USGS National Geospatial Program

Overview
The USGS National Geospatial Program (NGP) organizes, maintains, and publishes the geospatial baseline of the U.S.'s topography, natural landscape, and built environment, including transportation features. The National Map is a subcomponent of the NGP within the USGS organizational structure.

Source

 * Geospatial Information and Geographic Information Systems (GIS): An Overview for Congress, at 16.