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1. Cities, California, 2015

2015. Schwarting, Ric and California. Department of Transportation. This polygon shapefile contains the boundaries of cities in California as of 2015. This layer is an updated version of the 2012 layer. These data w... California. Department of Transportation.

2. United States Census Urbanized Areas, 2010

2013. U.S. Census Bureau. Geography Division and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts... Environmental Systems Research Institute (Redlands, Calif.).

3. United States National Atlas Urbanized Areas, 2001

2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This polygon shapefile represents urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). Data... Environmental Systems Research Institute (Redlands, Calif.).

4. World Urban Areas, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile contains the boundaries of urban areas with dense areas of human habitation worldwide derived from 2002-2003 MODIS satellite... North American Cartographic Information Society.

5. World Urban Areas, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile contains the boundaries of urban areas with dense areas of human habitation worldwide derived from 2002-2003 MODIS satellite... North American Cartographic Information Society.

6. World Urban Areas, LandScan, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts boundaries of urban areas with dense areas of human habitation worldwide. Regional significance is favored over popu... North American Cartographic Information Society.