Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The National Geospatial Program (NGP) provides a foundation of digital data representing the topography, natural landscape, and manmade environment of the United States through The National Map Data Download and Visualization Services (TNM Viewer).
Operational support for these services is provided by NGTOC and CEGIS.