Electronic Performance of the Imaging Spectrometer ROSIS-03

Abstract

ROSIS is an airborne imaging spectrometer which has been primary developed for oceanographic and limnologic applications, but land monitoring has been aspired as well. For the detection of water constituents a high radiometric sensitivity is required, for small-scale monitoring of land features a high geometric resolution is necessary, and for studying of certain spectral features (e.g. chlorophyll fluorescence) both high radiometric and high spectral resolution is demanded. Since any instrument optimisation for the benefit of one demand is to the disadvantage of the others, the technical realisation was challenging. Since ROSIS met hitherto only the requirements for land monitoring, but not those for quantitative analyses of water constituents, the instrument electronics was replaced in 1997. This improved the electronic performance of ROSIS significantly. At the example of ROSIS various aspects of the radiometric calibration of a matrix-CCD-based instrument are discussed.