Orthophoto
Orthophotos are aerial photographs or digital versions of these photographs that have been "orthorectified" using ground elevations data to correct displacements caused by differences in terrain relief and camera tilt. The process gives an orthophoto the accuracy of a map. Because aerial photographs show the texture of the ground in much greater detail than do maps, orthophotos are useful for updating maps and for studying surface features not necessarily visible in maps.
Notice the water tower on the left is an oval, while the orthophoto on the right shows the tower as circular (as it really is).
