Identification_Information: Citation: Citation_Information: Originator: DGGS Staff Publication_Date: 2016 Title: Alaska merged geophysical data grids Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: Digital Data Series Issue_Identification: DDS 12 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/29555 Description: Abstract: Merged grids of residual magnetic intensity, digital terrain model, and apparent resistivity compiled from the Tok, Ladue, Slate Creek - Slana River, Alaska Highway Corridor, and Fortymile geophysical surveys. Purpose: This electromagnetic and magnetic airborne geophysical survey data compilation is a product of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project. The goal of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program is to enhance the understanding of Alaska's mineral resources and stimulate private-sector mineral development. The program seeks to delineate 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 Alaskans; and (3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. Candidate lands for this program are identified on the basis of existing geologic knowledge, land ownership, and nominations from Alaska's geologic community. The AGGMI program and resulting new geologic knowledge are recognized worldwide and have encouraged millions of dollars of venture capital expenditures in the local economies of the surveyed mining districts. These venture capital expenditures have led to discovery and delineation of new mineral resources. The multi-year Strategic and Critical Minerals Assessment Capital Improvement Project (SCMA) was established to determine Alaska's geologic potential for rare-earth elements and other minerals that are essential for our modern, technology-based society. This program began in FY2012 with a data survey and compilation of existing information on rare-earth-element occurrences in Alaska, and expanded significantly in FY2013 to include additional critical minerals, re-analyses of existing samples, and obtaining new field and analytical data, including airborne geophysics. Supplemental_Information: >tok_lad_scsr_ahc_40mi: Geosoft-format binary grids, GeoTiff format gridded data images, KMZ/KML files, Geosoft ASCII polygon files (PLY), Geosoft ASCII zone files, ESRI Shapefiles; note: these data are provided in both UTM NAD27 and Geographic WGS84 projections. The data files were compiled from the Tok, Ladue, Slate Creek - Slana River, Alaska Highway Corridor, and Fortymile geophysical surveys. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1998 Ending_Date: 2014 Currentness_Reference: ground condition Status: Progress: planned Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -145.59524 East_Bounding_Coordinate: -140.84782 North_Bounding_Coordinate: 64.47524 South_Bounding_Coordinate: 62.39953 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Gridded Data Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska, State of 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Geophysics Staff 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_Electronic_Mail_Address: dggsgis@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: Funding for the originating geophysical surveys was provided by the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and Strategic and Critical Minerals Assessment Capital Improvement Project. The geophysical surveys were managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The survey data were collected and processed by CGG, Fugro Airborne Surveys Corp., and Geoterrex-Dighem. Cross_Reference: Citation_Information: Originator: Geological Survey of Canada Originator: U.S. Geological Survey Publication_Date: 2015 Title: Yukon - Eastern Alaska magnetic grid Publication_Information: Publication_Place: Canada Publisher: Natural Resources Canada Online_Linkage: http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?productid=1587 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: All originating data met contract specifications with a few exceptions due to difficult operational conditions. These exceptions did not noticeably impact data quality. Additional detail about contract specifications and operational issues can be found in the metadata of the originating surveys. Logical_Consistency_Report: These data originate from multiple similar geophysical surveys with different specifications. Reference the metadata of each originating survey for exact specifications. Completeness_Report: Helicopter and fixed wing geophysical surveys often have small data gaps that do not negatively impact the overall quality of the final products. Reference the metadata for each originating survey for specific details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: All originating data were positioned by DGPS with an accuracy of 5 meters or better. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2006 Title: Line, grid, and vector data, and plot files for the airborne geophysical survey of the Alaska Highway corridor, east-central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2006-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/14864 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2006 Source_Contribution: gridded data Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2009 Title: Line, grid, and vector data, and maps for the airborne geophysical survey of the Slate Creek-Slana River Survey, Chistochina mining district, south-central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2009-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 18 sheets, 1 DVD, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/19621 Source_Scale_Denominator: 63360 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2009 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2009 Source_Contribution: gridded data Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Originator: Emond, A.M. Originator: Graham, G.R.C. Publication_Date: 2015 Title: Fortymile mining district electromagnetic and magnetic airborne geophysical survey, data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/29411 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Contribution: gridded data Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: CGG Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: CGG Land (US) Inc. Publication_Date: 2015 Title: Tok electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/29347 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Contribution: gridded data Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Fugro GeoServices, Inc. Publication_Date: 2011 Title: Ladue survey area: Magnetic and electromagnetic line, grid, and vector data and Maps, Fortymile mining district, Tanacross Quadrangle, eastern Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2011-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 26 sheets, 1 DVD, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/22562 Source_Scale_Denominator: 63360 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2011 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2011 Source_Contribution: gridded data Process_Step: Process_Description: Gridded data - The gridded data from the Tok survey area (flown in 2014) were merged with data from previous surveys, the Fortymile survey block, flown in 1998, the Alaska Highway corridor survey, flown in 2005 and 2006, the Slana survey area, flown in 2008, and the Ladue Area, flown in 2010. The merges were completed using proprietary CGG ATLAS software techniques. ATLAS has the capability to merge or stitch numerous grids together. The process requires overlap between adjacent grid areas. There is also the option of selecting different grid stitch techniques. For this project the RMI and DTM grids were levelled to each other prior to merging. All parameters were merged together using a systematic technique. This method uses polynomial correction up to order 4 to the input grids and the base (preferred or primary grid). The coefficients are calculated using the overlapping area of all grids. Each of the grids is adjusted systematically for a fit with the preferred (base) grid and also for a fit with respect to each other. The process requires selecting a "master" grid or the grid that all other grids will be levelled to. The grid from the most recent survey was selected as the primary grid. Because the RMI and DTM grids were levelled to each other prior to merging, the simplest option of no datum shift of the grids was used. The nature of the resistivity parameter requires no levelling of the grids to each other before using the no datum shift option for final merging. The gridded data for the 2008 Slana survey were originally displayed in NAD27 Alaska, UTM Zone 6N. The data were re-projected into NAD27 Alaska, UTM Zone 7N using Oasis Montaj software before merging with the rest of the survey areas. A merge of the residual magnetic data was possible for all areas. DTM data were not available for the Fortymile survey block, therefore the DTM data were only merged with the Alaska Highway corridor, Slana and Ladue survey data. Because the electromagnetic data were collected using the DIGHEM system for Ladue, and the RESOLVE system for the Alaska Highway corridor survey, only one 'common' frequency existed between the two datasets. A merged grid of the 7200 Hz resistivity data from the Ladue block, and the 8200 resistivity data from the corridor survey was produced. When the Ladue data was merged in 2011 with the Fortymile survey data, although both the Ladue and Fortymile surveys were flown with the DIGHEM system, the resistivity data for the two surveys were not merged. In the time since the Fortymile survey was flown in 1998, acquisition and processing methods have changed and improved to the point where the Fortymile resistivity data would have had to undergo some re-processing in order to merge with the resistivity parameters from the Ladue survey. This was not within the scope of the Ladue contract, and no attempt was made to merge the Fortymile resistivity data. The merged resistivity data, therefore, consists of the previously merged Ladue/Alaska Highway corridor 7200/8200 Hz resistivity grid merged with the re-projected Slana 7200 Hz resistivity data and the present Tok 7200 Hz resistivity data. The resistivity for the Slana area was recalculated with higher upper limits of apparent resistivity, which are now used in processing more recent datasets. Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2006 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2009 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2011 Process_Date: 2011 Process_Step: Process_Description: Boundary - DGGS staff constructed a boundary of the merged grid file. The gid boundary was constructed using Geosoft Oaisis montaj grid outline and map export functions. The boundary file is available in Geosft PLY ASCII format and ESRI Shapefile format. Process_Date: 2015 Process_Step: Process_Description: Google Earth KMZ files - DGGS staff created Google Earth KMZ/KML files from the grid files data using ESRI ArcGIS software. Process_Date: 2016 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 7 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -141 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 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: 294.9786982 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: tok_lad_scsr_ahc_40mi Entity_Type_Definition: Geosoft-format binary grids, GeoTiff format gridded data images, KMZ/KML files, Geosoft ASCII polygon files (PLY), Geosoft ASCII zone files, ESRI Shapefiles; note: these data are provided in both UTM NAD27 and Geographic WGS84 projections. The data files were compiled from the Tok, Ladue, Slate Creek - Slana River, Alaska Highway Corridor, and Fortymile geophysical surveys. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and contractor. Entity_Attribute_Layer_Name: tok_lad_scsr_ahc_40mi 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: DDS 12 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-format binary grids, GeoTiff format gridded data images, KMZ/KML files, Geosoft ASCII polygon files (PLY), Geosoft ASCII zone files, ESRI Shapefiles; note: these data are provided in both UTM NAD27 and Geographic WGS84 projections. The data files were compiled from the Tok, Ladue, Slate Creek - Slana River, Alaska Highway Corridor, and Fortymile geophysical surveys. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/29555 Fees: Digital files on DVD are available for $10 plus shipping and are free when downloaded online. Metadata_Reference_Information: Metadata_Date: 20160224 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