Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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61.
Aggregate resources inventory, Twin Cities Metropolitan Area, Minnesota, IC-20, Plate 2

Aggregate resources inventory, Twin Cities Metropolitan Area, Minnesota, IC-20, Plate 2

1984. Meyer, Gary N. and Jirsa, Mark A. Bedrock (crushed rock) aggregate resources, geologic map units, seven county metropolitan area, Minnesota, scale 1:250,000.

62.
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Agricultural security areas: Pennsylvania

1996. Penn State ORSER/ERRI. Agricultural security areas from LLRWS data.

63.
Agriculture Census: Indiana

Agriculture Census: Indiana

1997. United States Geological Survey. USGS National Atlas metadata states "This data set portrays the National Agricultural Statistics Service, U.S. Department of Agriculture's 1997 Ce...

64.
Airdevronsix Icefalls: Antarctica

Airdevronsix Icefalls: Antarctica

Jean-Claude M. Thomas. Projection: Lambert Conformal Conic Projection - Standard Parallels -76°40' and -79°20'; Series: USGS Satellite Image Maps.

65.
Alexandra Mountains: Antarctica

Alexandra Mountains: Antarctica

Projection: Lambert Conformal Conic Projection: Standard Parallels -76°40' and -79°20'; Series: USGS 1:250,000 Topographic Reconnaissance Series.

66.
Alexandra Mountains: Antarctica

Alexandra Mountains: Antarctica

Wade; Cathey; Oldham. Projection: Lambert Conformal Conic Projection: Standard Parallels -76°40' and -79°20'; Series: USGS 1:250,000 Geologic Reconnaissance Series.

67.
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Ambient and fixed station network groundwater monitoring point data (1985 - 1998): Pennsylvania

1999. PA Department of Environmental Protection. This coverage represents the point locations and data for 1,106 groundwater quality monitoring points sampled under the PA DEP Fixed Station Networ...

68.
Vector Created with Sketch.

Annual Average Daily Traffic (AADT) Turning Traffic 1999: Iowa

1999. Iowa DOT GIS Services. Iowa turning traffic data (AADT) for intersections on the primary, secondary and municipal roadway systems for 1999. The state is divided into 4 qu...

69.
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Annual Average Daily Traffic (AADT) Turning Traffic: Iowa, 1998

1998. Iowa DOT GIS Services. Iowa turning traffic data (AADT) for intersections on the primary, secondary and municipal roadway systems for 1998. The state is divided into 4 qu...

70.
Antarctic Exploration and Claims: As of 1 February 1956: Antarctica

Antarctic Exploration and Claims: As of 1 February 1956: Antarctica

1956. Downloaded from CIA Flickr page: https://www.flickr.com/photos/ciagov/albums/72157674885572481/with/30252922504/; Series: CIA Declassified Maps.

71.
Archived Land Use Land Cover 1973: Maryland

Archived Land Use Land Cover 1973: Maryland

1973. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. This layer contains land use land cover information for the ye...

72.
Archived Submerged Aquatic Vegetation - SAV 1984: Maryland

Archived Submerged Aquatic Vegetation - SAV 1984: Maryland

1984. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV Coverage was mapped from 1:24,000 black...

73.
Archived Submerged Aquatic Vegetation - SAV 1985: Maryland

Archived Submerged Aquatic Vegetation - SAV 1985: Maryland

1985. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

74.
Archived Submerged Aquatic Vegetation - SAV 1986: Maryland

Archived Submerged Aquatic Vegetation - SAV 1986: Maryland

1986. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

75.
Archived Submerged Aquatic Vegetation - SAV 1987: Maryland

Archived Submerged Aquatic Vegetation - SAV 1987: Maryland

1987. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

76.
Archived Submerged Aquatic Vegetation - SAV 1989: Maryland

Archived Submerged Aquatic Vegetation - SAV 1989: Maryland

1989. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

77.
Archived Submerged Aquatic Vegetation - SAV 1990: Maryland

Archived Submerged Aquatic Vegetation - SAV 1990: Maryland

1990. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

78.
Archived Submerged Aquatic Vegetation - SAV 1991: Maryland

Archived Submerged Aquatic Vegetation - SAV 1991: Maryland

1991. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

79.
Archived Submerged Aquatic Vegetation - SAV 1992: Maryland

Archived Submerged Aquatic Vegetation - SAV 1992: Maryland

1992. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

80.
Archived Submerged Aquatic Vegetation - SAV 1993: Maryland

Archived Submerged Aquatic Vegetation - SAV 1993: Maryland

1993. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...