Spatial Data Portals & Clearinghouses

GeoData@Tufts

The Tufts Geospatial Data Repository allows you to search, discover, preview, interact with the map, and retrieve geospatial data from university repositories.

ArcGIS Online

ArcGIS data server, including a number of world, US, and US state data sets that can be brought up directly in ArcGIS (click on a data set and if you have ArcGIS, it will open the program; alternatively, in ArcGIS, click on File – Add Data From ArcGIS Online)

GeoLode

Curated catalog of links to geospatial data sites.

David Rumsey Historical Map Collection

Digital, georeferenced historical maps.  Focus on rare 18th and 19th century maps of North and South America, although it also has maps of the World, Asia, Africa, Europe, and Oceania.

EROS Data Center

Earth Resources Observation and Science Center. Great source for U.S. topographic data and international DEMs.

GeoCommons Finder!

An open repository of data and maps for the world built by a public community of GeoIQ users.

Geodata.gov

Hosts U.S. federal, state, and local geographic maps and data and serves as a GIS data clearinghouse. Includes many data sets and services formerly published to Geography Network. In addition, 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.

Global Spatial Data Infrastructure Association (GSDI)

Spatial Data Infrastructure Links: list of portals by scale.

GIS Data Depot

Provides free and charged GIS data downloads and creates custom GIS data CD-ROMs for CAD, mapping, and location based applications.

Haiti Geospatial Data Resources

A guide to Tufts Haiti Geospatial Data Repository and for Online Haiti Geospatial Data repositories.

Harvard Geospatial Library

Free Digital Chart of the World (DCW) data and historic maps.

MapAbility.com

Free VMAP1 international data.

Starting the Hunt: Guide to Free Geospatial Data

Great site for state-wide data resources.

Tufts Geospatial Data Repository

GeoData@Tufts allows you to search, discover, preview, interact with the map, and retrieve geospatial data from university repositories.

US National Atlas

Source of National Atlas map data. Both downloadable data and Web Map Service.

Big Ten Academic Alliance Geoportal

The Big Ten Academic Alliance Geoportal provides discoverability and facilitates access to geospatial resources, including GIS datasets, web services, and digitized historical maps.