Geographic Information Systems
Geographic Information Systems (or GIS) are large datasets of information regarding geographic elements.
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The following is a list of sources of GIS information. The sources are listed in catagories such as "International/Worldwide, National, and State/Profidence. The listings within each catagory are listed alphabetically. As is prohibited by the User Agreement, please refrain from linking to for-profit data companies.
Data Sources
International/Worldwide Data Sources
National Data Sources
USGS National Map Viewer - data provided by the United States Geological Survey
GeoData - Large repository of nationwide geographic data
NBII - National Biological Information Infrastructure
State/Province Data Sources
Massachusetts
MassGIS - Massachusetts stateside GIS dataset
BRA Models - 3D digital models of the city of Boston from the Boston Redevelopment Authority
Pennsylvania
PASDA - Pennsylvania Spatial Data Access
Open Source and/or free software
The following is a list of freely available GIS software. Please note the individual software license for each product. As is prohibited by the User Agreement, please refrain from linking to proprietary and/or for-profit software companies.
Index of open source and free GIS software:
opensourcegis.org - A large repository of open source GIS software sources.
GRASS - A very powerful open source GIS platform.
WorldWind - An Open source virtual globe similar to Google Earth.