Geographical, Environmental, and GIS Data

ArcGIS Online standard map services are available at no cost for internal (personal or within an organization) and noncommercial, external use.

Descriptions of the Federal datasets, information about how to access the datasets, and tools that leverage government datasets.

Free geographic (GIS) data for any country in the world

Illinois data from the USGS, ESRI, EPA, Fish and Wildlife Wetlands, Agriculture's Soil conservation, FEMA flood and coastal barriers, Census Bureau, and others.

Provides OpenStreetMap data in various formats that can be imported into other GIS software.

One stop for federal, state, and local GIS data.

This link will take you to a guide published by Purdue libraries with links to data by state.

Free vector and raster map data at 1:10m, 1:50m, and 1:110m scales

Data from the U.S. Census Bureau

More than 660,000 large-scale maps of more than 12,000 American towns and cities

The NASA Earth Observations Photography database

Satellite Images of Environmental Change

Global maps about parts of our climate system.

Aerial Photographs and Satellite Images