SPOT5 geometric image quality

SPOT5 geometric image quality´s point is different from other SPOT satellites: with improved location accuracy, resolution and stereoscopic acuity, the challenge is not only to fulfill specifications but also to get a geometrically optimized system. That´s why a phase of fine geometrical calibration was carried on during SPOT5´s first year in orbit, in the continuity of first two months commissioning phase. This paper deals with improvements realized during optimization phase: first, each detection line´s absolute calibration of viewing angles has been processed; second, continuous calibration sites observations have been carried on allowing location performances´ improvement.