Resources
"The mission of the National Geospatial Program is to provide National topographic information to advance science, support government, enlighten citizens, and enable decision making. The NGP provides a foundation of digital geospatial data representing the topography, natural landscape, and manmade environment of the United States."
A component of the National Geospatial Program, The National Map "is a suite of products and services that provide access to base geospatial information to describe the landscape of the United States and its territories."