Digital Chart of the World
1:1,000,000 scale data world-wide from Penn State University.

EnviroMapper
From the USEPA allows you to map features across the US.

ESRI
Visit the ESRI homepage to learn more about their GIS products.

Federal Geographic Data Committee
The Federal Geographic Data Committee is a 19 member interagency committee composed of representatives from the Executive Office of the President, Cabinet-level and independent agencies.

National Geodetic Survey
NOAA's National Geodetic Survey (NGS) defines and manages a national coordinate system.

National Mapping Information
From United States Geologic Survey (USGS).

NOAA mapfinder
The NOS Data Explorer serves as a portal to obtain NOS spatial data.

USEPA Region 2 GIS links
Need default notes for this item.

USEPA Region 5 FIELDS System
The FIELDS (FIeld EnvironmentaL Decision Support) Team is a collaboration of Region 5 employees and Research Associates centered in the USEPA Region 5 Superfund Division formed to provide the Agency with the internal capability for rapid and effective contaminated site characterization.

USGS Geo-Data Explorer
Use GEO-DATA Explorer (GEODE) to access, view, and download information from geo-spatial databases containing a broad spectrum of data produced by the USGS and other government agencies.

Water resources of the United States
Water is essential for life. USGS operates in every State; the Water Resources mission is to provide water information that benefits the Nation's citizens.