Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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1.
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Aerial Photo Centers, Maryland Imagery Acquisition Flight Information: Maryland

2018. Aerial photography centers for the 2016 & 2017 high-resolution imagery acquisition.

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Base Map: Pennsylvania

2018. Pennsylvania Base Map.

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Basemap of Washington, D.C.

The DC Basemap web service provides a reference map for the District of Columbia projected in Web Mercator. Access theArcGIS Rest endpointorview a ...

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Basemap of Washington, D.C. in Dark Gray

The Dark Gray DC Basemap web service provides a reference map for the District of Columbia projected in Web Mercator. Access theArcGIS Rest endpoin...

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Basemap of Washington, D.C. in Light Gray

The Light Gray DC Basemap web service provides a reference map for the District of Columbia projected in Web Mercator. Access theArcGIS Rest endpoi...

6.
Boundaries of Planning Projects & Scanned Drawings: Howard County, Maryland

Boundaries of Planning Projects & Scanned Drawings: Howard County, Maryland

The polygon boundaries of scanned plan drawings. Each boundary is hyper-linked to a unique drawing in .PDF format. The .PDF may be downloaded usi...

7.
County-wide Mosaics of 7.5 Minute USGS Topographic Maps: Iowa

County-wide Mosaics of 7.5 Minute USGS Topographic Maps: Iowa

2018. Iowa Department of Natural Resources. Topographic Maps Each zip file contains a MrSid compressed image of the topographic quads of a certain Iowa county.

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Image

Historical Aerials: Center County, Pennsylvania, 1938

2018. Centre County Aerials 1938 from the Penn Pilot Program.

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Image

Historical Aerials: Center County, Pennsylvania, 1957

2018. Centre County Aerials 1957 from the Penn Pilot Program.

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Historical Aerials: Center County, Pennsylvania, 1971

2018. Centre County Aerials 1971 from the Penn Pilot Program.

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Land Cover by HUC 10: Pennsylvania

2018. Pennsylvania Land Cover by Hydrologic Unit Code (HUC) 10, Based on NLCD 2011.

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Land Cover by HUC 12: Pennsylvania

2018. Pennsylvania Land Cover by Hydrologic Unit Code (HUC) 12, Based on NLCD 2011.

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Land Cover Change by HUC 8: Pennsylvania

2018. Pennsylvania Land Cover by Hydrologic Unit Code (HUC) 12, Based on NLCD 2011.

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Land Cover Change by Pennsylvania County 1992 - 2011

2018. Land Cover Change by Pennsylvania County, Includes change from 1992 - 2011, 2001 - 2011, 2005 - 2011.

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Land Cover Change by Pennsylvania Major River Basin 1992 - 2011

2018. Land Cover Change by Pennsylvania Major River Basin change includes 1992 - 2011, 2001 - 2011, 2005 - 2011, Change is focused on Percent Forest, Per...

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Land Cover Change by Pennsylvania Physiographic Provinces change includes 1992 - 2011

2018. Land Cover Change by Pennsylvania Physiographic Provinces change includes 1992 - 2011, 2001 - 2011, 2005 - 2011, Change is focused on Percent Fores...

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Land Cover Change by Pennsylvania Physiographic Sections change includes 1992 - 2011

2018. Land Cover Change by Pennsylvania Physiographic Sections change includes 1992 - 2011.

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Latitude-Longitude Index Grid Edges: Prince George's County, Maryland

The Maryland-National Capital Park & Planning Commission.

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Latitude-Longitude Index Grid Points: Prince George's County, Maryland

The Maryland-National Capital Park & Planning Commission.

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LiDAR Dates: Iowa

2018. Collection dates for individual tiles.