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Ketchikan Geophysical Survey

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.

Available Data Metadata Overview
File Name Data File Format File Size Info
Download gpr2020_005_ketchikan_vector_data Vector data 51.1 M Read me
Download gpr2020_005_ketchikan_maps_prn_format Plot files 75.8 M Read me
Download gpr2020_005_ketchikan_databases_geosoft Linedata Geosoft format database 196.7 M Read me
Download gpr2020_005_ketchikan_images_registered Image files 5.9 M Read me
Download gpr2020_005_ketchikan_grids_geosoft Gridded data Geosoft format 5.5 M Read me
Download gpr2020_005_ketchikan_grids_ermapper Gridded data ER Mapper 5.4 M Read me
Download gpr2020_005_ketchikan_kmz Google Earth files 72.0 M Read me
Download gpr2020_005_ketchikan_documents Adobe PDF files 1.4 M Read me
Download gpr2020_005_ketchikan_maps_pdf_format Adobe PDF files 155.4 M Read me
Download gpr2020_005_ketchikan_profiles_stacked Adobe PDF files 335.2 M Read me
Download gpr2020_005_ketchikan_ascii_data ASCII tabular files 203.3 M Read me

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