Spatial Data Resources
The Esri Maps and Data group provides access to online basemap and reference map services, map layers and documents, and tools to use in your GIS work.
The collection focuses on rare 18th and 19th century North American and South American maps and other cartographic materials. Historic maps of the World, Europe, Asia, and Africa are also represented.
USGS repository for remotely sensed data. Free login will allow access to higher resolution data.
Earth Resources Observation and Science Center. Providing science and imagery to better understand our Earth; including U.S. topographic data and international DEMs.
Visualize data from numerous sources to identify trends that were before unseen. Map your data with real-time social data and the over 50,000 open-source data sets in GeoCommons.
Data.gov has integrated the Geospatial One-Stop (GOS) portal and catalog, and added some exciting improvements to both the user interface as well as the underlying infrastructure.
Site with additional links for GIS and other data.
GIS Data Depot (No longer available)
Numerous data holdings are available for free download, otherwise, data can be downloaded via our "Premium" option or written to CD-ROM. Note that data available from this site requires users to be proficient in GIS and may require access to GIS software.
Free digital data and historic maps.
Free maps, images, relief tiles and VMAP1 international data.
Geospatial and Attribute Links, U. S. resources are listed by state or by nation-wide collections.
Site allows you to search, discover, preview, interact with the map, and retrieve geospatial data from university repositories.
US National Atlas (No longer available)
It's the new set of digital cartographic frameworks from The National Atlas of the United States of America ® at a scale of 1:1,000,000. We will also include national images of elevation, land cover, and Landsat at 100-meter ground resolution.