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Ponds: Centre County, Pennsylvania penn-state

2006-2016. Centre County Government. This layer was originally created as part of the 2006 PAMAP LiDAR project but has since been updated by the Centre County GIS Department.


Contours: Montgomenry County, Pennsylvania penn-state

2005. BAE Systems. An elevation or topographic contour is a line that connects a series of points of equal elevation and is used to illustrate topography, or relief, ...


Tornados Pennsylvania 1950 to 2004 penn-state

2005. National Weather Service, Storm Prediction Center. This map layer shows tornado touchdown points in the United States, Puerto Rico, and the U.S. Virgin Islands, from 1950 to 2004. Statistical data w...


Zebra Mussel Distribution: United States penn-state

2008. United States Geological Survey (USGS). The concern caused by the explosive spread of the zebra mussel, (Dreissena polymorpha), within the United States resulted in passage of the Nonindi...


Street Edge of Pavement: Allegheny County, Pennsylvania penn-state

2006. Allegheny County Division of Computer Services Geographic Information Systems Group. Edge of Pavements are the edges of all public thoroughfares including paved roads, unpaved roads, bridges, overpasses, tunnels, alleys, stairways a...


Chesapeake Bay Watershed Land Cover Data Series 2006 penn-state

2006. United States Geological Survey (USGS). To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...