This is a Digital Ortho Quarter Quads (DOQQ) map. DOQQs are digital aerial images produced by the United States Geological Survey (USGS). These maps can be found for every state and are organized by county (most of the time). These maps contain orthorectified aerial photography at a resolution of 1 meter. Image displacements caused by the tilt of the camera and terrain relief are removed from the derivation from a digitized perspective aerial photograph. This DOQQ is of Tennessee.
