|OFR 99–0557: Readme File|
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U.S. DEPARTMENT OF THE INTERIOR
U.S. Geological Survey
From 1976 through 1999 (and on a continuing basis), the U.S. Geological Survey digitized analog magnetic maps for various regions of the United States. The purpose of this program is to fill in gaps that are not covered by modern digital aeromagnetic surveys.
This CD-ROM contains all available digitized magnetic files that are currently on record at the U.S. Geological Survey for the continental U.S., Hawaii, and Puerto Rico. Updates will be made available to the public as they are released on our FTP sites.
Longitude, Latitude, Magnetic Field Value - (2f11.4, f8.1)
NOTE: longitude and latitude are defined to four decimal places (10 meter resolution) because this is the most reasonable accuracy that can be standardized for the variety and scaling of the original maps.
*.JPG images of the data were created using a Geographic Coordinate (longitude, latitude) System and the Clarke 1866 datum.
The procedure used to digitize the XYZ files was one of the following three methods:
NOTE: This CD-ROM was developed on a Pentium II PC using the Hyper Text Markup Language. It was tested extensively using NETSCAPE versions 3.0 through 4.65 and MS Internet Explorer versions 3.0 through 5.0. Testing of the CD was done for Apple Macintosh and on a SUN UNIX System. In theory because this is an HTML product, it should run on most platforms using various browsers.
If you have any questions or problems about the data on this CD-ROM, please contact Bob Kucks at 1-303-236-1405 or Pat Hill at 1-303-236-1343.
*This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Use of brand names is for descriptive purposes and does not constitute endorsement by the U.S. Geological Survey.
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