SPOT absolute and multitemporal calibration is achieved using the on-board lamp plus regular checks over White Sands or other test sites which radiance is derived from ground measurements during the satellite overpass. In order to develop another independent method to monitor the long term evolution of the cameras sensitivity, systematic acquisitions of stable desert areas have been decided. The choice of the sites have been made based upon stability studies on images of large field of view satellites (METEOSAT and AVHRR). We now dispose of more than two years of systematic SPOT2 observations over three north Africa areas for all the modes of the two cameras, plus some SPOT1 acquisitions. For the time being, only four sites have been processed (acquired in (Chi) s mode by the HRV1 camera). The first results are promising and show: (1) a good stability of the sites (specially in (Chi) s2), (2) a good agreement with the on-board lamp, (3) a good consistency between SPOT1 and SPOT2 calibration.

Date Published: 15 November 1993
PDF: 10 pages
Proc. SPIE 1938, Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data, (15 November 1993); doi: 10.1117/12.161572

Published in SPIE Proceedings Vol. 1938:
Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data
Pat S. Chavez Jr.; Robert A. Schowengerdt, Editor(s)