Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey

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Frequently anticipated questions:


What does this data set describe?

Title:
Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey
Abstract:
The Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey covers parts of the Big Delta and Eagle quadrangles northeast of Delta Junction, Alaska. Magnetic and radiometric data were collected with a helicopter July 4-25, 2020 by MPX Geophysics LTD. A total of 10,100 line kilometers were collected over approximately 2,600 square kilometers. The magnetometer was mounted to a forward-facing fixed boom (stinger). The radiometric crystals were located in the cabin of the helicopter. Data were collected in eight named blocks. Mertie Mountains, Shaw Creek, and Volkmar River have a line spacing of 400 meters (m) and a mean ground clearance of 130 m. Stoneboy has a line spacing of 200 m and a mean ground clearance of 80 m. Eagle, Echo, Healy, and LMS-X have a line spacing of 100 m and a mean ground clearance of 80 m. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30551.
Supplemental_Information:
ascii_data:    ASCII format line data, other ASCII data	
databases_geosoft:    Geosoft format database of line data, other Geosoft format databases	
documents:    Project and field reports, survey background information, gridded data explanations, other supporting documentation	
grids_ermapper:    Geographically registered gridded data, ER Mapper ERS format	
grids_geosoft:    Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft	
images_registered:    GeoTiff format images of all gridded data	
kmz:    Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs	
maps_geosoft_format:    Maps as Geosoft packed map files	
maps_jpg_format:    Printable maps jpg format	
maps_pdf_format:    Printable maps in pdf format	
photos_flightpath:    Survey flight path downward facing photos with GPS location in exif data. Contact DGGS for availability.	
vector_data:    Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
  1. How might this data set be cited?
    Emond, A.M., and LTD, MPX Geophysics, 2020, Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey: Geophysical Report GPR 2020-16, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -157.817428
    East_Bounding_Coordinate: -154.598616
    North_Bounding_Coordinate: 62.665410
    South_Bounding_Coordinate: 60.825744
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters
      The horizontal datum used is World Geodetic System of 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563000025.
  7. How does the data set describe geographic features?
    ascii_data
    ASCII format line data, other ASCII data (Source: Clark Jorgensen)
    databases_geosoft
    Geosoft format database of line data, other Geosoft format databases (Source: Clark Jorgensen)
    documents
    Project and field reports, survey background information, gridded data explanations, other supporting documentation (Source: Clark Jorgensen and Alaska Division of Geological & Geophysical Surveys (DGGS))
    grids_ermapper
    Geographically registered gridded data, ER Mapper ERS format (Source: Clark Jorgensen and Alaska Division of Geological & Geophysical Surveys (DGGS))
    grids_geosoft
    Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft (Source: Clark Jorgensen and Alaska Division of Geological & Geophysical Surveys (DGGS))
    images_registered
    GeoTiff format images of all gridded data (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    kmz
    Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    maps_geosoft_format
    maps as Geosoft packed map files (Source: Clark Jorgensen)
    maps_jpg_format
    Printable maps jpg format (Source: Clark Jorgensen)
    maps_pdf_format
    Printable maps in pdf format (Source: Clark Jorgensen)
    photos_flightpath
    Survey flight path downward facing photos with GPS location in exif data. Contact DGGS for availability. (Source: Clark Jorgensen)
    vector_data
    Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    This work was supported by State of Alaska designated general funds as part of DGGS' FY2020 operating budget, and by industry partners Northern Star (Pogo) LLC, Millrock Resources Inc., and Northway Resources Corp.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

Why was the data set created?

The data from the Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey will be used for guiding geologic mapping, promoting resource exploration, generating mineral exploration targets, and be a part of the continuous regional magnetic data coverage of the Yukon Tanana Uplands. Portions of these blocks were collected over existing airborne geophysical data. These portions were collected to improve the magnetic data quality and resolution in these areas to support mineral exploration and targeting.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2020 (process 1 of 2)
    Data collection, processing, reporting - Magnetic and radiometric data were collected with a helicopter July 4-25, 2020 by MPX Geophysics LTD. Airborne geophysical data for the areas were acquired and processed by MPX Geophysics Ltd. The contractor's project report and other supporting documents are in the 'documents' digital data package. They provide detailed documentation of the system specifications, data collection, processing, and delivery. Preliminary files released Aug 2020.
    Date: 2021 (process 2 of 2)
    Data cataloged for archival and publication - All files were renamed and placed in a standardized set of folders according to the DGGS Geophysics Data Management Manual. DGGS generated additional supporting documentation, which includes readme text files, maps, figures, survey overview report, and FGDC compliant metadata. Preliminary data were removed from the DGGS website and replaced with reorganized data and comprehensive documentation.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Geophysical data were acquired according to the contractor, contract, and request-for-proposals specifications. For additional detail about survey parameters, see the accompanying project report available in the documents directory of this data distribution package.
  2. How accurate are the geographic locations?
    These data are positioned with post-processed differential GPS. Discussion of grid resolution and factors that may impact the overall horizontal accuracy of the gridded data is available in the documents directory of this data distribution package.
  3. How accurate are the heights or depths?
    Not applicable
  4. Where are the gaps in the data? What is missing?
    This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area.
  5. How consistent are the relationships among the observations, including topology?
    Data originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set? GPR 2020-16
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Jan-2021
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.50 on Wed Jan 06 18:46:45 2021