South-Central Pennsylvania imagery from PA Geological Survey/USGS Orthoimagery for south-central Pennsylvania captured in April of 2003. These images are MrSid compressed natural color orthoimages which were produced at 2-feet pixel resolution. Each tile represents a portion of a ten county area located in south-central Pennsylvania.
Numerous downloadable data for Philadelphia. See also the web interface at http://citymaps.phila.gov/citymaps/default.aspx
What’s In My Watershed? is a mapping application that provides the user with an easy to use tool for locating their neighborhood and obtaining information about their environment.
Follow this link to the The Penn State University Libraries Maps and Data Center download site
Pennsylvania resource for GIS data downloads – Pennsylvania Spatial Data Access (PASDA) is Pennsylvania’s official public access geospatial information clearinghouse.