The stereoscopic aerial flight has been conducted over the city centre of Ghent on 22 March
2000 at noon with a Wild RC20 photogrammetric aerial frame camera, equipped with a
30/4 NATA-F lens (f = 303 mm). The images are acquired at a flight height of approximately
1200 m, yielding a photo scale of 1:4000 and a resolution of 0.09 m ground space
distance (GSD).