Imaging spectroscopy as a quantative tool for the retrieval of biogeophysical parameters

Abstract. Representing the dynamic character of Vegetation in global climate modelling is a challenging task. We present a new Instrumentation approach in the form of APEX, an airborne imaging spectrometer to address the key variables and processes relevant for monitoring the biogeophysical and biochemical parameters at the local, regional and national scale. We are able to demonstrate that a large number of relevant processes and variables have been monitored successfully using imaging spectrometers. In particular, the accuracy of the variable retrieval using this observational approach has much improved and the quantification of the interaction of the radiation field with Vegetation has been made possible. The airborne instrument APEX will be made available to the scientific Community in early 2005, whereas it's space successor SPECTRA is scheduled for launch in 2008. The inclusion of the spectro-directional and thermal components will contribute toward minimizing retrieval uncertainties. Until these instruments are introduced into the market, there is enough time to develop the necessary products and to inform the scientific Community about the new possibilities.