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Nikolai Geophysical Survey

The Nikolai electromagnetic and magnetic airborne geophysical survey is located in interior Alaska in the Delta River mining district, about 200 kilometers southeast of Fairbanks. Frequency domain electromagnetic and magnetic data were collected with the Aerodat Condor system in 1995. A total of 3412.8 line kilometers were collected covering 660.1 square kilometers. Line spacing was 200 meters (m). Data were collected on a helicopter towed sensor platform ('bird') on a 30 m long line. The electromagnetic equipment recorded data slightly above 30 m above ground level (AGL), and the magnetometer recorded data slightly above 45 m AGL due to safety considerations. The Nikolai data were provided to DGGS by the U.S. Department of Interior Bureau of Land Management (BLM) and were merged with the Southern Delta River survey (2002) as a contract deliverable. The 2003 release of the Southern Delta River survey included map sheets of the merged data.

Available Data Metadata Overview
File Name Data File Format File Size Info
Download nikolai_1995_vector_data Vector data 342.4 M Read me
Download nikolai_1995_maps_prn_format Plot files 246.0 M Read me
Download nikolai_1995_databases_geosoft Linedata Geosoft format database 40.1 M Read me
Download nikolai_1995_images_registered Image files 20.1 M Read me
Download nikolai_1995_grids_geosoft Gridded data Geosoft format 7.2 M Read me
Download nikolai_1995_grids_ermapper Gridded data ER Mapper 23.1 M Read me
Download nikolai_1995_kmz Google Earth files 23.1 M Read me
Download nikolai_1995_documents Adobe PDF files 14.2 M Read me
Download nikolai_1995_maps_pdf_format Adobe PDF files 1.4 G Read me
Download nikolai_1995_ascii_data ASCII tabular files 133.4 M Read me

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