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 Tanacross, Ladue, Western Fortymile, and Fortymile geophysical surveys. The grids were compiled by Benjamin Drenth (USGS). The data, as well as additional metadata, are available from the Alaska Division of Geological & Geophysical Surveys website: http://dggs.alaska.gov/pubs/id/29555 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: >taylor_mountain: 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 Zone 7 - NAD83 and Geographic WGS84 projections. The data files were compiled from the Tanacross, Ladue, Western Fortymile, and Fortymile geophysical surveys. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1998 Ending_Date: 2015 Currentness_Reference: ground condition Status: Progress: planned Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -143.802754 East_Bounding_Coordinate: -141.001038 North_Bounding_Coordinate: 64.475904 South_Bounding_Coordinate: 63.612919 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: Electromagnetic Data Theme_Keyword: Electromagnetic Survey Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Gridded Data Theme_Keyword: Magnetic Data Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics 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, Bureau of Land Management, and the USGS Mineral Resources Program. 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., Geoterrex-Dighem, and Goldak Airborne Surveys Inc. Funding to perform the data merge was provided by the USGS Mineral Resources Program. The grids were compiled by Benjamin Drenth (USGS). 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: 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 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: Burns, L.E. Originator: U.S. Bureau of Land Management Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2008 Title: Line, grid, and vector data, plot files, and descriptive project report for the airborne geophysical survey of part of the western Fortymile mining district, east-central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2008-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 9 sheets, 1 DVD Online_Linkage: http://dx.doi.org/10.14509/15961 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2008 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2008 Source_Contribution: gridded data Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: Saltus, R.W. Originator: Graham, Gina Originator: Goldak Airborne Surveys Publication_Date: 2015 Title: Airborne magnetic geophysical survey of the Tanacross region, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/29514 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 Process_Step: Process_Description: Gridded data - This data merge was performed by Ben Drenth of the USGS in 2016. Magnetic data from parts of the Tanacross (2015), Ladue (2010), Western Fortymile (2007), and Fortymile (1998) surveys were merged. The Tanacross survey is a fixed wing magnetic data survey. The other surveys are helicopter electromagnetic and magnetic surveys optimized for frequency domain electromagnetic data collection. All data have the IGRF removed based on the dates of data acquisition. Before merging these data together all helicopter data were upward continued to 350 meters ground clearance. The Tanacross survey was upward or downward continued to 350 meters ground clearance from actual flight height before merging. All data sets were levelled using overlapping data points prior to merging. Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2011 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2008 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2015 Process_Date: 2016 Process_Step: Process_Description: Boundary - DGGS staff constructed a boundary of the merged grid file. The grid 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 Process_Step: Process_Description: GeoTiff files - DGGS staff created GeoTiff files using Geosoft Oasis montaj. 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 1983 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: taylor_mountain 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 Zone 7 - NAD83 and Geographic WGS84 projections. The data files were compiled from the Tanacross, Ladue, Western Fortymile, and Fortymile geophysical surveys. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and contractor. Entity_Attribute_Layer_Name: taylor_mountain 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 Zone 7 - NAD83 and Geographic WGS84 projections. The data files were compiled from the Tanacross, Ladue, Western Fortymile, 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