NGTOC - 3DEP mountains

Welcome to the National Geospatial Technical Operations Center (NGTOC) Web Page.  The NGTOC has a rich history dating back to 1889 when Congress first made annual appropriations to the USGS for topographic mapping. Employees in the Center today continue to perform the USGS National mapping mission by supporting The National Map,  3D Elevation Program, National Hydrography, and US Topo.