Digital Orthophoto Quarter Quadrangle (DOQQ) Map

A DOQQ maps are pixel-based images of an aerial photograph with photographic characteristics as well as geometric qualities. This particular map is a digital flood insurance rate map in Lago Vista, Texas. 

http://www.crwr.utexas.edu/gis/gishydro00/Class/trmproj/Donnelly/termproject.htm