Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation

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Frequently anticipated questions:

What does this data set describe?
Who produced the data set?
Why was the data set created?
How was the data set created?
How reliable are the data; what problems remain in the data set?
How can someone get a copy of the data set?
Who wrote the metadata?

What does this data set describe?

Title:

Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation

Abstract:

The Ketchikan geophysical survey is located in southeast Alaska in the Ketchikan area, about 350 kilometers south of Juneau, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system from February to April 1999. A total of 4750.8 line kilometers were collected covering 1648.6 square kilometers. Line spacing was 400 meters (m). Data were collected approximately 30 m above the ground cover or tree canopy from a helicopter-towed sensor platform ('bird') on a 30-m-long line. The large trees and steep terrain resulted in an average ground clearance of 150 m. In the original 1999 release the Ketchikan survey was merged with data from several adjacent surveys (Kasaan, Hetta, and Dolomi). Map sheets and some of the other files in this data release contain data from adjacent or nearby surveys. The data, as well as additional metadata, are available from the DGGS website: <http://doi.org/10.14509/30430>.

Supplemental_Information:

ascii_data:    ASCII format line data, other ASCII data	
databases_geosoft:    Geosoft format database of line data, other Geosoft format databases	
documents:    Project and field reports, survey background information, gridded data explanations, other supporting documentation	
grids_ermapper:    Geographically registered gridded data, ER Mapper ERS format	
grids_geosoft:    Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft	
images_registered:    GeoTiff format images of all gridded data	
kmz:    Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs	
maps_pdf_format:    Printable maps in pdf format	
maps_prn_format:    Printable maps in HPGL/2 printer file format with extension .prn	
profiles_stacked:    Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols	
vector_data:    Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format

How should this data set be cited?
Burns, L.E., Graham, G.R.C., Barefoot, J.D., Geoterrex-Dighem, and WGM Mining and Geological Consultants, Inc., 2020, Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation: Geophysical Report GPR 2020-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/30430>
Other_Citation_Details: 19 p.
What geographic area does the data set cover?

West_Bounding_Coordinate: -133.084964

East_Bounding_Coordinate: -131.578121

North_Bounding_Coordinate: 55.676731

South_Bounding_Coordinate: 54.906660
What does it look like?
Does the data set describe conditions during a particular time period?

Calendar_Date: 1999
Currentness_Reference: ground condition
What is the general form of this data set?

Geospatial_Data_Presentation_Form: digital data
How does the data set represent geographic features?
1. How are geographic features stored in the data set?
2. What coordinate system is used to represent geographic features?
  
  Grid_Coordinate_System_Name: Universal Transverse Mercator
  
  Universal_Transverse_Mercator:
  
  UTM_Zone_Number: 8
  
  Transverse_Mercator:
  
  Scale_Factor_at_Central_Meridian: 0.999600
  
  Longitude_of_Central_Meridian: -135
  
  Latitude_of_Projection_Origin: 0
  
  False_Easting: 500000.000000
  
  False_Northing: 0
  
  Planar coordinates are encoded using coordinate pair
  Abscissae (x-coordinates) are specified to the nearest .00000001
  Ordinates (y-coordinates) are specified to the nearest .00000001
  Planar coordinates are specified in Meters
  
  The horizontal datum used is North American Datum of 1927.
  The ellipsoid used is Clarke 1866.
  The semi-major axis of the ellipsoid used is 6378206.40000000037.
  The flattening of the ellipsoid used is 1/294.978698199999997.
How does the data set describe geographic features?

ascii_data
ASCII format line data, other ASCII data (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc.)

databases_geosoft
Geosoft format database of line data, other Geosoft format databases (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc.)

documents
Project and field reports, survey background information, gridded data explanations, other supporting documentation (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))

grids_ermapper
Geographically registered gridded data, ER Mapper ERS format (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))

grids_geosoft
Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))

images_registered
GeoTiff format images of all gridded data (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

kmz
Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

maps_pdf_format
Printable maps in pdf format (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc.)

maps_prn_format
Printable maps in HPGL/2 printer file format with extension .prn (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc.)

profiles_stacked
Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc.)

vector_data
Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format (Source: Geoterrex-Dighem, and WGM Mining and Geologic Consultants Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))

Who produced the data set?

Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
- Burns, L.E.
- Graham, G.R.C.
- Barefoot, J.D.
- Geoterrex-Dighem
- WGM Mining and Geological Consultants, Inc.
Who also contributed to the data set?

Funding was provided by the U.S. Department of the Interior Bureau of Land Management (BLM), Ketchikan Gateway Borough, Sealaska Corporation, Alaska State Mental Health Trust Land Office, and the cities of Thorne Bay and Coffman Cove.
To whom should users address questions about the data?

Alaska Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

This airborne geophysical survey is part of a program to acquire data on Alaska's most promising mineral belts and districts. The information acquired is aimed at catalyzing new private-sector exploration, discovery, and ultimate development and production. The purpose of the survey was to map the magnetic and conductive properties of the survey area. The survey area includes the Niblack Cu-Zn-Pb-Ag-Au deposit, the Big Harbor Cu-Zn mine, as well as other massive sulfide prospects, such as Trio. Other gold and base-metal anomalies, altered zones, favorable lithologies, and structural zones are known to exist throughout the survey area.

How was the data set created?

From what previous works were the data drawn?
Burns, L.E., 1999 (source 1 of 60)
Burns, L.E., 1999, Portfolio of aeromagnetic and resistivity maps of selected areas near Ketchikan, southeastern Alaska: Geophysical Report GPR 1999-13, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/318>
Other_Citation_Details: 18 p

Type_of_Source_Media: paper

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 2 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-11A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/310>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 3 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-2A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/274>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 4 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-7A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/294>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 5 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-11B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/311>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 6 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-2B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/275>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 7 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-7B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/295>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 8 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-11C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/312>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 9 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-2C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/276>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 10 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-7C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/296>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 11 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-11D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/313>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 12 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-2D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/277>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 13 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-7D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/297>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 14 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-12A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/314>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 15 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/278>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 16 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-8A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/298>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 17 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-12B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/315>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 18 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-3B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/279>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 19 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-8B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/299>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 20 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-12C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/316>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 21 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-3C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/280>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 22 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-8C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/300>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 23 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-12D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/317>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 24 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-3D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/281>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 25 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-8D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/301>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 26 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, CD ROM containing gridded files and section lines of 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska: Geophysical Report GPR 1999-14, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/319>
Other_Citation_Details: 1 DVD

Type_of_Source_Media: paper

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 27 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, CD-ROM containing profile and gridded data and section lines of 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska: Geophysical Report GPR 1999-15, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/320>
Other_Citation_Details: 1 DVD

Type_of_Source_Media: paper

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 28 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-10A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/306>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 29 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-10B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/307>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 30 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-10C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/308>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 31 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-10D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/309>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 32 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Flight lines of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-4A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/282>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 33 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Flight lines of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-4B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/283>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 34 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Flight lines of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-4C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/284>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 35 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Flight lines of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-4D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/285>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 36 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-1 and B-2 quadrangles: Geophysical Report GPR 1999-16D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/324>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 37 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-2 and B-3 quadrangles: Geophysical Report GPR 1999-16C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/323>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 38 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-3 and B-4 quadrangles: Geophysical Report GPR 1999-16B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/322>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 39 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig C-1 and C-2 quadrangles: Geophysical Report GPR 1999-16A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/321>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 40 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Ketchikan A-6, B-5, and B-6 quadrangles: Geophysical Report GPR 1999-16H, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/328>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 41 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-1 and Ketchikan A-6 quadrangles): Geophysical Report GPR 1999-16F, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/326>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 42 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-2 and A-3 quadrangles): Geophysical Report GPR 1999-16E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/325>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 43 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-2 and Dixon Entrance D-2 quadrangles): Geophysical Report GPR 1999-16G, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/327>
Other_Citation_Details: 1 sheet, scale 1:31,680

Type_of_Source_Media: paper

Source_Scale_Denominator: 31680

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 44 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island (diazo film version): Geophysical Report GPR 1999-5A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/286>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 45 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-6A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/290>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 46 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island (diazo film version): Geophysical Report GPR 1999-5B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/287>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 47 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-6B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/291>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 48 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island (diazo film version): Geophysical Report GPR 1999-5C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/288>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 49 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-6C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/292>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 50 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island (diazo film version): Geophysical Report GPR 1999-5D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/289>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 51 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-6D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/293>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 52 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-1A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/270>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 53 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island: Geophysical Report GPR 1999-9A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/302>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 54 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/271>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 55 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island: Geophysical Report GPR 1999-9B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/303>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 56 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-1C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/272>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 57 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island: Geophysical Report GPR 1999-9C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/304>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 58 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-1D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/273>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Burns, L.E. and others, 1999 (source 59 of 60)
Burns, L.E., Geoterrex-Dighem, WGM, Inc., and U.S. Bureau of Land Management, 1999, Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island: Geophysical Report GPR 1999-9D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/305>
Other_Citation_Details: 1 sheet, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
Stephens, Mark and others, 1999 (source 60 of 60)
Stephens, Mark, McConnell, Doug, Rudd, Jonathan, and Geoterrex-Dighem, 1999, Project report of the 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska: Geophysical Report GPR 1999-17, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/329>
Other_Citation_Details: 240 p., 4 sheets, scale 1:63,360

Type_of_Source_Media: paper

Source_Scale_Denominator: 63360

Source_Contribution: Data collection, processing, and delivery
How were the data generated, processed, and modified?
Date: 1991 (process 1 of 11)
Historic data collection and processing - The airborne geophysical data for the Dolomi, Kasaan, and Hetta projects were acquired by Dighem under contract with American Copper & Nickel Company, Inc.

Date: 1999 (process 2 of 11)
Data collection, processing, and delivery - The airborne geophysical data were acquired under contract with WGM Mining and Geological Consultants, Inc. and Geoterrex-Dighem. The contractor's project report and other supporting documents are in the "documents" digital data package. They provide detailed documentation of the system specifications, data collection, processing, and delivery.
Data sources used in this process:
- Burns, L.E., 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Burns, L.E. and others, 1999
- Stephens, Mark and others, 1999
Date: 2019 (process 3 of 11)
Database development - Line data for the Ketchikan survey was delivered in several parts by the contractor. Most of the line data is in NAD 27 UTM Zone 8N, however, some data were collected in Zone 9N. These latter data were reprojected to UTM Zone 8N so grid development was possible. Original position data is noted in the database as "x_utm9" and "y_utm9." The line data were also merged into one database and then exported to an .xyz file using the Export Database option in Geosoft Oasis Montaj v9. The same was done for the electromagnetic anomaly data.

Date: 2019 (process 4 of 11)
Grid development - Grids provided by the contractor were merged with the Dolomi, Kasaan, and Hetta surveys, so each grid was regenerated to only include the data for the Ketchikan survey. Channels MAGF, RES900, RES7200, and RES56K were gridded using the Minimum Curvature option in Geosoft Oasis Montaj v9 with the following settings: grid cell size = 80 m, blanking distance = 800, cells to extend beyond data = 1. The analytic signal grid was generated by using the analytic signal function in Geosoft Oasis Montaj v9 on 100m upward continued simulated total magnetic field grid. The calculated first vertical derivative grid was created during the analytic signal process. The derivatives in the analytic signal calculation were computed using a fast Fourier transform (FFT) based 2D filter.

Date: 2019 (process 5 of 11)
RGB GeoTiff creation - RGB GeoTIFF raster files of gridded data were exported using Geosoft v9 by loading each Geosoft grid onto a map and using the map export tool.

Date: 2019 (process 6 of 11)
GeoPDF creation - Geospatial pdf file created using the Export Map function in Geosoft Oasis Montaj v9 with all maps layers visible.

Date: 2019 (process 7 of 11)
DXF conversion and geographic referencing - The contractor provided AutoCAD DXF files were converted to an ESRI Geodatabase in ArcMap v10 using the CAD to Geodatabase tool.

Date: 2019 (process 8 of 11)
Standard Boundary Polygon - The final boundary polygon was generated by loading the line data in Geosoft Oasis Montaj v9. The channel MAG was gridded using the Minimum Curvature option with the following settings: grid cell size = 25, blanking distance = 800, cells to extend beyond data = 2. The polygon file was created using Grid Outline tool with edge resolution = 1. The polygon file was exported to ESRI shapefile.

Date: 2019 (process 9 of 11)
Keyhole markup language (kml) KMZ archive creation - Data were exported from Geosoft and ESRI ArcMap to kml format files and/or KMZ archives. These files were then combined and modified in Google Earth Pro to create the final KMZ file.

Date: 2019 (process 10 of 11)
Simulated Magnetic Total Field - In this publication's older products and documentation the magnetic data products have been referred to as Total Field Magnetics on the maps and the MAGF channel in the line data and 'mag' as a filename abbreviation. The new term 'sim_magtf' has been created to rename and clarify that the data are not representative of the true total magnetic field as the IGRF values have been removed with a single average value added back to the entire dataset, resulting in the IGRF gradient being removed. The term simulated magnetic total field and the filename abbreviation 'sim_magtf' is now used to identify these magnetic data.

Date: 2019 (process 11 of 11)
Data cataloged for archival and publication - All files were renamed and placed in a standardized set of folders according to the DGGS Geophysics Data Management Manual. Where applicable and as needed data were converted to newer file formats and new files were created. Supporting documentation including but not limited to readme text files, maps, figures, survey overview report, missing data type explanations, and metadata were created.
What similar or related data should the user be aware of?
Staff, DGGS, 2014, Airborne GeophysWeb: A compilation of geophysical data from DGGS and cooperating agencies: Digital Data Series DDS 2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/27222>
Staff, DGGS, 2016, Alaska merged geophysical data grids: Digital Data Series DDS 12, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/29555>
Other_Citation_Details: 3 p

How reliable are the data; what problems remain in the data set?

How well have the observations been checked?
Geophysical data were acquired according to the contractor, contract, and request-for-proposals specifications. For additional detail about survey parameters, see the accompanying project report available in the documents directory of this data distribution package.
How accurate are the geographic locations?
These data are positioned with post-processed differential GPS. Discussion of grid resolution and factors that may impact the overall horizontal accuracy of the gridded data is available in the documents directory of this data distribution package.
How accurate are the heights or depths?
Not applicable
Where are the gaps in the data? What is missing?
This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area.
How consistent are the relationships among the observations, including topology?
Data originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).

Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

Who distributes the data set? (Distributor 1 of 1)

Alaska Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
What's the catalog number I need to order this data set?
GPR 2020-5
What legal disclaimers am I supposed to read?

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.

How can I download or order the data?

Availability in non-digital form:
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 by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other 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. 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 the exact shipping amount.
Cost to order the data: Contact DGGS for current pricing

Availability in digital form:

Data format:	DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ
Network links:	<http://doi.org/10.14509/30430>

Data format:

DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ

Network links:

<http://doi.org/10.14509/30430>

Cost to order the data: Free download

Who wrote the metadata?

Dates:

Last modified: 22-Apr-2020

Metadata author:

Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Metadata standard:

FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

<http://www.dggs.alaska.gov/metadata/dggs.ext>

Generated by mp version 2.9.21 on Wed Apr 22 19:02:34 2020