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You searched for: Subject Imagery and Base Maps Remove constraint Subject: Imagery and Base Maps Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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21.
Raster

Chesapeake Bay Watershed Land Cover Data Series 1984 penn-state

1984. 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...

22.
Raster

Chesapeake Bay Watershed Land Cover Data Series 1992 penn-state

1992. 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...

25.
Raster

Digital Orthophoto (DOQQ - quarter-quadrangle) for Delaware 1992 penn-state

1992. United States Geologic Survey (USGS) and Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...

26.
Raster

Digital Orthophoto (DOQQ - quarter-quadrangle) for Delaware 1997 penn-state

1997. United States Geologic Survey (USGS) and Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...

27.
Raster

Digital Orthophoto (DOQQ - quarter-quadrangle) for West Virginia 1997 penn-state

1997. United States Geologic Survey (USGS) and Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...

30.
Raster

Digital Orthophoto Quarter Quadrangle images for Pennsylvania penn-state

1999. United States Geologic Survey (USGS) and Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...

31.
Raster

Digital Orthophoto Quarter Quadrangle images for Pennsylvania penn-state

1993. United States Geologic Survey (USGS) and Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...