Keywords: Photographic target.svg Sweden nailed onto wooden sticks Photographic targets are used as reference points in aerial surveying to tie photogrammetrically produced coordinates to a coordinate system on the ground flygfotografering för att kunna knyta fotogrammetrisk framställda koordinater till ett koordinatsystem på marken own Johan Gustafsson 2009-07-19 KJG2007 Photogrammetry |