DOQQ, or digital orthophoto quarter-quadrangle, is an extremely high resolution aerial photograph, taken from a plane or satellite in the infrared spectrum. Then it is digitalized at a very high resolution to create an image of incredible accuracy. These images are very useful because they are proportional and georeferenced, so they are as accurate as if you were viewing the image. Below is an example in works with ArcMap.
Found - www.pasda.psu.edu
This blog is a map catalog in which I am displaying fifty different types of maps and a tid-bit of information that looks into the purpose of the map!