introduction - Pennsylvania Natural Heritage Program

GIS DATA SOURCESBedrock geologic units of Pennsylvania, scale 1:250,000. Digital datasets prepared by C.E. Miles, T.G.Whitfield, from published 1980 state geologic map. 2001. Pennsylvania Bureau of Topographic andGeologic Survey, DCNR. Available online:http://www.dcnr.state.pa.us/topogeo/gismaps/digital.aspx. Accessed: 2001.Bishop, Joseph A. 1998. Managed Lands in Pennsylvania. Pennsylvania GAP AnalysisProject, Environmental Resources Research Institute.Bishop, Joseph A. 2003. IBA core polygon boundaries.Clearfield County GIS Office, 2000. Black and white digital photographs, countywide, resolution1:12,000.Ecological regions of North America, Level III. 1997. North American Commission for EnvironmentalCooperation. Available online: http://www.epa.gov/wed/pages/ecoregions/na_eco.htm. Accessed:March 2004.Local roadways in Clearfield County, Pennsylvania. 2003. Pennsylvania Department of Transportation,Bureau of Planning and Research, Geographic Information Division.National Elevation Dataset for Clearfield County, Pennsylvania, U.S. Geological Survey,EROS Data Center 1999 (Hill shade map).National Land Cover Data Set for Pennsylvania; Albers Grid. Compiled from Landsat satellite TMimagery (circa 1992) with spatial resolution of 30 m. USGS 1999.National Wetlands Inventory ArcInfo Coverages. U.S. Fish and Wildlife Service. Available online:http://wetlands.fws.gov/Maps/maps.htm. Accessed: June 2001.Pennsylvania Minor Civil Divisions: PA Explorer CD-ROM Edition, EnvironmentalResources Research Institute, from the Pennsylvania Department ofTransportation’s civil divisions data set 1996.Pennsylvania Natural Diversity Inventory (PNDI) Spatial Database. Pennsylvania Natural HeritageProgram, 2004.Pennsylvania’s Physiographic Regions: PA Explorer CD-ROM Edition, EnvironmentalResources Research Institute, 1996. (see Sevon in references for map authorship).Pennsylvania-Small Watershed, Environmental Resources Research Institute,Pennsylvania Department of Environmental Protection, 5/3/1997.State maintained roadway centerlines of Pennsylvania, 2003. Pennsylvania Department ofTransprotation, Bureau of Planning and Research, Geographic Information Division.Streams of Clearfield County. PA Explorer CD-ROM Edition, EnvironmentalResources Research Institute, 1996.USGS 1:24,000 Topographic quadrangles. Pennsylvania Spatial Data Access (PASDA), downloaded2000. http://www.pasda.psu.edu/151