Effects of Geo-atmospheric Preprocessing on Imaging Spectroscopy Data Quality and Methods

Advanced methods of geo-atmospheric preprocessing have become available in the past years and increasingly are applied to AVIRIS airborne imagery. Both, the geometric as well as the atmospheric part of the preprocessing have their specific impact on data quality which should be aware to scientists using such corrected data. An integral geoatmospheric correction has been developed in a joint effort by the Remote Sensing Laboratories of the University of Zurich and the German Aerospace Agency of Wessling, Germany. It combines the parametric orthorectification program PARGE (Schläpfer et al., 1998) with the atmospheric and topographic correction program ATCOR4 (Richter et al. 2000). The method has been successfully tested on AVIRIS and other airborne imaging spectrometry data such as DAIS, HyMap, and CASI. The method has been described in the abovementioned papers and thus is not further explained herein. In the following, two specific radiometric problems inhere to geometric as well as to atmospheric and topographic correction are explained and potential solutions are depicted.