Imaging Spectrometry as a tool in Limnology
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Keywords
Signature Analysis, Spectral Radiometry, Radiative Transfer Model, Airborne Campaign, Water Quality Parameters
Abstract
Limnological Systems are investigated by airborne (CASI, ROSIS & HYMAP) and spaceborne (MOS, SeaWiFS & MERIS) Imaging Spectrometers. One main goal will be the inversion of Radiative Transfer Models applied on in situ and remote sensed spectral data sets in order to receive information about water quality parameters (Chlorophyll a, Gelbstoffe, particulate suspended Matter). The use of remote sensed images also includes pre-proceding which has to be done with great care such as the removal of sun glitter or the determination of adjacency effects. Remote Sensed Data of Lakes can be used for the water quality controlling, the estimation of primary productivity, as check for 4-dimensional (x,y,z,t) lake models and many other applications. Geographic Areas of Interest are Lake Zug, Lake Lucerne, Lake Contance, and Lake Zurich. The project is funded by the Swiss National Research Foundation Project "Imaging spectrometry as a tool for environmental analysis".
Results
A first result of a generated chlorophyll a map using a semi-analytical model is shown in the figure below (Lake Zug, CASI, 10.8.1997). Though, most inland lakes are very well horizontally mixed, some structures are visible. For the generation of this map, a curvefitting method is used. This algorithm and the comparison with a matrix inversion method will be described in a submitted paper).