We combine long-term records from aerial photographs, detailed mapping using survey-grade GPS, and ground-based lidar with meteorological monitoring. Sand dune migration rates are currently about 35 meters per year.
Organizational unit within USGS supporting acquisition and management of trusted geospatial data, products, and services needed for The National Map, the National Atlas, and related efforts.
Main page for National Hydrography Dataset (NHD), a comprehensive set of digital spatial data about surface water features, with links to references, data, software tools, applications, tutorials, technical support, and data maintenance.
Portal to general information on the National Atlas of the United States with access for producing specialized maps and links to thematic maps including interactive maps, multimedia maps, map layers data warehouse, wall maps, and printable maps.
Post-earthquake map derived from 1:24,000-scale base maps incorporating high- and medium-resolution remotely sensed imagery following the 7.0 magnitude earthquake near the capital city of Port au Prince, Haiti, on January 12, 2010
Post-earthquake map derived from 1:24,000-scale base maps incorporating high- and medium-resolution remotely sensed imagery following the 7.0 magnitude earthquake near the capital city of Port au Prince, Haiti, on January 12, 2010
We are scanning all scales and all editions of approximately 250,000 topographic maps published by USGS since the inception of the topographic mapping program in 1884. They will be available to the public at no direct cost.