UNITED STATES AEROMAGNETIC DATABASE: A COMPANION TO THE NORTH AMERICAN MAGNETIC ANOMALY MAP
For the national compilation that forms part of the North American database, the USGS has constructed a database containing the original aeromagnetic survey data, in digital form, from surveys and maps of existing public-domain, and where available, proprietary magnetic data (about 5,800,000 line-km). These data either exist as digitally processed flight-line data or were derived from analog maps if the flight-line data were not available. The ASCII data sets for publicly-available aeromagnetic surveys of the U.S. are available on-line or on disk. In this poster, we document the history of aeromagnetic data collection in the U. S. and describe both the construction of the ASCII database and the metadata files that provide information about each survey.