Aerofoto tasapinnaline ristkoordinaatide süsteem konstrueeritakse, lähtudes kaamera optilisest teljest, mis läbib perspektiivi tsentri ja ristub pildi tasapinnaga aerofoto peapunktis.
The exact center of an aerial photograph is called the Principal Point. The Principle point is the pointon the ground located immediately below the camera lens looking down vertically.
