As a cornerstone of the U.S. Geological Survey's National Geospatial Program (NGP), The National Map (TNM) is a collaborative effort among the USGS and governmental, academic, non-profit, and industry ...

All topographic maps produced by the U.S. Geological Survey (USGS) are in the public domain and are not copyrighted except for the following three cases that apply only to US Topo maps (produced ...