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Pennsylvania Spatial Data Access
PASDA is the official public access geospatial information clearinghouse for the state of Pennsylvania, providing free shapefiles, KMLs, and WMS from a wide variety of agencies around Pennsylvania. Catalog contains data from the City of Philadelphia, the Delaware Valley Regional Planning Commission, and the USGS, among others.
Philadelphia County Digital Orthophoto Quads
Archive of older USGS aerial photographs in JPEG format.
Philadelphia Water Department Maps
KMLs of waterbodies, watersheds, and sewer areas, with other GIS data available on request.
Philly Tree Map
Editable tree inventory database with information on individual trees and ecosystem benefits. Downloadable as KML and CSV.
Web map of locations of facilities in the EPA's Toxic Release Inventory database. Downloadable as shapefile, GeoRSS, KML, or CSV with latitude and longitude. Coordinate system is GCS North American Datum 1983 (may not be included with download).
Collection of digitized maps related to the history of Philadelphia's watersheds and sewers.
DVRPC Environmental Justice Map
Maps Indicators of Potential Disadvantage.
Locations of community-based EPA grants, water monitoring stations, pollution sites, and demographics.
The links below lead to collections of data sets on PASDA.