The USGS has a tremendous amount of digital map data available to the public. While essentially all of these links and this data is available via the Data.gov website linked above, these direct links to smaller data sets might prove useful and more time efficient for some researchers to have them separated out.
|
Product |
Search or Order |
| DEM – Digital Elevation Model | http://earthexplorer.usgs.gov/ http://seamless.usgs.gov/ |
| DOQ – Digital Orthophoto Quadrangles | http://earthexplorer.usgs.gov/ http://seamless.usgs.gov/ |
| DLG – Digital Line Graphs | http://earthexplorer.usgs.gov/ |
| DRG – Digital Raster Graphics | http://earthexplorer.usgs.gov/ http://seamless.usgs.gov/ |
| National Map – Resource for GIS data of maps, imagery, and land use, also obtain elevations of properties | http://nationalmap.gov |
| National Map: Historical Topographic Map Collection | http://nationalmap.gov/historical/ |
| Seamless Database – Free download of imagery and elevation data | http://seamless.usgs.gov |
| GeoSpatial One Stop – Resource of Federal, state ,and local geographic data | https://catalog.data.gov/dataset |
| National Geologic Map Database – Resource for maps and related data about: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology. Search can be limited to digital data only. | http://ngmdb.usgs.gov/ngmdb/ngm_compsearch.html |
| NHD – National Hydrography Dataset – digital spatial vector data of surface water features such as lakes, rivers, streams, and wells |