Identification_Information: Citation: Citation_Information: Originator: Burns, L.E. Originator: CGG Originator: Fugro GeoServices, Inc. Publication_Date: 2014 Title: Wrangellia survey area: Airborne magnetic and electromagnetic data in line (point), grid, vector, and map formats, Talkeetna Mountains, Healy, and Mt. Hayes quadrangles, south-central Alaska Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, and vector digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2014-1 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD, scale 1:63,360. Online_Linkage: http://dx.doi.org/10.14509/27022 Online_Linkage: http://www.dggs.alaska.gov/pubs/gpdata/256 Description: Abstract: This digital publication, GPR 2014-1, contains data produced from airborne geophysical surveys conducted in 2013 for the Talkeetna Mountains, Healy, and Mt. Hayes quadrangles in south-central Alaska. The area is in the Valdez Creek and Delta River mining districts. Aeromagnetic and electromagnetic (EM) data were acquired by helicopter for about 1310 sq miles, and additional data donated by Millrock Exploration Corporation, Anchorage, increased coverage by about 12 sq miles. Millrock also provided some infill flight lines for over a similar amount of sq miles. CGG acquired and processed all the airborne geophysical data. The data were all flown with the same systems and contract specifications. CGG's frequency-domain DIGHEM V system was used for the EM data. GPR 2014-1 includes (1) raw and processed linedata; (2) gridded, Google Earth, and Geotiff formats of the calculated linedata; (3) maps of the data and flight lines; (4) vector files of data contours and flight lines. Supporting files include gpr2014_001_readme.txt, Wrangellia_Linedata.txt, gpr2014_001_browsegraphic.pdf, and individual jpgs of some of the items in the browsegraphic file. Purpose: 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. Supplemental_Information: The airborne data were acquired and processed under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and Fugro GeoServices, Inc. CGG, the subcontractor, acquired and processed the data in 2013. A future publication will include the technical project report, interpretation map, and EM anomalies, as well as other files. This metadata file lists file names and definitions in the 'Entity_and_Attribute_Information' section. This information is also provided in the file 'gpr2014_001_readme.pdf'. Besides file names and definitions, the readme file contains map numbers and grid correlations, projection information, and much general information. Some detailed information about the data is given in the 'Entity_and_Attribute_Information' section of this metadata file. Page-sized location figures and images of the data are provided in the gpr2014_001_browsegraphic.pdf file, and as jpegs on the DVD version and through each download. The file 'Wrangellia_001_linedata.txt' gives information on the linedata in an easy-to-read format. All data are provided in NAD27, UTM zone 6N, except for Google Earth KMZ files, which are in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. Besides NAD27, UTM zone 6N easting and northing coordinates, the linedata files also include latitude and longitude (Geographic Coordinate System with a WGS84 datum). Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 201306 Ending_Date: 201401 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.71 East_Bounding_Coordinate: -146.12 North_Bounding_Coordinate: 63.37 South_Bounding_Coordinate: 62.57 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Aeromagnetic Data Theme_Keyword: Aeromagnetic Map Theme_Keyword: Aeromagnetic Survey Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Apparent Resistivity Data Theme_Keyword: Apparent Resistivity Map Theme_Keyword: Digital Elevation Model Theme_Keyword: DIGHEM V EM System Theme_Keyword: Electromagnetic Data Theme_Keyword: Electromagnetic Survey Theme_Keyword: First Vertical Derivative Theme_Keyword: Geophysics Theme_Keyword: HEM Survey Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics Place: Place_Keyword_Thesaurus: none Place_Keyword: Alaska, State of Place_Keyword: Delta River Mining District Place_Keyword: Healy Quadrangle Place_Keyword: Mount Hayes Quadrangle Place_Keyword: Talkeetna Mountains Quadrangle Place_Keyword: Valdez Creek Mining District 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. Browse_Graphic: Browse_Graphic_File_Name: gpr2014_001_browsegraphic.pdf Browse_Graphic_File_Description: The browse graphic file contains three location maps showing: 1) survey area and adjacent published surveys within Alaska, 2) detailed location diagram showing the survey area and adjacent surveys, 3) detailed diagram showing map sheets at 1:63,360-scale, and location of the area partially donated by Millrock; 4) diagram showing flight directions over the three major survey blocks, and 5) several page-sized images of data. Browse_Graphic_File_Type: PDF Data_Set_Credit: Funding was provided by the Alaska State Legislature through the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. A donation of data from Millrock Exploration Corporation, Anchorage, AK, provided increased resolution of some of the area and increased coverage by about 12 sq miles. Native_Data_Set_Environment: Microsoft Windows 7 Professional Version 2009 Service Pack 1; Geosoft Oasis Montaj Version 7.2; Autocad R14 and 2014 Map3D Version 2000; ESRI Shape file format; MapInfo Professional file format; ER Mapper; Adobe Acrobat Distiller v9.0; Adobe Acrobat Professional v9.0; Global Mapper v13.2; CGG proprietary software Cross_Reference: Citation_Information: Originator: DGGS Staff Originator: Dighem Originator: WGM, Inc. Publication_Date: 1998 Title: CD-ROM containing profile and gridded data and section lines of the 1997 geophysical survey data for Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, vector digital data Series_Information: Series_Name: Public Data File Issue_Identification: PDF 98-9 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/1822 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/11 Cross_Reference: Citation_Information: Originator: Burns, L.E. Originator: U.S. Bureau of Land Management Corp. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2003 Title: Line, grid, and vector data of airborne geophysical survey data for the southern Delta River area, east-central Alaska Geospatial_Data_Presentation_Form: raster digital data, tabular digital data, vector digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2003-6 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/2973 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/20 Cross_Reference: Citation_Information: Originator: Burns, L.E. Originator: U.S. Bureau of Land Management Corp. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2003 Title: Plot files of the airborne geophysical survey data of the southern Delta River area, east-central Alaska Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2003-5 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/2904 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/20 Cross_Reference: Citation_Information: Originator: Pritchard, R.A. Publication_Date: 2003 Title: Project report of the airborne geophysical survey for the southern Delta River area, east-central Alaska Geospatial_Data_Presentation_Form: maps Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2003-7 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/2974 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/20 Cross_Reference: Citation_Information: Originator: Burns, L.E. Originator: U.S. Bureau of Land Management Corp. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2004 Title: Line, gridded, and vector data, and selected plot files of the airborne geophysical survey data of the Valdez Creek mining district, central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2004-3 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/3337 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/31 Cross_Reference: Citation_Information: Originator: McConnell, D.L. Publication_Date: 1994 Title: Final summary of 1993 airborne geophysical surveys of the Nome, Circle, Nyac, and Valdez Creek areas Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-36 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) Other_Citation_Details: 327 p., 4 sheets, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1662 Online_Linkage: http://dggs.alaska.gov/pubs/gpdata/31 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Survey contracts specified the conditions and specifications under which these data were collected. Altimeter, heading, lag, and frequent EM calibrations were done. More information will be available in the project report to be published in the future. Logical_Consistency_Report: Data for this survey were collected by a single subcontractor (CGG) who was responsible for collecting and processing the data. One helicopter, one EM system, and one airborne magnetometer were used. The data donated by Millrock Exploration Corporation was flown by CGG immediately after the DGGS survey was finished. CGG continued using the specifications and processing of the data that were used with the DGGS data. Operational frequencies for the EM system varied and are documented in 'Wrangellia_Linedata.txt'. Completeness_Report: The linedata file has missing values for the calculated apparent resistivity and apparent depth channels. These are due to an increased altitude that renders the calculations meaningless. More information is in 'Wrangellia__Linedata.txt'. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 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. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Akima, H. Publication_Date: 1970 Title: A new method of interpolation and smooth curve fitting based on local procedures Series_Information: Series_Name: Journal of the Association of Computing Machinery Issue_Identification: v. 7, no. 4 Online_Linkage: None Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1970 Source_Currentness_Reference: 1970 Source_Citation_Abbreviation: Akima, 1970 Source_Contribution: CGG used a modification of this method while making grids. Source_Information: Source_Citation: Citation_Information: Originator: Fraser, D.C. Publication_Date: 1978 Title: Resistivity mapping with an airborne multicoil electromagnetic system Series_Information: Series_Name: Geophysics Issue_Identification: v. 43 Online_Linkage: None Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1978 Source_Currentness_Reference: 1978 Source_Citation_Abbreviation: Fraser, 1978 Source_Contribution: CGG used this method for calculating apparent depth and apparent resistivity. Source_Information: Source_Citation: Citation_Information: Originator: Alaska Department of Natural Resources - Land Records Information Section Publication_Date: 1995 Title: Alaska PLSS Section Grid Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Anchorage, Alaska Publisher: State of Alaska, Department of Natural Resources, Division, Land Records Information Section (LRIS) Other_Citation_Details: ESRI shape file format Online_Linkage: http://mapper.landrecords.info/ Online_Linkage: http://dnr.alaska.gov/SpatialUtility/SUC?cmd=vmd&layerid=45 (metadata) Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1950 Ending_Date: 1998 Source_Currentness_Reference: 2008 Source_Citation_Abbreviation: ADNR-LRIS, 1995 Source_Contribution: The downloaded section grid file, built from original protraction diagram data, was used as a starting point for the section grid digital file included in GPR2014-1. Minor formatting modifications were made to the file. The section grid is used on the maps without topography and is provided in digital format in this publication. The ending date for content, given above, reflects the current metadata file for the Alaska PLSS Section Grid. Process_Step: Process_Description: The airborne geophysical data were acquired between June 15 to August 27, 2013 with a DIGHEM (V) Electromagnetic (EM) system and a Scintrex CS3 cesium magnetometer sensor. The EM and magnetic sensors were flown at a height of 100 feet, with the magnetic sensor installed in the EM bird. In addition, the survey recorded data from radar and laser altimeters, GPS navigation system, 50/60 Hz monitors, and video camera. > Flights were performed with an Aerospatiale AS-350-B3 helicopter at a mean terrain clearance of 200 feet (61 m). Three flight directions were used for the Wrangellia survey in an attempt to remain perpendicular to the regional structural and geologic trends (Fig. 4). Survey flight lines were flown a heading of 135 (NW-SE) in the Block 2, the western part; 162 (NW-SE) in Block 3, the central part; and N-S for Blocks 4 and 1, the eastern part. Traverse lines were spaced at one-quarter mile (402.3 m) intervals for all the DGGS planned survey area. Millrock provided data flown with one-eighth mile flight lines for Block 1, which includes the far northern part and infill lines between existing DGGS flight lines for a small portion south of that area (see gpr2014_001_browsegraphic.pdf, figure 3). Tie lines were flown perpendicular to flight lines, and were spaced at intervals of approximately 3 miles (4,828 m). > A Novatel OEM5-G2L Global Positioning System was used for navigation and flight path recovery. The helicopter position was derived every 0.5 seconds (2 Hz); the ground GPS base station data were collected at 1.0 second (1 Hz) intervals. The use of the differentially-corrected base station data results in a positional accuracy of better than five meters. The positional xy data are interpolated from 2 Hz to 10 Hz. Flight path positions were projected onto the Clarke 1866 (UTM zone 6N) spheroid, 1927 North American datum using a central meridian (CM) of 147 degrees, a north constant of 0, and an east constant of 500,000. Process_Date: 2013 Process_Step: Process_Description: The total magnetic field data were acquired with a sampling interval of 0.1 seconds. Data are contained in channels in the linedata file 'Wrangellia'. The spike-rejected raw magnetic data (channel 'mag_raw') were (1) corrected for measured system lag (resulting in the channel 'mag_lag'), (2) corrected for diurnal variations by subtraction of the digitally recorded base station magnetic data (resulting in the channel 'mag_diu'), (3) adjusted for regional variations (by subtracting IGRF model 2010, updated for date of flight and elevation variations), (4) leveled to the tie line data resulting in the final residual magnetic intensity (resulting in channel 'mag_rmi'),(5) manually leveled with final small microleveling, and (6) increased by a constant IGRF average value to restore the mag_rmi values to a total magnetic field channel (resulting in channel 'magigrf'). 'Mag_RMI' and 'MagIGRF' were then interpolated onto a regular 80-m grid using a modified Akima (1970) technique. Source_Used_Citation_Abbreviation: Akima, 1970 Process_Date: 2013 Process_Step: Process_Description: Three different algorithms were applied to the total magnetic field 80 m grid, resulting in three magnetic derivative grids. The analytic signal grid (Wran_ASig) is the total amplitude of all directions of magnetic gradient calculated from the sum of the squares of the three orthogonal gradients. Mapped highs in the calculated analytic signal of the magnetic parameter locate the anomalous source body edges and corners (e.g., contacts, fault/shear zones, basement fault block boundaries or lithologic contacts, etc.). Analytic signal maxima are located directly over faults and contacts, regardless of structural dip, and independently of the direction of the induced and/or remanent body magnetizations. > The calculated magnetic tilt grid (Wran_TiltDer) is the angle between the horizontal gradient and the total vertical gradient, and is useful for identifying the depth and type of magnetic source. The tilt angle is positive over the source, crosses through zero at, or near, the edge of a vertical sided source, and is negative outside the source zone. It has the added advantage of responding equally well to shallow and deep sources and is able to resolve deeper sources that may be masked by larger responses caused by shallower sources. > The first vertical derivative grid was calculated using a fast Fourier transform (FFT) based frequency-domain filtering algorithm. The vertical gradient algorithm enhances the response of magnetic bodies in the upper 500 m and attenuates the response of deeper bodies. The resulting (calculated) vertical gradient grid (Wran_1VD) provides better definition and resolution of near-surface magnetic units and helps to identify weak magnetic features that may not be evident in the total field data. > All magnetic and derivative magnetic grids were then resampled from the 80-m cell size down to a 25-m cell size using a modified Akima (1970) technique to produce the maps and final grids contained in this publication. Source_Used_Citation_Abbreviation: Akima, 1970 Process_Date: 2013 Process_Step: Process_Description: The EM system measured inphase and quadrature components with two vertical coaxial-coil pairs (1000 and 5500 Hz), and three horizontal coplanar-coil pairs (900, 7200 and 56,000 Hz). See 'Wrangellia_Linedata.txt� for information about the operating frequencies. EM data were sampled at 0.1 second intervals. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The EM inphase and quadrature data were drift corrected using base level data collected at high altitude (areas of no signal). Along-line filters are applied to the data to remove spheric spikes. The data were inspected for variations in phase, and a phase correction was applied to the data if necessary. Apparent resistivities were then calculated from the inphase and quadrature data for all coplanar frequencies based on a pseudo-layer half-space model. Manual leveling of the inphase and quadrature of each coil pair, based on the resistivity data and comparisons to the data from the other frequencies, was performed. Automated micro-leveling is carried out in areas of low signal. The EM data were interpolated onto a regular 80-m grid using a modified Akima (1970) technique. The resulting grids were subjected to a 3x3 Hanning filter and resampled to a 25-m cell size before contouring and map production. Source_Used_Citation_Abbreviation: Akima, 1970 Process_Date: 2013 Process_Step: Process_Description: The digital elevation/terrain model was produced from the differentially corrected GPS-Z data (channel 'GPSZ' in linedata files) and the laser altimeter data measured in the bird (channel 'ALTLAS_BIRD' in linedata). Both the GPSZ and ALTLAS_BIRD data were checked for spikes, which were removed manually. The ALTLAS_BIRD data were despiked and then filtered using a 13 median filter, followed by a 13 Hanning filter. The corrected altimeter was then subtracted from the GPSZ data to produce profiles of the height above mean sea level along the survey lines. The data were manually leveled to remove any errors between lines. After all leveling, the data were DC shifted to match the local maps, in this case, NAD27. The 80-m DTM grid was then resampled to a 25-m cell size to produce the DTM grid contained in this publication. Process_Date: 2013 Process_Step: Process_Description: DGGS downloaded the Alaska PLSS Section Grid shapefile in December 2012 and cut the file to roughly fit the map sheets for this publication using MapInfo Professional. Fugro Airborne Surveys modified the formatting of the file using AutoCad, changing township and range line widths and colors, and added township and range labels. The modified file was then used as overlays on maps without topography. Source_Used_Citation_Abbreviation: ADNR-LRIS, 1995 Process_Date: 2013 Process_Step: Process_Description: The HPGL/2 files were created with HP Designjet T1300ps HPGL driver v61.132.2518.500 and plot on some plotters, but not all plotters correctly. The Adobe Acrobat format files were created with Adobe Acrobat Distiller v9.0 from Postscript files. Process_Date: 2014 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 6 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -147 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 25 Ordinate_Resolution: 25 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: grids Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: WrangelliaLinedataAsGDB_Part1.ZIP and WrangelliaLinedataAsGDB_Part2.ZIP Entity_Type_Definition: The linedata files contain raw and processed data and related calculated fields for locational, magnetic, and electromagnetic data. The linedata are provided in Geosoft binary GDB format, and are split into two parts to allow for easier downloading. The file labeled with 'Part1' contains data for Blocks 2 and 3; 'Part2' contains data for Blocks 4 and 1, as well as all of the tie and border line data (see 'gpr2014_001_browsegraphic.pdf', figure 3). Supporting information about the data is included in the file 'Wrangellia_Linedata.txt'. Entity_Type_Definition_Source: L.E. Burns & CGG Entity_Attribute_Layer_Name: linedata Attribute: Attribute_Label: ID_CELL Attribute_Definition: The 'ID CELL' occurs in the GDB file only; the contents of the 'ID CELL' are also present in the XYZ file. In the 'ID CELL' for this project, the 'LINE' attribute is followed by a colon followed by the 'FLIGHT' attribute (e.g., 'L20010:29003' and 'T29010:29086'). More than one line is typically flown on a particular date and flight; more than one flight may be flown on a particular date. The first digit of the 'LINE' attribute corresponds to the Block number. Each ID-cell value will have an associated spreadsheet view consisting of a column for each of the 50 attributes. In the XYZ file, the 'LINE' and 'FLIGHT' attributes and the 'DATE' are present as header lines, one attribute per line, before each set of associated data, for example: > //Flight 29003 > //Date 2013/06/30 > Line 20010 (or 'Tie 29010' instead of 'Line 20010' when appropriate) > Followed by all records for points sampled along Line 20010. > (Pattern is repeated for each line number). The 'ID CELL' content, particularly combined with the definitions below for this particular survey, provides information about the flight line layout. Attribute_Definition_Source: L.E. Burns & CGG Attribute_Domain_Values: Unrepresentable_Domain: Definitions of the 'FLIGHT' attributes are listed with the 'flight' attribute label below. Attribute: Attribute_Label: x_NAD27z6N Attribute_Definition: easting NAD 27 (UTM Zone 6) Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 414392.19 Range_Domain_Maximum: 545408.53 Attribute_Units_of_Measure: m Attribute: Attribute_Label: y_NAD27z6N Attribute_Definition: northing NAD 27 (UTM Zone 6) Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 6937667.50 Range_Domain_Maximum: 7027550.40 Attribute_Units_of_Measure: m Attribute: Attribute_Label: fid Attribute_Definition: Fiducial increment; the time in tenths of seconds from the start to the end of the particular flight. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: The attribute measurement resolution is 0.1 second. The values increase from the beginning of a flight to the end. Only FIDs during production flights are included in the database. Attribute: Attribute_Label: lat_WGS84 Attribute_Definition: latitude WGS 84 Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 62.5647087 Range_Domain_Maximum: 63.3774650 Attribute_Units_of_Measure: degrees Attribute: Attribute_Label: lon_WGS84 Attribute_Definition: longitude WGS 84 Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -148.6760665 Range_Domain_Maximum: -146.1032101 Attribute_Units_of_Measure: degrees Attribute: Attribute_Label: flight Attribute_Definition: The attribute 'flight' is actually a compound designator indicating the identification of the HeliDAS (Data Acquisition System), in this case '29', followed by 3 digits indicating the actual flight number. A flight number is the sequential numbering of the helicopter flight from home base to home base associated with a survey. These result in a 5 digit number, e.g. 29003. An exception has been made for the flights for Block 1, which was flown after DGGS Block 2, 3, and 4. Block 1 was considered a separate project by CGG and flight numbering was restarted at the beginning. To make the flight number unique for all the flights, a '1' was placed in front of the 5 digit number for Block 1. Only those flight numbers containing acquisition of final data measurements are included in the database. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: See 'Wrangellia_Linedata.txt' for more information. Attribute: Attribute_Label: date Attribute_Definition: range of flight dates (yyyy/mm/dd) for production flights of the survey Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2013/06/30 Range_Domain_Maximum: 2013/08/27 Attribute_Units_of_Measure: day Attribute: Attribute_Label: altrad_calcbird Attribute_Definition: calculated bird height above surface to simulate location of radar altimeter in the bird; radar altimeter measurement was recorded in helicopter. Altrad_calcbird was calculated by subtracting a constant, which represented distance in altitude from helicopter to the bird when towing and recording data. Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 11.34 Range_Domain_Maximum: 492.88 Attribute_Units_of_Measure: m Attribute: Attribute_Label: altlas_bird Attribute_Definition: bird height above surface, measured by laser altimeter in the EM bird Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 12.05 Range_Domain_Maximum: 564.07 Attribute_Units_of_Measure: m Attribute: Attribute_Label: gpsz Attribute_Definition: bird height above spheroid. The GPSZ (or GPS-Z) value is primarily dependent on the number of available satellites. Although post-processing of GPS data will yield X and Y accuracies on the order of 1 meter, the accuracy of the Z value is usually much less, sometimes in the +/-20 meter range. Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 512.15 Range_Domain_Maximum: 2196.41 Attribute_Units_of_Measure: m Attribute: Attribute_Label: dtm Attribute_Definition: digital terrain model (NAD27 UTM zone 6); calculated from channel 'GPS-Z' and the laser data (channel 'ALTLAS_BIRD') measured in the bird ' Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 472.32 Range_Domain_Maximum: 2166.88 Attribute_Units_of_Measure: m Attribute: Attribute_Label: diurnal_filt Attribute_Definition: measured diurnal ground magnetic intensity; interpolated to 0.1 sec. from 1.0 second measurements Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 55735.60 Range_Domain_Maximum: 56369.27 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: diurnal_cor Attribute_Definition: diurnal correction - base removed; calculated from interpolated diurnal_filt Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -495.4 Range_Domain_Maximum: 138.27 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: mag_raw Attribute_Definition: total magnetic field - spike rejected Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 54612.78 Range_Domain_Maximum: 62348.25 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: mag_lag Attribute_Definition: total magnetic field - corrected for lag Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 54613.87 Range_Domain_Maximum: 62348.25 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: mag_diu Attribute_Definition: total magnetic field - diurnal variation removed Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 54571.08 Range_Domain_Maximum: 62318.09 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: igrf Attribute_Definition: international geomagnetic reference field Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 56311.60 Range_Domain_Maximum: 56838.55 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: mag_rmi Attribute_Definition: residual magnetic intensity - IGRF removed, then leveled - final Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -2091.69 Range_Domain_Maximum: 5868.86 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: magigrf Attribute_Definition: total magnetic field with IGRF removed - mag_rmi with constant added back - final Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 54714.81 Range_Domain_Maximum: 62675.36 Attribute_Units_of_Measure: nT Attribute: Attribute_Label: cpi900_FILT Attribute_Definition: coplanar inphase 900 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -718.15 Range_Domain_Maximum: 1020.36 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq900_FILT Attribute_Definition: coplanar quadrature 900 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -18.78 Range_Domain_Maximum: 644.83 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxi1000_FILT Attribute_Definition: coaxial inphase 1000 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -198.57 Range_Domain_Maximum: 293.05 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxq1000_FILT Attribute_Definition: coaxial quadrature 1000 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -13.61 Range_Domain_Maximum: 175.95 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxi5500_FILT Attribute_Definition: coaxial inphase 5500 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -171.98 Range_Domain_Maximum: 384.65 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxq5500_FILT Attribute_Definition: coaxial quadrature 5500 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -28.10 Range_Domain_Maximum: 326.09 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpi7200_FILT Attribute_Definition: coplanar inphase 7200 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -485.75 Range_Domain_Maximum: 1244.62 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq7200_FILT Attribute_Definition: coplanar quadrature 7200 Hz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -106.08 Range_Domain_Maximum: 842.20 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpi56K_FILT Attribute_Definition: coplanar inphase 56 kHz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -320.14 Range_Domain_Maximum: 1712.89 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq56K_FILT Attribute_Definition: coplanar quadrature 56 kHz - unlevelled Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -108.41 Range_Domain_Maximum: 1214.21 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpi900 Attribute_Definition: coplanar inphase 900 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -718.34 Range_Domain_Maximum: 1027.93 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq900 Attribute_Definition: coplanar quadrature 900 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -3.40 Range_Domain_Maximum: 644.87 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxi1000 Attribute_Definition: coaxial inphase 1000 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -198.58 Range_Domain_Maximum: 289.59 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxq1000 Attribute_Definition: coaxial quadrature 1000 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.55 Range_Domain_Maximum: 175.92 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxi5500 Attribute_Definition: coaxial inphase 5500 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -174.26 Range_Domain_Maximum: 376.78 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cxq5500 Attribute_Definition: coaxial quadrature 5500 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -17.04 Range_Domain_Maximum: 328.98 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpi7200 Attribute_Definition: coplanar inphase 7200 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -485.81 Range_Domain_Maximum: 1244.59 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq7200 Attribute_Definition: coplanar quadrature 7200 Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.16 Range_Domain_Maximum: 842.18 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpi56k Attribute_Definition: coplanar inphase 56k Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -320.12 Range_Domain_Maximum: 1713.06 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: cpq56K Attribute_Definition: coplanar quadrature 56k Hz Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -2.00 Range_Domain_Maximum: 1227.30 Attribute_Units_of_Measure: ppm Attribute: Attribute_Label: res900 Attribute_Definition: apparent resistivity 900 Hz; cut-off value for apparent resistivity was 1325; more information in Process_Steps Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.89 Range_Domain_Maximum: 1325 Attribute_Units_of_Measure: ohm�m Attribute: Attribute_Label: res7200 Attribute_Definition: apparent resistivity 7200 Hz; cut-off value for apparent resistivity was 110750; more information in Process_Steps Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.33 Range_Domain_Maximum: 10750 Attribute_Units_of_Measure: ohm�m Attribute: Attribute_Label: res56K Attribute_Definition: apparent resistivity 56k Hz; cut-off value for apparent resistivity was 60000; more information in Process_Steps Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5.87 Range_Domain_Maximum: 60000 Attribute_Units_of_Measure: ohm�m Attribute: Attribute_Label: dep900 Attribute_Definition: apparent depth 900 Hz; more information in Process_Steps. Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -111.74 Range_Domain_Maximum: 291.99 Attribute_Units_of_Measure: m Attribute: Attribute_Label: dep7200 Attribute_Definition: apparent depth 7200 Hz; more information in Process_Steps. Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -119.06 Range_Domain_Maximum: 140.64 Attribute_Units_of_Measure: m Attribute: Attribute_Label: dep56K Attribute_Definition: apparent depth 56k Hz; more information in Process_Steps. Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -128.89 Range_Domain_Maximum: 114.23 Attribute_Units_of_Measure: m Attribute: Attribute_Label: difi Attribute_Definition: difference channel based on cxi5500 & cpi7200 Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -73.35 Range_Domain_Maximum: 154.78 Attribute_Units_of_Measure: unitless Attribute: Attribute_Label: difq Attribute_Definition: difference channel based on cxq5500 & cpq7200 Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -32.37 Range_Domain_Maximum: 203.45 Attribute_Units_of_Measure: unitless Attribute: Attribute_Label: cppl Attribute_Definition: coplanar powerline monitor Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 0.00 Attribute_Units_of_Measure: unitless Attribute: Attribute_Label: cxsp Attribute_Definition: coaxial spherics monitor Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 0.00 Attribute_Units_of_Measure: unitless Attribute: Attribute_Label: cpsp Attribute_Definition: coplanar spherics monitor Attribute_Definition_Source: CGG Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 0.00 Attribute_Units_of_Measure: unitless Detailed_Description: Entity_Type: Entity_Type_Label: gpr2014-1_GRIDSasERS_NAD27_z6N.zip, gpr2014-1_GRIDSasGRD_NAD27_z6N.zip, gpr2014-1_GEOTIFFS_NAD27_z6N.zip, and gpr2014-1_KMZS_WGS84.zip Entity_Type_Definition: These zip files contain the 10 grids, 10 geotiffs, and 9 KMZs for the Wrangellia area. Because definitions of the data in each are the same, they are combined in this section. Definitions are below the brief discussion of the different formats and their relationship to each other. A data image was made from each of the different 10 grid files and each data image is provided with corresponding color bar in the Geotiffs and KMZ files. The AltLasBird image is not shown as a KMZ file. One of the following seven data images, Wran_magRMI, Wran_1VD, Wran_Asig, Wran_TiltDer, Wran_res56k, Wran_res7200, and Wran_res900, are used on 13 of the 14 maps in this publication. Four sheets are needed for each map. In contrast, the images shown in the Geotiff or KMZ files show the entire survey area. The 14th map includes flight lines and no data images. The zip files gpr2014-1_GRIDSasGRD_NAD27_z6N.zip and gpr2014-1_GRIDSasERS_NAD27_z6N.zip contain the 10 grids and supporting files for this publication in either Geosoft binary float (GRD) format or ER Mapper (ERS) format. Each grid is in NAD27 datum, UTM Zone 6N, and has a 25m cell size with x and y in meters. The Geosoft grid is contained in one file (GRD), but the ER Mapper grid consists of two files, a header file (.ERS) and a data file (no extension). Both ER Mapper files are necessary to view a grid or to convert it to another software format. Projection files (.GRD.GI and .ERS.GRD.GI) produced from Geosoft Oasis Montaj are provided for each Geosoft and ER Mapper grid file respectively. Placing these files in the same directory as the grids allows Oasis Montaj and ER Mapper to locate the grids geographically without manually assigning the projection. The Geotiffs and the Google Earth KMZs will automatically open in the correct projection in a GIS program or Google Earth respectively. Entity_Type_Definition_Source: CGG Entity_Attribute_Layer_Name: grids, geotiffs, and kmzs Attribute: Attribute_Label: Wran_MagRMI Attribute_Definition: Residual magnetic field (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_MagIGRF Attribute_Definition: Total magnetic field (nT) - final, with IGRF removed; residual magnetic field (Mag_RMI) with constant added back in. Not produced as a map. Wran_RMI (also produced as maps) is directly the same as Wran_MagIGRF except off by a constant. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_1VD Attribute_Definition: First vertical derivative 'dz' (nT/m) of the total magnetic field with IGRF removed; also referred to as 'calculated vertical gradient' (cvg). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_ASig Attribute_Definition: Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_TiltDer Attribute_Definition: Tilt derivative (degrees) of the total magnetic field with IGRF removed. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_Res56k Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz.; calculated using a pseudo-layer half-space model. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_Res7200 Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 7200 Hz.; calculated using a pseudo-layer half-space model. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_Res900 Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 900 Hz.; calculated using a pseudo-layer half-space model. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_DTM Attribute_Definition: Digital terrain or elevation model (m). Not shown as a map. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file, KMZ file Attribute: Attribute_Label: Wran_AltLasBird Attribute_Definition: EM bird height (m) above surface, measured by Laser altimeter in EM bird. Not shown as a map. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: Grid file, Geotiff file Detailed_Description: Entity_Type: Entity_Type_Label: gpr2014-1_VECTORSasDXF_NAD27_z6N.zip and gpr2014-1_VECTORSasSHP_NAD27_z6N.zip Entity_Type_Definition: Data contours produced for the maps are provided in Autocad DXF and ESRI shape file format. Except for maps GPR 2014-1-6 and GPR2014-1-7, the vector files are shown on the maps without topography. Caution should be used when reading the contour labels from the shape and DXF files as they may appear to be with a different line. Additional vector files included are the flight path, the Alaska Section Grid, and a UTM grid for the map area. > Each file format (DXF and shape file) contains the same information. A DXF file (e.g. Wran_magRMI.dxf) contains the information in layers within the file, and the shape file format consists of each layer as a separate file (e.g. Wran_magRMI_1, Wran_magRMI_2, Wran_magRMI_3, and Wran_magRMI_4). Most sets of shape files in this publication contain up to 5 files. Please refer to the map legends for appropriate line widths and particular label placement. > Neither the DXF nor the shape files are attributed. All labeling is done through individual alphanumeric characters, e.g. line number 10050 would be represented by 5 individual characters instead of one number. Entity_Type_Definition_Source: CGG Entity_Attribute_Layer_Name: vectors Attribute: Attribute_Label: Wran_magRMI Attribute_Definition: Contours, "triangles" denoting direction of lower values, and labels for the residual magnetic field data Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_ASig Attribute_Definition: Contours and labels for the analytic signal data Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_TiltDer Attribute_Definition: Contours and labels for the magnetic tilt derivative data contours are provided at specific values to aid in interpretation of approximate contact location '0' contour), and depth to contact. Contours include the values -45, -30, -15, 0, +15, +30, and +45. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_Res56k Attribute_Definition: Contours and labels for the 56,000 Hz coplanar apparent resistivity data Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_Res7200 Attribute_Definition: Contours and labels for the 7200 Hz coplanar apparent resistivity data Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_Res900 Attribute_Definition: Contours and labels for the 900 Hz coplanar apparent resistivity data Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file Attribute: Attribute_Label: Wran_FP Attribute_Definition: Flight, tie, and border lines, line and flight numbers, tics and labels for the survey lines flown Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file containing lines for all flight lines Attribute: Attribute_Label: Wran_SecGrid Attribute_Definition: Alaska PLSS Section Grid (original file name 'pls_section') for the map areas. Modified by CGG for line width, color, township and range numbers to use on the maps. Attribute_Definition_Source: Alaska Department of Natural Resources - Land Records Information Section; L.E. Burns, Division of Geological & Geophysical Surveys; and CGG Attribute_Domain_Values: Unrepresentable_Domain: vector file containing alphanumeric characters Attribute: Attribute_Label: Wran_UTMGrid Attribute_Definition: A UTM grid for the map area produced by CGG. Consists of non-alphanumeric characters placed to look like alphanumeric labels around the edges of the map sheets. Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: file containing alphanumeric characters Detailed_Description: Entity_Type: Entity_Type_Label: gpr2014-1_MAPS_1A-7B_asPDF.zip, gpr2014-1_MAPS_7C-14D_asPDF.zip, gpr2014-1_MAPS_1A-7B_asHPGL2.zip, and gpr2014-1_MAPS_7C-14D_asHPGL2.zip Entity_Type_Definition: Zip file names indicate the map numbers and format included in the zip file. Entity_Type_Definition_Source: CGG Entity_Attribute_Layer_Name: maps Attribute: Attribute_Label: GPR2014-1-1A, B, C, and D Attribute_Definition: Residual magnetic field (nT) with IGRF removed (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-2A, B, C, and D Attribute_Definition: Residual magnetic field (nT) with IGRF removed (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-3A, B, C, and D Attribute_Definition: First vertical derivative (nT/m) of the total magnetic field with IGRF removed (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-4A, B, C, and D Attribute_Definition: Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-5A, B, C, and D Attribute_Definition: Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-6A, B, C, and D Attribute_Definition: Tilt derivative (degrees) of the total magnetic field with IGRF removed (includes data contours and topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-7A, B, C, and D Attribute_Definition: Shadowed residual magnetic field (nT with IGRF removed with tilt derivative contours (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-8A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz. (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-9A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz. (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-10A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 7200 Hz. (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-11A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 7200 Hz. (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-12A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 900 Hz. (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-13A, B, C, and D Attribute_Definition: Apparent coplanar resistivity (ohm-m) for 900 Hz. (includes data contours). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Attribute: Attribute_Label: GPR2014-1-14A, B, C, and D Attribute_Definition: Flight lines (includes topography). Attribute_Definition_Source: CGG Attribute_Domain_Values: Unrepresentable_Domain: map in PDF and HPGL/2 format Overview_Description: Entity_and_Attribute_Overview: Maps are provided in PDF and HPGL/2 format, and are downloadable in zip files by data format. Both the PDF and the HPGL/2 maps are split into two downloads to minimize download size. The range of map numbers is included at the end of the file name. The HPGL/2 files have brighter and more gradational colors, and sharper topography than the Adobe Acrobat files. See 'Technical_Prerequisites' section for more information on printing HPGL/2 maps. > Fourteen maps are included for the area. All maps in this publication are at a scale of 1:63,360 (inch-to-a-mile). Four map sheets are needed to cover the survey area. Figure 2 of the file gpr2014-1-001_graphic.pdf shows the location of Sheets A through D. Entity_and_Attribute_Detail_Citation: L.E. Burns, Division of Geological & Geophysical Surveys, and CGG 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: GPR 2014-1 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 binary float (GRD) Format_Version_Number: Unknown Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: ER Mapper (ERS) Format_Version_Number: Unknown Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft binary database (GDB) Format_Version_Number: Unknown Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft ASCII (XYZ) Format_Version_Number: Unknown Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: ESRI Shape (SHP) Format_Version_Number: Unknown Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: PDF Format_Version_Number: 1.5 Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Digital_Form: Digital_Transfer_Information: Format_Name: HPGL/2 Format_Version_Number: unknown Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/27022 Offline_Option: Offline_Media: DVD Recording_Format: Unspecified Fees: Digital files on DVD are available for $10 plus shipping and are free when downloaded online. Ordering_Instructions: Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: cash, check, money order, VISA, or MasterCard. The geophysics page of the DGGS web site (http://www.dggs.alaska.gov/pubs/geophysics) has geophysical order forms for this project and others. Turnaround: Digital downloads: less than 30 minutes for most files. Free FTP access is available upon request for files not available on the web. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid. Custom_Order_Process: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter, by mail, phone, fax, or email from the DGGS Fairbanks office. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for exact shipping amount. Technical_Prerequisites: Software with ability to use, import, or convert Geosoft float GRD, Geosoft binary GDB or ASCII XYZ files, Autocad DXF files, ESRI Shape files, MapInfo Professional TAB 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. Metadata_Reference_Information: Metadata_Date: 20140130 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_Time_Convention: local time Metadata_Access_Constraints: none 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