Since 2011, the U.S. Geological Survey (USGS) has digitized 190,000 topographic maps dating back to 1884. These georeferenced maps provide critical clues about early oil and gas drilling activities.

3DEP, led by the USGS National Geospatial Program, offers the nation's first baseline of seamless, high-resolution topographic elevation data, which is then incorporated into The National Map.