-space model; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res7200_25m
      Attribute_Definition: Final grid (25 m cell size) for 7200 Hz. apparent coplanar resistivity (ohm-m); produced by resampling grid with 80 m cell size to grid with 25 m cell size. An image from the grid is shown in map numbers GPR2014-2-10 and 11, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res900_80m
      Attribute_Definition: Original grid (80 m cell size) for 900 Hz. apparent coplanar resistivity (ohm-m); calculated using a pseudo-layer half-space model; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Res900_25m
      Attribute_Definition: Final grid (25 m cell size) for 900 Hz. apparent coplanar resistivity (ohm-m); produced by resampling grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown in map numbers GPR2014-2-12 and 13, a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_DTM_80m
      Attribute_Definition: Original grid (80 m cell size) for digital terrain or elevation model (m); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_DTM_25m
      Attribute_Definition: Final grid (25 m cell size) for digital terrain or elevation model (m); produced by resampling grid with 80 m cell size to grid with 25 m cell size. An image of this grid is shown as a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_AltLasBird_80
      Attribute_Definition: Original grid (80 m cell size) for EM bird height (m) above surface, measured by laser altimeter in EM bird; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_AltLasBird_25
      Attribute_Definition: Final grid (25 m cell size) for EM bird height (m) above surface; produced by resampling grid with 80 m cell size to grid with 25 m cell size. An image of the final grid is shown as a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_K_cc_100m
      Attribute_Definition: Original grid (100 m cell size) for corrected thorium counts (cps); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_K_cc_25m
      Attribute_Definition: Final grid for corrected thorium counts (cps); produced by resampling grid with 100 m cell size to grid with 25 m cell size; an image shown in a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Th_cc_100m
      Attribute_Definition: Original grid (100 m cell size) for corrected thorium counts (cps); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_Th_cc_25m
      Attribute_Definition: Final grid (25 m cell size) for corrected thorium counts (cps); produced by resampling grid with 100 m cell size to grid with 25 m cell size; an image shown in a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_U_cc_100m
      Attribute_Definition: Original grid (100 m cell size) for corrected uranium counts (cps); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_U_cc_25m
      Attribute_Definition: Final grid (25 m cell size) for corrected uranium counts (cps); produced by resampling grid with 100 m cell size to grid with 25 m cell size; an image shown in a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_TC_cc_100m
      Attribute_Definition: Original grid (100 m cell size) for corrected total counts (cps); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_TC_cc_25m
      Attribute_Definition: Final grid (25 m cell size) for corrected total counts (cps); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eTh_pK_100m
      Attribute_Definition: Original grid (100 m cell size) for equivalent thorium/percent potassium ratio (ppm/%); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eTh_pK_25m
      Attribute_Definition: Final grid (25 m cell size) for equivalent thorium/percent potassium ratio (ppm/%); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-14 and 15, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eU_percentK_100m
      Attribute_Definition: Original grid (100 m cell size) for equivalent uranium/percent potassium ratio (ppm/%); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eU_percentK_25m
      Attribute_Definition: Final grid (25 m cell size) for equivalent uranium/percent potassium ratio (ppm/%); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-16 and 17, a GeoTIFF and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eU_eTh_100m
      Attribute_Definition: Original grid (100 m cell size) for equivalent uranium/equivalent thorium ratio (unitless); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_ratio_eU_eTh_25m
      Attribute_Definition: Final grid (25 m cell size) for equivalent uranium/equivalent thorium ratio (unitless); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-18 and 19, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_percentK_100m
      Attribute_Definition: Original grid (100 m cell size) for percent potassium (%); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_percentK_25m
      Attribute_Definition: Final grid (25 m cell size) for percent potassium (%); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-20 and 21, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_eTh_100m
      Attribute_Definition: Original grid (100 m cell size) for equivalent thorium (ppm); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_eTh_25m
      Attribute_Definition: Final grid (25 m cell size) for equivalent thorium (ppm); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-22 and 23, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_eU_100m
      Attribute_Definition: Original grid (100 m cell size) for equivalent uranium (ppm); provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_eU_25m
      Attribute_Definition: Final grid (25 m cell size) produced for equivalent uranium (ppm); produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-24 and 25, a GeoTIFF, and a KMZ.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_nadr_100m
      Attribute_Definition: Original grid (100 m cell size) for natural air absorbed dose rate [nGy/h (nanogray per hour)]; provided only as a grid.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
    Attribute:
      Attribute_Label: Frl_nadr_25m
      Attribute_Definition: Final grid (25 m cell size) for  natural air absorbed dose rate [nGy/h (nanogray per hour)]; produced by resampling grid with 100 m cell size to grid with 25 m cell size. An image of this grid is shown in maps GPR2014-2-26 and 27.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: Grid file
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GPR2014-2_GEOTIFFS_NAD27_z5N.zip and GPR2014-2_KMZS_WGS84
      Entity_Type_Definition:
        An image from each of the 21 grids with 25 m cell size is represented in GeoTIFF (TIF) and KMZ formats. An image from each of the 3 resistivity grids with 80 m cell size are also provided as GeoTIFFs and KMZs for comparison of the blank areas between the 25 m grids and the 80 m grids. Because definitions are the same for the GeoTIFFs and KMZs, they are discussed together.
        The zip file 'GPR2014-2_GEOTIFFS_NAD27_z5N.zip' contains GeoTIFFs in NAD27, UTM Zone 5N. The zip file 'GPR2014-2KMZS_WGS84.zip' contains Google Earth KMZ files in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. The GeoTIFFs and the Google Earth KMZs will automatically open in the correct projection in a GIS program or Google Earth respectively.
      Entity_Type_Definition_Source: CGG
      Entity_Attribute_Layer_Name: GEOTIFFS and KMZS
    Attribute:
      Attribute_Label: Frl_MagRMI
      Attribute_Definition: Residual magnetic field (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled. The same image is shown in map numbers GPR2014-2-1 and 2.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_MagIGRF
      Attribute_Definition: Total magnetic field (nT) - final, with IGRF removed; residual magnetic field (Mag_RMI) with constant added back in. Not produced as a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_1VD
      Attribute_Definition: First vertical derivative 'dz' ( nT/m) of the total magnetic field with IGRF removed; also referred to as 'calculated vertical gradient' (cvg). The same image is shown in map number GPR2014-2-3.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_ASig
      Attribute_Definition: Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed. The same image is shown in map numbers GPR2014-2-4 and 5.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF file
    Attribute:
      Attribute_Label: Frl_TiltDer
      Attribute_Definition: Tilt derivative (degrees) of the total magnetic field with IGRF removed. The same image is shown in map number GPR2014-2-6.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res56k
      Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz.; calculated using a pseudo-layer half-space model. The same image is shown in map numbers GPR2014-2-8 and 9.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res56k_80m
      Attribute_Definition: An image from the 80 m cell size apparent coplanar resistivity (ohm-m) grid for 56,000 (56k) Hz. calculated using a pseudo-layer half-space model. Image not shown on a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res7200
      Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 7200 Hz.; calculated using a pseudo-layer half-space model. The same image is shown in map numbers GPR2014-2-10 and 11.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res7200_80m
      Attribute_Definition: An image from the 80 m cell size apparent coplanar resistivity (ohm-m) grid for 7200 Hz. calculated using a pseudo-layer half-space model. Image not shown on a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res900
      Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 900 Hz.; calculated using a pseudo-layer half-space model. The same image is shown in map numbers GPR2014-2-12 and 13.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Res900_80m
      Attribute_Definition: An image from the 80 m cell size apparent coplanar resistivity (ohm-m) grid for 900 Hz. calculated using a pseudo-layer half-space model. Image not shown on a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_DTM
      Attribute_Definition: Digital terrain or elevation model (m). Not shown as a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_AltLasBird
      Attribute_Definition: EM bird height (m) above surface, measured by laser altimeter in EM bird. Not shown as a map.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_K_cc
      Attribute_Definition: Corrected potassium counts (cps); no map produced.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_Th_cc
      Attribute_Definition: Corrected thorium counts (cps); no map produced.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_U_cc
      Attribute_Definition: Corrected uranium counts (cps); no map produced.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_TC_cc
      Attribute_Definition: Corrected total counts (cps); no map produced.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_ratio_eTh_percentK
      Attribute_Definition: Equivalent thorium/percent potassium ratio (ppm/%). Map numbers GPR2014-2-14 and 15.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_ratio_eU_percentK
      Attribute_Definition: Equivalent uranium/percent potassium ratio (ppm/%). Map numbers GPR2014-2-16 and 17.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_ratio_eU_eTh
      Attribute_Definition: Equivalent uranium/equivalent thorium ratio (unitless). Map numbers GPR2014-2-18 and 19.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_percentK
      Attribute_Definition: Percent potassium (%). Map numbers GPR2014-2-20 and 21.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_eTh
      Attribute_Definition: Equivalent thorium (ppm). Map numbers GPR2014-2-22 and 23.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_eU
      Attribute_Definition: Equivalent uranium (ppm). Map numbers GPR2014-2-24 and 25.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_nadr
      Attribute_Definition: Natural air absorbed dose rate [nGy/h (nanogray per hour)]. Map numbers GPR2014-2-26 and 27.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
    Attribute:
      Attribute_Label: Frl_ternary
      Attribute_Definition: Radiometric ternary image; percent K = x axis (horizontal); equivalent Th = y axis (perpendicular horizontal axis shown at an angle), and equivalent U = z axis (vertical). Map number GPR2014-2-28.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: GeoTIFF, KMZ
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GPR2014-2_VECTORS.zip
      Entity_Type_Definition:
        Data contours produced for the maps are provided in Autocad DXF and ESRI shape file format. Except for maps GPR2014-2-6 and GPR2014-2-7, the vector files are shown on the maps without topography. Caution should be used when reading the contour labels from the shape and dxf files as they may appear to be with a different line. Additional vector files included are the flight path, the Alaska Section Grid, and a UTM grid for the map area.
        > Each file format (DXF and shape file) contains the same information. A dxf file (e.g. Frl_magRMI.dxf) contains the information in layers within the file, and the shape file format consists of each layer as a separate file (e.g. Frl_magRMI_1, Frl_magRMI_2, Frl_magRMI_3, and Frl_magRMI_4). Most sets of shape files in this publication consist of the numbers 1-4 or 1-5. Please refer to the map legends for appropriate line widths and particular label placement.
        > Neither the DXF nor the shape files are attributed. All labeling is done through individual alphanumeric characters, e.g. line number 3050 would be represented by 4 individual characters instead of one number.
      Entity_Type_Definition_Source: CGG
      Entity_Attribute_Layer_Name: VECTORS
    Attribute:
      Attribute_Label: Frl_magRMI
      Attribute_Definition: Contours, "triangles" denoting lows, and labels for residual magnetic field data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_ASig
      Attribute_Definition: Contours and labels for the analytic signal data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_TiltDer
      Attribute_Definition: Contours and labels for the magnetic tilt derivative data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_Res56k
      Attribute_Definition: Contours and labels for the 56,000 Hz coplanar apparent resistivity data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_Res7200
      Attribute_Definition: Contours and labels for the 7200 Hz coplanar apparent resistivity data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_Res900
      Attribute_Definition: Contours and labelsfor the 900 Hz coplanar apparent resistivity data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_percentK
      Attribute_Definition: Contours and labels for percent potassium (%) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_eTh
      Attribute_Definition: Contours and labels for equivalent thorium (ppm) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_eU
      Attribute_Definition: Contours and labels for equivalent uranium (ppm) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_ratio_eTh_percentK
      Attribute_Definition: Contours and labels for equivalent thorium/percent potassium ratio (ppm/%) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_ratio_eU_percentK
      Attribute_Definition: Contours and labels for equivalent uranium/percent potassium ratio (ppm/%) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector vector file
    Attribute:
      Attribute_Label: Frl_ratio_eU_eTh
      Attribute_Definition: Contours and labels for equivalent uranium/equivalent thorium ratio (unitless) data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_nadr
      Attribute_Definition: Contours and labels for natural air absorbed dose rate [nGy/h (nanogray per hour)] data
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_FP
      Attribute_Definition: Flight, tie, and border lines, line and flight numbers, tics and labels for the survey lines flown.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file
    Attribute:
      Attribute_Label: Frl_SecGrid
      Attribute_Definition: Alaska PLSS Section Grid (original file name 'pls_section') for the map areas. Modified by CGG for line width, color, township and range numbers to use on the maps.
      Attribute_Definition_Source: Alaska Department of Natural Resources - Land Records Information Section; L.E. Burns, Division of Geological & Geophysical Surveys; and CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: vector file containing alphanumeric characters
    Attribute:
      Attribute_Label: Frl_UTMGrid
      Attribute_Definition: A UTM grid for the map area produced by CGG. Consists of non-alphanumeric characters placed to look like alphanumeric labels around the edges of the map sheets.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: file containing non-alphanumeric characters
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GPR2014-2_MapsAsPDFS.zip and GPR2014-2_MapsAsHPGL2.zip
      Entity_Type_Definition: Zip file names indicate the map numbers and format included in the zip file.
      Entity_Type_Definition_Source: CGG
      Entity_Attribute_Layer_Name: MAPS
    Attribute:
      Attribute_Label: GPR2014-2-1
      Attribute_Definition: Residual magnetic field with topography. In nanoteslas (nT).
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-2
      Attribute_Definition: Residual magnetic field (nT) and data contours. In nT.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-3
      Attribute_Definition: First vertical derivative with topography. In nT/m. Calculated from the residual magnetic field.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-4
      Attribute_Definition: Analytic signal with topography. In nT/m. Calculated from the residual magnetic field.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-5
      Attribute_Definition: Analytic signal with data contours. In nT/m. Calculated from the residual magnetic field.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-6
      Attribute_Definition: Tilt derivative with topography and data contours. In degrees. Calculated from residual magnetic field.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-7
      Attribute_Definition: Color shadow residual magnetic field with magnetic tilt derivative contours. Color in nT; contours in degrees.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-8
      Attribute_Definition: 56,000 Hz apparent coplanar resistivity with topography. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-9
      Attribute_Definition: 56,000 Hz apparent coplanar resistivity and data contours. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-10
      Attribute_Definition: 7200 Hz apparent coplanar resistivity with topography. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-11
      Attribute_Definition: 7200 Hz apparent coplanar resistivity and data contours. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-12
      Attribute_Definition: 900 Hz apparent coplanar resistivity with topography. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-13
      Attribute_Definition: 900 Hz apparent coplanar resistivity and data contours. In ohm m.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-14
      Attribute_Definition: Equivalent thorium/percent potassium (eTh/K) with topography. In ppm/%.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-15
      Attribute_Definition: Equivalent thorium/percent potassium (eTh/K) and data contours. In ppm/%.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-16
      Attribute_Definition: Uranium/potassium (eU/K) with topography. In ppm/%.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-17
      Attribute_Definition: Uranium/potassium (eU/K) and data contours. In ppm/%.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-18
      Attribute_Definition: Uranium/thorium (eU/eTh) with topography. Unitless.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-19
      Attribute_Definition: Uranium/thorium (eU/eTh) and data contours. Unitless.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-20
      Attribute_Definition: Potassium (K) with topography. In percent.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-21
      Attribute_Definition: Potassium (K) and data contours. In percent.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-22
      Attribute_Definition: Thorium (eTh) with topography. In ppm.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-23
      Attribute_Definition: Thorium (eTh) and data contours. In ppm.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-24
      Attribute_Definition: Uranium (eU) with topography. In ppm.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-25
      Attribute_Definition: Uranium (eU) and data contours. In ppm.
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-26
      Attribute_Definition: Natural air absorbed dose rate with topography. In nGy/h (nanogray per hour).
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-27
      Attribute_Definition: Natural air absorbed dose rate and data contours. In nGy/h (nanogray per hour).
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-28
      Attribute_Definition: Radioelement - Ternary with topography
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
    Attribute:
      Attribute_Label: GPR2014-2-29
      Attribute_Definition: Radioelement - Ternary with topography
      Attribute_Definition_Source: CGG
      Attribute_Domain_Values:
        Unrepresentable_Domain: map in PDF and HPGL/2 format
  Overview_Description:
    Entity_and_Attribute_Overview:
      The linedata were divided into two separate database files for easier downloading. Both files, 'Farewell_EM' and 'Farewell_RAD', contain the same line numbers, fids, and locational data so that the files can be easily merged if wanted by the user. 'Farewell_EM' contains magnetic and electromagnetic data, and 'Farewell_RAD', the radiometric data. Both of these files are provided in Geosoft binary GDB and ASCII XYZ formats. A text file ('Farewell_Linedata.txt') contains some of the linedata information included in this metadata document, but in normal ASCII text format. Farewell_Linedata.txt is included with each downloadable zip file. The 'XYZtoGDB.i0' files define the input fields to convert XYZ files to GDB files.
      Each linedata file contains raw and processed linedata, and related calculated fields. Missing data are represented with the dummy variable '*'. Each of the 503 flight lines or partial flight lines (e.g. Line 30011, referred to as 'LINE' attribute) is associated with a 'DATE' (e.g. 2012/09/24), a 'FLIGHT (number)' (e.g. 4018), and a particular multi-record set of data. Each record represents data acquisition from one spatial location in the flight line. A total of 3,746,037 records are present in each data file.
    Entity_and_Attribute_Detail_Citation: L.E. Burns, Division of Geological & Geophysical Surveys and Fugro Airborne Surveys
  Overview_Description:
    Entity_and_Attribute_Overview:
      Four map sheets, labeled A through D, are needed to cover the survey at a scale of 1:63,360. The map sheet divisions are shown in gpr2014-002_browsegraphic.pdf. Most geophysical images that were included in a map in this publication are placed on two sets of maps, one with topography and one with data contours and no topography.
      Maps are provided in PDF and HPGL/2 format, and are downloadable in zip files by data format. The HPGL/2 maps and the Adobe Acrobat format maps are each divided into four  files with the range of map numbers included at the end of the file name. The HPGL/2 files have brighter and more gradational colors, and sharper topography than the Adobe Acrobat files. See 'Technical_Prerequisites' section for more information on printing HPGL/2 maps.
      >
      Authors and titles of the maps are like the example given below:
      >
      Burns, L.E., CGG, and Fugro GeoServices, Inc., 2013, Residual magnetic field with topography, Farewell Survey area, south-central Alaska, parts of the McGrath and Lime Hills quadrangles: Alaska Division of Geological & Geophysical Surveys Geophysical Report 2014-2-1A, 1 sheet, scale 1:63,360.
    Entity_and_Attribute_Detail_Citation: L.E. Burns, Division of Geological & Geophysical Surveys, and CGG
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Alaska Division of Geological & Geophysical Surveys
      Contact_Address:
        Address_Type: mailing and physical
        Address: 3354 College Road
        City: Fairbanks
        State_or_Province: AK
        Postal_Code: 99709-3707
        Country: USA
      Contact_Voice_Telephone: (907)451-5020
      Contact_Facsimile_Telephone: (907)451-5050
      Contact_Electronic_Mail_Address: dggspubs@alaska.gov
      Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
      Contact_Instructions: Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  Resource_Description: GPR 2014-2
  Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  Standard_Order_Process:
    Non-digital_Form: Current geophysics publications are available on paper or Mylar. Please ask for the maps to be printed from HPGL/2 files to ensure the best quality image. To purchase printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: cash, check, money order, VISA, or MasterCard.
    Fees: Contact DGGS for current pricing
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Geosoft binary float (GRD)
        Format_Version_Number: Unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ER Mapper (ERS)
        Format_Version_Number: Unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Geosoft binary database (GDB)
        Format_Version_Number: Unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Geosoft ASCII database (XYZ)
        Format_Version_Number: Unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ESRI Shape (SHP)
        Format_Version_Number: Unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Autocad DXF
        Format_Version_Number: 2000
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: GeoTIFF
        Format_Version_Number: unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Google KMZ
        Format_Version_Number: unknown
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: PDF
        Format_Version_Number: 1.5
      Digital_Transfer_Option:
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: HPGL/2
        Format_Version_Number: unknown
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://dx.doi.org/10.14509/27291
        Offline_Option:
          Offline_Media: DVD
          Recording_Format: Unspecified
    Fees: Digital files on DVD are available for $10 plus shipping and are free when downloaded online.
    Ordering_Instructions: Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: cash, check, money order, VISA, or MasterCard. The geophysics page of the DGGS web site (http://www.dggs.alaska.gov/pubs/geophysics) has geophysical order forms for this project and others.
  Technical_Prerequisites: Software with ability to use, import, or convert Geosoft float GRD, Geosoft binary GDB or ASCII XYZ files, Autocad DXF files, ESRI Shape files, Adobe Acrobat PDF, Google Earth files, and text files. Free downloadable interfaces to view or convert the gridded and dxf files are available at the Geosoft Web site (http://www.geosoft.com; Oasis Montaj viewer). The KMZ files can be dragged and dropped into the 'My Places' folder of the free downloadable 'Google Earth' software. Freeware software 'printfile' (http://www.lerup.com/printfile/) prints HPGL/2 files easily on compatible printers. The HPGL/2 files have brighter colors and sharper topography than the PDF maps and should be used for printing when possible. Unfortunately, Postscript printers and plotters turn the HPGL/2 files into a format like PDF, and thus decrease the color vitality and the sharpness. The PDF format maps are the only maps digitally viewable in this publication.
Metadata_Reference_Information:
  Metadata_Date: 20150403
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Alaska Division of Geological & Geophysical Surveys
      Contact_Position: Metadata Manager
      Contact_Address:
        Address_Type: mailing and physical
        Address: 3354 College Road
        City: Fairbanks
        State_or_Province: AK
        Postal_Code: 99709-3707
        Country: USA
      Contact_Voice_Telephone: (907)451-5020
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.
  Metadata_Extensions:
    Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext
    Profile_Name: dggs metadata extensions