期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1998
卷号：XXXII Part 1
页码：14-19
出版社：Copernicus Publications
摘要：For the radiometric calibration of the MOMS-2P camera on board of the Russian MIR-station an inflight sun calibrationmethod using a diffuser plate in front of the optics is applied . By tilting the diffuser plate by 20 degrees with respect to theentrance optics the direct sunlight is reflected into the optics. Prior to the absolute rad iometric calibration of every pixel theimage has to be corrected for relative radiometric disturbances along the scan lines. The reasons are the odd/even effectand the CCD typica l non-uniformity. To correct for these effects relative calibration tables, derived from the diffuser plateca libration, are appl ied to the image. The applicability and stabil ity of these tables is only given to an accuracy of about 1-2%in the nomina l case. Therfore the remain ing disturbances, probably caused by deficiencies of the internal electronic amplifiercircuits and temperature va ri ations, are removed using empirical methods. To correct for these random type of image fai lures,a digital filter in the spatial domain was developed. It is based on an averaging technique that acts in a large kernel size. Sincethere seems not to be complete linearity for very high and very low brightness levels, these levels have to be excluded from theaveraging procedure. The image contrast and information content is less influenced than with other known fi lter techniques.In this paper the procedure to derive the level LlA Data is shown . After correcting for the relative radiometric differences themeasured solar irradiance values can also be used for absolute calibration because the extraterrestrial spectrum of the sun isvery well known . The methods to derive the absolute cal ibration factors are described and first results are presented
