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Government Websites
NOAA and its Climate Analysis Branch
Pennsylvania
Geologic Survey
Contains digital geospatial data, information on PA's geologic hazards
and groundwater, and collection of maps and photographs.
State Data Centers
Tiger
Mapping Service
US Census data available in map format
U.S. Census Bureau
US Gazetteer
(US Census Bureau)
Searchable database of geographic places, with links to the Tiger Map
Service.
U.S. Geological Survey (USGS)
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Maps
Maps for travel or directions:
PennDOT
Road Maps
County, township, borough, railroad and other maps. Detailed enough to
show every street in the state. File sizes are large, but they are the
most accurate maps for the state.
Current Maps online:
Historical Map Collections online:
Geography Websites
Geographic
Names
Look up names and locations of places in the US and its territories based
on location or feature type.
Geography Network
Awesome virtual library of worldwide sites that provide maps, geographic
data, and much more. Try especially their Geography Network Explorer,
an interactive tool for locating geographic information.
Pennsylvania Spatial Data
Access
This site contains data, maps and other geospatial information on Pennsylvania,
including information on watersheds and wildlife.
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