Digital Orthophoto Quarter Quads, or DOQQs, are aerial images produced by the USGS that have been post processed and orthorectified to a resolution of 1-meter. This process eliminates planular distortion. This DOQQ shows a bottleneck forming in the middle of a river. DOQQ's are used frequently in GIS projects for easy georeferencing. This is a procedure used for change over time analysis such as shoreline change or river bank formation.
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