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Pennsylvania, United States

latitude: 40.27, longitude: -76.91
Browse map of Pennsylvania 40°16′12.00″ N, 76°54′36.00″ W
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Pennsylvania is a state in the United States at latitude 40°16′12.00″ North, longitude 76°54′36.00″ West.

Need help?

There is a mailing list for discussing US-specific issues. It is the best place to find other US mappers.


Initial TIGER imports contained quite a few duplicate counties in Pennsylvania. These have now been fixed. Some counties require extensive review as ways do not correspond to aerial imagery, or are over-connected or otherwise badly proportioned. Correcting these issues is a relatively easy way to get involved in improving OSM, yet tremendously helpful. There is an extensive guide to improving the TIGER import.

Route relations

Useful resources

Aerial Imagery

The Pennsylvania Spatial Data Access (PASDA) site has high-resolution images of the entire state from the PAMAP program.

At PennPilot, there is aerial photographs of Pennsylvania in the 20th century.



The PASDA site has lots of data from the state government we can use, including State Parks, State Game Lands, and State Forests. Some of this data was imported late 2007 by Adam Killian.

Though an initial, guesstimated value of landuse=forest or natural=wood may be appropriate for these areas, you are encouraged to map the park boundaries orthogonal to the actual land use. This means that park boundaries should be tagged as boundary=national_park with admin_level=4 (state-level), with appropriate tags for the park type. The actual land use should be surveyed or may even be determined from hi-res aerial imagery in the case of a forest. See the image to the left for an example: the green area (forest) extends beyond the state forest boundary, marked by the dashed green line.

Importing PASDA data

The data is in shapefile format. Here is the process Alexrudd used to manipulate one.

  • Download and install QGIS. It is available on both Windows and Linux.
  • Download and unzip the dataset from PASDA. Some data is in raster form, which cannot be used. Make sure it is in vector form.
  • Try opening the shapefile with QGIS. Layer > Add Vector Layer (V)
  • Theoretically, it will read the associated .prj file and determine the projection automatically. However, this often did not work and QGIS asked me to specify the projection manually. Determine the projection by looking at the metadata. (Either in a .xml file or on the PASDA download page.)
    • The WGS84 and NAD83 projections are built-in, under Geographic Coordinate Systems.
    • One dataset (streams 2004) required a custom projection, based on the Albers Equal Area. Create a custom coordinate system (Settings > Custom CRS) Here is the proj4 line defining it.
      • +proj=aea +lat_1=40 +lat_2=42 +lat_0=39 +lon_0=-78 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m
    • Some datasets are Lambert Conformational Conic, which can be found in Projected Coordinate Systems > Lambert Conformational Conic > NAD83 Pennsylvania xxxx. XXXX is either North, North(ftUS), South, or South(ftUS). Pick either North or South, and meters or feet.
  • Examine the data, and select your area of interest with the Select tool (on the main toolbar, next to Identify Feature.)
  • Right click on the data layer in the Legend on the left, and select Save selection as shapefile
  • When prompted, pick WSG84(EPSG:4326) as the new projection for the saved shapefile.
  • Use to convert the shapefile to a .osm file and open in JOSM.

Roads and highways

At PennDOT PDF maps, there are several different types of maps of PennDOT infrastructure.

Hiking Trails

Cycle Routes