This site is the clearinghouse gateway to USGS national mapping and remotely sensed data.

A distributed digital library for geographically-referenced information

The Consortium for International Earth Science Information Network (CIESIN) facilitates access to data and information on human interactions in the environment, global environmental change, and sustainable development.

Links to the world's major geo-spatial data collection and distribution centers.

UNEP/GRID Geneva maintains a large and actively growing archive of global small-scale environmental data sets

A comprehensive source of information about satellite and in situ Earth science data, with broad coverage of the atmosphere, hydrosphere, oceans, solid earth, and biosphere

Natural Resources Conservation Service distributes Natural Resources Inventory, Climate, Plants, and Soils data to the general public.

Tasked to develop procedures and assist in the implementation of a distributed discovery mechanism for digital geospatial data.

A site from British Columbia that contains all documentation for spatial data creation and use as well as links to other programs and data.

A commercial site with a catalog of over 1 million geographic datasets.

Provides a searchable database for downloadable GIS data.

Offers GIS and GPS software packages, as well as add-ins for Microsoft Access, free Tiger data and maps, etc.

TerraServer hosts the world's largest online database. It's a huge repository of aerial photographs and satellite images taken from miles overhead that you can view and, if you want, purchase.

Website and FTP site, initiated by the Canada Centre for Remote Sensing, that distributes free geospatial data.

Mapping Service Branch, Earth Sciences Sector, Natural Resources Canada has topographic maps, aerial photography, toponymic information, digital topo. maps, and an aerial survey database.

GISLinx data section has numerous links to other data depots and archive sites.

R&D center ScanEx specializes in area of satellite remote sensing data acquisition and distribution and offers archived images from the Resurs-O1 satellite and the OMS-2P camera onboard the MIR station.

The Data Depot supplies a complete listing of demographic, marketing, and mapping data for the UK and Europe.

The Georgia GIS Data Clearinghouse provides access to GIS resources of Georgia for use by government, academia, and the private sector. 

State database with DLG, DRG, DEM, and Tiger Data.

State data including DLG, DEM, DOQQ, imagery, etc.

State databases, datalayers, online mapping, municipal resources, maps.

Metadata and data repository hosted by the New York State Library.

PASDA is a World Wide Web based system that supports search, display, and retrieval of FGDC (Federal Geographic Data Committee) standard metadata, geographic information systems (GIS) data, and imagery related to Pennsylvania's environment. 

Gateway to all available digital spatial data for the State of Rhode Island.

Maintained by the Natural Resources Information Management and Analysis Section within the Water Resources Division of SCDNR.

State database with mapping, GIS, GPS, and environmental database information.