PASDA (Pennsylvania Spatial Data Access) is the Commonwealth of Pennsylvania's official public geospatial data clearinghouse, hosted at Penn State. It distributes authoritative GIS data from state agencies, federal sources, and local governments covering Pennsylvania.
Datasets include imagery, elevation, transportation, hydrography, parcels, and administrative boundaries, available as direct downloads and web services. As a long-running clearinghouse, PASDA is the go-to source for Pennsylvania GIS data.