DEM/Basemap Data Sources

Here’s where to find Digital Elevation Model (DEM) and other base data online.

Topo Maps for Free (USA): A list from Natural Graphics

Duke Libraries GIS Portal
Links to GIS data of all types. Try Earth Explorer first for DEM data.

Earth Explorer (USGS)
Create a login with USGS first.

SRTM Tile Grabber
Simple, cool interface for zipped GeoTiff DEMs.

Earth Resources Observation & Science (EROS)

Center for Spatial Information Science & Systems (CSISS)

National Elevation Dataset (NED)
No longer operational. See EarthExplorer website.

Geospatial Data Gateway (GDG)
Free w/login

CGIAR-CSI / Shuttle Radar Topography Mission (SRTM – 90m)
Free, worldwide coverage

Google Earth Library – SRTM KML Project (90m)

Global Land Survey Digital Elevation Model (GLSDEM)
Free. See the Download Data Guide on the site.

Global Digital Elevation Model (GTOPO – 1km)

Advanced Spaceborne Thermal Emission & Reflection Radiometer (ASTER-GDEM)
Free w/Login.

Free, limited coverage.

ASTER Orthocoverage
Free samples.

Système Pour l’Observation de la Terre (SPOT)
DEMs and imagery for purchase, some samples

Canadian DEMs, data, and imagery.

Canadian DEMs, data, and imagery for free

DEM of Italy
Complete 10m DEM of Italy (TINITALY/01) by DIGITALIA and Tarquini et al. (2007).
Submit request for data.

Puget Sound and Regional Data
Geomorphological Research Group at University of Washington
David Montgomery/Harvey Greenberg

TanDEM-X Intermediate
German Aerospace Center (Microwaves and Radar Institute)