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.
Illustration of USGI GeoFramework model; USGI supports Congressional mandate for NCGMP to “bring together detailed national and continental-resolution 2D and 3D information produced throughout the Survey and by federal and state partners.”
Public Domain.
