Digital Orthoimagery Quarter Quadrangles are aerial photographs in which distortion caused by normal aerial photographs such as relief displacement and camera angle are removed using computer technology. This allows the image to be used as a reliable map for calculating distances, angles...etc. The map shown is a DOQQ of Cole County, Il. Though digitally altered, this map could still be partially considered a black and white aerial photo and a hypsometric map.http://images.google.com/imgres?imgurl=http://www.isgs.uiuc.edu/nsdihome/webdocs/doqs/images/charleston_q30.jpg&imgrefurl=http://www.isgs.uiuc.edu/nsdihome/webdocs/doqs/info.html&usg=__3exLHXE9KCPM-Pxr8D73SaH2WDw=&h=380&w=642&sz=144&hl=en&start=5&um=1&itbs=1&tbnid=1yUx6rHBhlrQVM:&tbnh=81&tbnw=137&prev=/images%3Fq%3Ddigital%2Borthoimagery%2Bquarter%2Bquadrangles%26um%3D1%26hl%3Den%26sa%3DN%26gbv%3D2%26tbs%3Disch:1
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