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Proceedings Paper

SPOT Radiometric Resolution Performance Evaluation: Preliminary Results
Author(s): G Begni; M Leroy; M Dinguirard
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Paper Abstract

The radiometric resolution of SPOT imagery is limited by two independant phenomena : -the instrument noise generated along the image columns by the CCD arrays detectors, the electronics and the quantization process -the equalization defaults due to the fact that each CCD array detector has a different sensitivity and dark current This effect is taken care of by image radiometric preprocessing at the ground segment level ; the residual errors and imperfections may be considered as an additional noise generated along the images lines. During SPOT post launch performance assessment, the noise along columns is estimated by recording the signal delivered by an onboard calibration lamp on each detector over a several seconds period. The determination of the so-called "relative calibration coefficients" which permits the equalization preprocessing is made by analyzing the signal delivered by the calibration lamp The calibration device is designed so as to project the light of the reference lamp onto the detectors through the whole telescope optics. The characteristics of this device are measured on ground and controlled after launch by testing several technological parameters. An independant estimation of these calibration coefficients can be made by imaging areas of high and uniform reflectance such as large and flat snowy surfaces. This paper presents the results of these various investigations.

Paper Details

Date Published: 25 November 1986
PDF: 6 pages
Proc. SPIE 0660, Earth Remote Sensing Using the Landsat Thermatic Mapper and SPOT Sensor Systems, (25 November 1986); doi: 10.1117/12.938569
Show Author Affiliations
G Begni, Centre National d'Etudes Spatiales (France)
M Leroy, Centre National d'Etudes Spatiales (France)
M Dinguirard, Centre d'Etudes et de Recherches de Toulouse (France)

Published in SPIE Proceedings Vol. 0660:
Earth Remote Sensing Using the Landsat Thermatic Mapper and SPOT Sensor Systems
Philip N. Slater, Editor(s)

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