This black and white aerial photo was taken from: http://images.google.com/imgres?imgurl=http://digicoll.library.wisc.edu/wiacrev/data/images/V46/reference/WAR0460101502r.jpeg&imgrefurl=http://digicoll.library.wisc.edu/cgi-bin/wiacrev/wiacrev-idx%3Ftype%3DHTML%26rgn%3DDIV1%26byte%3D559340%26q1%3D%26q2%3D%26q3%3D&usg=__fSTWjXYcCTFuJGkuCqrLnb3q03I=&h=285&w=468&sz=18&hl=en&start=15&um=1&tbnid=d3MBWzi3pxDojM:&tbnh=78&tbnw=128&prev=/images%3Fq%3Dblack%2Band%2Bwhite%2Bariel%2Bphoto%26hl%3Den%26um%3D1. It depicts urban sprawl near the edge of Madison, Wisconsin, and was a method of early land mapping to aid the USGS in accurately mapping areas of the Earth.
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