FAREWELL: (McGrath and Lime Hills quadrangles) West_Bounding_Coordinate: -154.54 East_Bounding_Coordinate: -152.99 North_Bounding_Coordinate: 62.52 South_Bounding_Coordinate: 61.86 MIDDLE STYX: (Lime Hills and Tyonek quadrangles) West_Bounding_Coordinate: -153.46 East_Bounding_Coordinate: -152.97 North_Bounding_Coordinate: 61.98 South_Bounding_Coordinate: 61.74
CGG, and Fugro GeoServices, Inc., 2015, Farewell and Middle Styx survey areas: Project report, interpretation maps, EM anomalies, stacked multi-channel profiles, and other products of the airborne geophysical surveys, parts of the McGrath, Lime Hills, and Tyonek quadrangles, south-central Alaska: Geophysical Report GPR 2014-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.01
Ordinates (y-coordinates) are specified to the nearest 0.01
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
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. Cook Inlet Region, Inc. (CIRI) contributed funding for a portion of the area.
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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.
CGG, Unpublished material, original raw and processed data, vector files, and test results for the Middle Styx survey area.
CGG, Unpublished material, original raw and processed data, vector files, and test results for the Farewell survey area.
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
Burns, L.E., CGG, and Fugro GeoServices, Inc., 2014, 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: Geophysical Report GPR 2014-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Burns, L.E., Fugro Airborne Surveys Corp., and Fugro GeoServices, Inc., 2013, 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: Geophysical Report GPR 2013-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2008, Line, grid, and vector data, and plot files for the airborne geophysical survey of the Styx River Survey, southcentral Alaska: Geophysical Report GPR 2008-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Burns, L.E., CGG, and Fugro GeoServices, Inc., 2014, East Styx survey area: Airborne magnetic, electromagnetic and radiometric data in line (point), grid, vector, and map formats, Talkeetna, Tyonek, McGrath, and Lime Hills quadrangles, south-central Alaska: Geophysical Report GPR 2014-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Survey interpretation and documentation of data acquisition and tests done during acquisition were produced by the same company (CGG) who acquired the data. Tests completed and constraints used are documented in the project report. Ruth Pritchard, the project report author and data interpreter, has several decades of experience interpreting aeromagnetic and electromagnetic data and making EM anomaly picks.
Accuracy of the data was discussed in the metadata for the first publications for Middle Styx (GPR2013-2) and Farewell (GPR 2014-2) surveys (listed in the cross references). The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m.
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.
The data are complete.
N/A
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.
(907)451-5020 (voice)
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dggspubs@alaska.gov
GPR 2014-4
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.
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.
Data format: | Geosoft ASCII (XYZ), ASCII text files (including CSV), GeoTiff, Google KMZ, Autocad DXF, ESRI shapefile, Adobe PDF |
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Network links: |
<http://dx.doi.org/10.14509/29349> |
Digital files on DVD are available for $10 plus shipping and are free when downloaded online.
Software with ability to use, import, or convert Geosoft binary GDB or Geosoft 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. The PDF format maps are the only maps digitally viewable in this publication.
(907)451-5020 (voice)