Maps and Geographic Information Systems: GIS

Generalized extracts of the TIGER line files for several administrative areas (i.e., states, counties, zip codes) and census areas (i.e. block groups, tracts) in the US from 1990, 2000 and 2010.

CIESIN works at the intersection of the social, natural, and information sciences, and specializes in on-line data and information management, spatial data integration and training, and interdisciplinary research related to human interactions in the environment.

"The Dataverse Network is an open source application to publish, share, reference, extract and analyze research data. It facilitates making data available to others, and allows you to replicate others work. Researchers, data authors, publishers, data distributors, and affiliated institutions all receive appropriate credit."

East View offers a wide range of geospatial products, and are moving into offering cloud-based storage of, and potential upload of, GIS data.

Includes imagery, street, and topography base maps, shaded relief, and physical maps.

The Geospatial Data Gateway (GDG) is the One Stop Source for environmental and natural resources data, at anytime, from anywhere, to anyone. The Gateway allows you to choose your area of interest, browse and select data from our catalog, customize the format, and have it downloaded or shipped on CD or DVD.

Provides shared and trusted geospatial data, services, and applications for use by government agencies, their partners and the public.

Repository with free KML applications ranging from aeronautical charts to current events that can be viewed in Google Earth. Popular downloads include the ability to view topographic maps draped three-dimensionally onto the surface of the earth.

A collection of 6,871 worldwide and regional geographic data layers, scanned historic maps and associated descriptive information that can be searched, mapped online, and downloaded for use for use with GIS software.

List of GIS resources, both national and regional.

Created by the Map and Geospatial Information Round Table of the American Library Association.

MAGIC has a large collection of digitized historical maps of Connecticut, Northeast United States, New England, and United States. Most can be downloaded at high-resolution; the center is working on geo-referenced versions for Google Earth.

Vector GIS data related to Missouri including transportation, geophysical, and healthcare data.

Aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2011.

Vector and raster map data at 1:10m, 1:50m and 1:110m scales.

OpenGeoportal.org is a new group of geospatial professionals, developers, and librarians working together on a collaboratively developed, open source, federated web application to discover, preview, and retrieve geospatial data. It is also a collaborative effort to share resources and best practices in the areas of application development, metadata, data sharing, data licensing, and data sources.

Extracts of US Census Bureau's TIGER line files for all legal, administrative, and statistical areas in the US, updated annually.