Figure 3. True Orthophoto of the city of Graz, 400 m × 400 m, at a ground sampling distance of 10 cm. ―True‖ in that orthophoto implies the aerial photograph has been re-projected considering the elevation of the buildings, so that one cannot see any of the building facades. Shown here are 216 building details: Brockmanngasse, Kopernikusgasse; UltraCamX, acquired in 2007 [Courtesy of Microsoft-Graz].