Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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21. 7.5 minute digital elevation models (DEM) for Virginia (30 meter): Virginia, 2000

1979. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

22. 7.5 minute digital elevation models (DEM) for West Virginia (30 meter): West Virginia, 2000

1979. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

23. 7.5 minute Digital Raster Graphics for Pennsylvania - UTM - cropped collars: Pennsylvania, 1996

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars, georeferenced to the UTM grid.

24. 7.5 minute Digital Raster Graphics for Pennsylvania - UTM grid - NAD 1983 - cropped collars: Pennsylvania, 1996

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars, georeferenced to the UTM gr...

25. 7.5 minute Digital Raster Graphics for Pennsylvania- Albers - cropped collars: Pennsylvania, 1996

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars in Albers projection.

26. 7.5 minute Digital Raster Graphics for Pennsylvania UTM grid - NAD 1983: Pennsylvania, 1996

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

27. 7.5 minute Digital Raster Graphics UTM: Pennsylvania, 1996

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

28. Aerial Imagery: Iowa, 2016

2016. Iowa Homeland Security and Emergency Management. This aerial imagery was flown in the spring of 2016 over the eastern part of the state. it is four-band imagery that includes the near-infra-red ba...

29. Aerial Photography: Carver County, Minnesota, 2005

2005. CarverGIS. Carver County 2005 Aerometric Imagery.

30. Aerial Photography: Carver County, Minnesota, 2008

2008. CarverGIS. Carver County 2008 Pictometry Imagery.

31. Aerial Photography: Carver County, Minnesota, 2011

2011. CarverGIS. Carver County 2011 Pictometry Imagery.

32. Aerial Photography: Carver County, Minnesota, 2013

2013. CarverGIS. Carver County 2013 Aerometric Imagery.

33. Aerial Photography: Iowa, 1930s

1930. Iowa DNR. This dataset represents panchromatic orthophoto imagery produced from black and white aerial photographs. This dataset was developed from individua...

34. Aerial Photography: Iowa, 1950s

1950. Iowa DNR. This dataset represents panchromatic images produced from black and white aerial photographs. This dataset was developed from individual aerial ima...

35. Aerial Photography: Iowa, 1960s

1960. Iowa DNR. This dataset represents panchromatic images produced from black and white aerial photographs. This dataset was developed from individual aerial ima...

36. Aerial Photography: Iowa, 1970s

1970. Iowa DNR. This dataset represents panchromatic images produced from black and white aerial photographs. This dataset was developed from individual aerial ima...

37. Allegheny County - Blocks: Pennsylvania, 2002

2002. Allegheny County Division of Computer Services Geographic Information Systems Group. Derived from original MAPINDX: Map Index Sheets from Block and Lot Grid of Property Assessment and based on aerial photography, showing 1983 datum ...

38. Allegheny County - Contours: Pennsylvania, 2006

2006. Allegheny County Division of Computer Services Geographic Information Systems Group. Contour data was created as a result of a county flyover in the spring of 2004. Contours were created from a DTM Feature Dataset, upgraded by Baker...

39. Allegheny County - Slopes: Pennsylvania, 2010

2010. Allegheny Places Design Team. Slope data.

40. Allegheny County - Spot Elevation: Pennsylvania, 2006

2006. Allegheny County Division of Computer Services Geographic Information Systems Group. Spot Elevation data was created as a result of a county flyover in the spring of 2004. They were created from a DTM Feature Dataset, upgraded by Ba...