Open-File Report 99-028
This report contains aeromagnetic data for five areas in northern Wisconsin collected by the U.S. Geological Survey by means of a contract airborne survey, carried out between October 1997 and March 1998. Flights of the aeromagnetic survey were oriented in a north-south direction, at a spacing of 0.5-mile (805 meters), and draped to topography at 1,000 feet (305 meters) above ground. The five blocks of the survey required a total of about 21,000 line-miles of flying.
The aeromagnetic data include (1) point measurements taken at 1-second intervals, giving 15 fields of data in ASCII format, including flightline number, latitude, longitude, diurnally corrected magnetic intensity, residual (IGRF-removed) magnetic intensity, time, and altitude, (2) grids of residual magnetic intensity using a Transverse Mercator projection and given in several file formats, and (3) images of the aeromagnetic data and an index map, each given in four graphics formats.
Posted online October 15, 2009
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Daniels, D.L., Nicholson, S.W., and Cannon, W.F., 1999, Aeromagnetic surveying in Wisconsin 1997-98 -- Digital data files: U.S. Geological Survey Open-File Report 99-028, available online only.