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_pdf_format: Printable maps in pdf format maps_prn_format: Printable maps in HPGL/2 printer file format with extension .prn profiles_stacked: Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols vector_data: Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
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Funding was provided by the Alaska State Legislature for the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.
The 1998 Fortymile airborne electromagnetic and magnetic geophysical survey and this compilation are part of the Alaska Airborne Geophysical/Geological Mineral Inventory project funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The project seeks to catalyze private-sector mineral development investment. 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. This purpose for this publication is to compile and upgrade key digital data into a single publication for online data distribution.
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Apparent resistivity cutoffs: 900 Hz coplanar apparent resistivity cutoff 1008 Ohm-m 7200 Hz coplanar apparent resistivity cutoff 8250 Ohm-m Electromagnetic system sensitivity: Frequency; Coil Orientation; Sensitivity (ppm) 900 Hz horizontal coplanar 0.06 1000 Hz vertical coaxial 0.06 5500 Hz vertical coaxial 0.10 7200 Hz horizontal coplanar 0.10 56,000 Hz horizontal coplanar 0.30 Magnetic system sensitivity: 0.01 nT
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.
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.
| Data format: | DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ |
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| Network links: |
http://dx.doi.org/10.14509/29411 |
Requisite software varies according to the file format. Possible software requirements include, but are not limited to: Geosoft Oasis montaj (full version and viewer), INTREPID geophysical software, ESRI Arc GIS products, MapInfo, Global Mapper, UltraEdit, NotePad ++, Microsoft Office or open source office software, Adobe Reader, Lerup PrintFile, Google Earth, ER Mapper