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

Dataset Identification:

Resource Abstract:
This digital publication, GPR 2008-1, contains geophysical data and a digital elevation model that were produced from airborne geophysical surveys conducted in 2007 for part of the western Fortymile mining district, east-central Alaska. Aeromagnetic and electromagnetic data were acquired for 250 sq miles during the helicopter-based survey. Data provided in GPR 2008-1 include processed (1) linedata ASCII database, (2) gridded files of magnetic data, a calculated vertical magnetic gradient (first vertical derivative), apparent resistivity data, and a digital elevation model, (3) vector files of data contours and flight lines, and (4) the Contractor's descriptive project report. Data are described in more detail in the "GPR2008-1Readme.pdf" and "linedata/GPR2008-1-Linedata.txt" files included on the DVD.
Citation
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
publication  Date   2008-01-01
presentationForm  RASTER DIGITAL DATA, TABULAR DIGITAL DATA, VECTOR DIGITAL DATA, AND ATLAS
Series
Name Geophysical Report
Issue GPR 2008-1
other Citation Details  1 DVD
cited responsible party - publisher
organisation Name  State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
Contact information
Address
, Fairbanks, AK, USA
cited responsible party - originator
organisation Name  Burns, L.E.
cited responsible party - originator
organisation Name  U.S. Bureau of Land Management
cited responsible party - originator
organisation Name  Fugro Airborne Surveys Corp.
cited responsible party - originator
organisation Name  Stevens Exploration Management Corp.
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
URL: http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=geophysics
Topic Category:  geoscientificInformation
Keywords:
Theme keywords (theme):
Aeromagnetic Data
Aeromagnetic Map
Airborne Geophysical Survey
Apparent Resistivity Data
Apparent Resistivity Map
Apparent Resistivity Contours
Digital Elevation Model
DIGHEM V EM System
Electromagnetic Data
First Vertical Derivative
Geophysics
HEM Survey
Magnetic Contours
thesaurus name >
Title none
Location keywords:
Alaska, State of
Eagle Quadrangle
Fortymile Mining District
Tanacross Quadrangle
thesaurus name >
Title none
purpose:
The survey was funded by the U.S. Department of Interior, Bureau of Land Management in support of the State of Alaska's Airborne Geophysical/Geological Mineral Inventory project. The data were produced to provide information for mineral resource evaluation and land management decisions.
Resource language:  eng; USA
Resource progress code:  completed
Resource Maintenance Information
maintenance or update frequency:  notPlanned
Constraints on resource usage:
Constraints
Use limitation statement:
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.
Constraints on resource usage:
Legal Constraints
use constraint:  otherRestrictions
Other constraints
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. 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 (DGGS).
Constraints on resource usage:
Legal Constraints
Access Constraints  otherRestrictions
Other constraints
Access Constraints: This report, map and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Processing environment:  Native Dataset Environment: Microsoft Windows XP Professional Version 2002 Service Pack 2; Geosoft Oasis Montaj Version 6.3; Autocad Version 2000; ER Mapper 6.3, HP Designjet 5000 or 5500 plotters, HP plotters that can read Postscript 3, and Adobe Acrobat PDF writer Version 7.0 Technical Prerequisites: Software with ability to use, import, or convert Geosoft .grd or ER Mapper .ers files, Geosoft .xyz (ASCII) files, Autocad .dxf files, Adobe Acrobat files, and text files. Free downloadable interfaces for accessing the gridded and dxf files are available at the Geosoft Web site (http://www.geosoft.com; Oasis Montaj viewer), and the ER Mapper Web site (http://www.ermapper.com). Maps are accessed digitally using Adobe Acrobat. Maps are printed from the HPGL/2 files using HP 5000 series plotters or the Adobe Acrobat files. The HPGL/2 files will provide the clearest hard copy versions. "Printfile" (http://www.lerup.com/printfile/) is a freeware MS Windows utility program that will enable you to print HPGL/2 files; the plotter will still need to be compatible with files produced for the HP 5000 series.
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude  -143.39
eastBoundLongitude  -142.61
northBoundLatitude  64.36
southBoundLatitude  63.95
Temporal Extent
2007-09-01 2007-12-01
Additional information on resource:
The maps were compiled and drawn under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and Stevens Exploration Management Corp. Airborne geophysical data for the area were acquired and processed by Fugro Airborne Surveys in 2007. This publication also contains HPGL2 and Adobe Acrobat files for all maps produced to date for this project. All maps included on this publication are full color. Authors for the individual maps are the same as for this publication. The maps on GPR 2008-1 include: GPR 2008-1-1a - Total magnetic field of part of the western Fortymile mining district, east-central Alaska; topography included; scale 1:63,360, 1 sheet. GPR 2008-1-1b - Total magnetic field of part of the western Fortymile mining district, east-central Alaska; magnetic data contours included; scale 1:63,360, 1 sheet. GPR 2008-1-1c - First vertical derivative of the total magnetic field of part of the western Fortymile mining district, east-central Alaska; topography included; scale 1:63,360, 1 sheet. GPR 2008-1-2a - 56,000 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; topography included; scale 1:63,360, 1 sheet. GPR 2008-1-2b - 56,000 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; 56,000 Hz resistivity data contours included; scale 1:63,360, 1 sheet. GPR 2008-1-3a - 7200 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; topography included; scale 1:63,360, 1 sheet. GPR 2008-1-3b - 7200 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; 7200 Hz resistivity data contours included; scale 1:63,360, 1 sheet. GPR 2008-1-4a - 900 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; topography included; scale 1:63,360, 1 sheet. GPR 2008-1-4b - 900 Hz coplanar apparent resistivity of part of the western Fortymile mining district, east-central Alaska; 900 Hz resistivity data contours included; scale 1:63,360, 1 sheet. An index map showing the locations of the 1:63,360-scale map sheets are included on this publication. Bounding coordinates for the sheets are given immediately below. The bounding coordinates of the gridded data are given in the "Bounding_Coordinates" section below. 1:63,360-scale maps, sheet 1 West, -143.42 1:63,360-scale maps, sheet 1 East, -142.58 1:63,360-scale maps, sheet 1 North, 64.38 1:63,360-scale maps, sheet 1 South, 63.92
Credits:
The U.S. Bureau of Land Management provided funding for the 2007 geophysical data and project management.
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Content information: feature catalog description

Included With Dataset  false
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Scope of quality information
scope level  dataset
Resource lineage description
source
source description  Source Contribution: Fugro Airborne Surveys used a modification of this method while making grids.Source Type paper
source citation
Title A new method of interpolation and smooth curve fitting based on local procedures
publication  Date   1970-01-01
Series
Name Journal of the Association of Computing Machinery
Issue v. 7, no. 4
cited responsible party - originator
organisation Name  Akima, H.
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
URL: None
Resource extent
Temporal Extent
1970-01-01
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description  The helicopter position was derived every 0.5 seconds using post-flight differential positioning to a relative accuracy of better than 5 m. Positional accuracy of the presented data is better than 10 m with respect to the UTM grid. Further inaccuracies may be introduced by the interpolation and gridding process.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description  The accuracy of the elevation calculation used for the digital elevation model is directly dependent on the accuracy of the two input parameters, ALTR and HMSL. The ALTR value may be erroneous in areas of heavy tree cover, where the altimeter reflects the distance to the tree canopy rather than the ground. The HMSL (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 in the order of 5 meters, the accuracy of the Z value is usually much less, sometimes in the +/-20 meter range.
Completeness Commission
evaluation Method Description  This dataset includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the survey area.
Completeness Omission
evaluation Method Description  This dataset includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the survey area.
ConceptualConsistency
measure Description  No topological relationships are included.

Resource distribution information

Distributor
distributor contact - distributor
organisation Name  State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
position Name Natural Resource Technician
Contact information
Telephone
Voice 907-451-5020
Fax 907-451-5050
Address
3354 College Road, Fairbanks, AK, 99709-3707 Country USA
electronic Mail Address dggspubs@alaska.gov
hoursOfService 8 am to 4:30 pm, Monday through Friday, except State holidays
contact Instructions
Please view our Web site (http://www.dggs.dnr.state.ak.us) for the latest information on available data. Please contact us using the e-mail address above whenever possible.
Standard ordering process
fees Variable
Standard ordering process
fees Digital files on DVD are available for $15 plus shipping; currently, only the maps can be downloaded from our web site (http://www.dggs.dnr.state.ak.us) and are in PDF format. No fees charged for downloaded files.
Ordering Instructions  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.dnr.state.ak.us/pubs/pubs?reqtype=geophysics) has geophysical order forms for this project and others. Payment accepted: Cash, check, money order, VISA, or MasterCard. Custom Order Process: Custom views or processing may be requested. Please contact Laurel Burns by phone (907-451-5021), e-mail (laurel.burns@alaska.gov), or fax (907-451-5050) to discuss custom processing availability, fees, and turnaround time.
turnaround
Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.
Format
Format name Geosoft binary float (GRD)
Format version Unknown
Format
Format name ER Mapper binary (ERS)
Format version Unknown
Format
Format name Geosoft ASCII (XYZ)
Format version Unknown
Format
Format name DXF
Format version 2000
Format
Format name HPGL/2 (PRN)
Format version Unknown
Format
Format name PDF
Format version 1.3
Format
Format name Postscript (PS)
Format version Unknown
Digital Transfer Options
Linkage for online resource
URL: http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=geophysics
Digital Transfer Options
Medium of distribution
name  dvd
medium Format  ISO9660 OR JOLIET ISO9660 OR JOLIET ISO9660 OR JOLIET ISO9660 OR JOLIET ISO9660 OR JOLIET ISO9660 OR JOLIET ISO9660 OR JOLIET

Metadata data stamp:  2008-05-06
Resource Maintenance Information
date of next update:  9999-01-01
maintenance or update frequency:  annually
notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
notes: Last Metadata Review Date: 2008-05-06
Metadata Constraints
Legal Constraints
Access Constraints  otherRestrictions
Other constraints
Metadata Access Constraints: none
Metadata Constraints
Legal Constraints
Access Constraints  otherRestrictions
Other constraints
Metadata Use Constraints: If the user has modified the data in any way the user is obligated to describe the types of modifications the user has made in the supporting metadata file. User specifically agrees not to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.
Metadata contact - pointOfContact
organisation Name  State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
position Name Geophysicist
Contact information
Telephone
Voice 907-451-5021
Fax 907-451-5050
Address
3354 College Road, Fairbanks, AK, 99709-3707 Country USA
electronic Mail Address dggspubs@alaska.gov
hoursOfService 8 am to 4:30 pm, Monday through Friday, except State holidays.
contact Instructions
Please contact us through the e-mail address above whenever possible.
Metadata scope code  dataset
Metadata language  eng; USA
Metadata character set encoding:   utf8
Metadata standard for this record:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
standard version:  ISO 19115-2:2009(E)
Metadata record identifier:  993c3537-7e55-4e39-b40c-e6931ee60145

Metadata record format is ISO19139-2 XML (MI_Metadata)