|-99999||Areas outside the irregular survey boundary|
|Range of values|
Data were collected between 1945 and 1982 by the U.S. Geological Survey and by private contractors under contract to the U.S. Geological Survey and other government organizations.
Presentation of gridded aeromagnetic data values for use in geological and geophysical studies.
Are there legal restrictions on access or use of the data?
The USGS has made every effort to verify the veracity of this information, but is not liable for any inaccuracies.
|Data format:||Gridded files for the Alaska composite (akc*) and merged (akm*) aeromagnetic data. New versions of the grids were added to the web site in February 1999. These grids are akc_msat* and akm_msat*. The new grids contain a regional surface correction based on a satellite magnetic model of the long wavelengths of the Earth's magnetic field (see March 1999 issue of GSA Today for more information). The original grids contained a questionable long-wavelength trend which caused the NW portion of the grids to be tipped downward (there was also a spurious trend with a different slope in SE Alaska). in format ARCE (version 7.x) Size: 8.7|