A history of the relation of geology during the first 110 years of the U.S. Geological Survey to the development of public-land, Federal-science, and mapping policies and the development of mineral resources in the United States

from The National Geospatial-Intelligence Agency

GIS database download

using USGS maps to teach about Lewis & Clark

“Geodetic control is required to support mapping of the airports across the United States”

The mission of the ASPRS is to advance knowledge and improve understanding of mapping sciences and to promote the responsible applications of photogrammetry, remote sensing, geographic information systems (GIS), and supporting technologies.