Retrieval of atmospheric water vapour from MOS-B imagery

As part of an effort to investigate the use of MOS-B imagery for land applications atmospheric water vapour was retrieved from MOS-B imagery. The atmospheric precorrected differential absorption (APDA) retrieval algorithm employs narrow spectral bands centered at 870, 940 and 1010 nm and a database with radiative transfer calculations. Maps of water vapour column were derived for multitemporal MOS-B scenes acquired in 1996. The comparison with water columns based on local radiosonde soundings agrees within 10 - 20 per cent

Remote Sensing vegetation status by Laser-induced Fluorescence

In November 1989 the EUREKA project LASFLEUR (EU 380) started as an European research effort to investigate the future application of far-field laser-induced plant fluorescence for synoptic, airborne environmental monitoring of vegetation. This report includes a brief introduction in a theoretically approach for the laser-induced fluorescence signals of leaves and their spectral and radiometric behaviour. In addition, a detailed description of the design and realization of the second generation of the far-field fluorescence lidar (DLidaR-2) is given with special regard to the optical and electronical setup, followed by a short explanation of the data processing.The main objectives of the far-field measurements are to demonstrate the link between laser-induced fluorescence data and plant physiology and to show the reliability of remote single shot lidar measurements. The data sets include the typical daily cycles of the fluorescence for different global irradiation. As expected from biophysical models, the remotely sensed chlorophyll fluorescence is highly correlated with the carbon fixation rate, while the fluorescence ratio F685/F730 is only dependent on the chlorophyll concentration. Drought stress measurement of evergreen oaks Quercus pubescens confirm the findings of healthy plants with regard to the fluorescence ratio F685/F730 while the fluorescence signals of stressed plants show a different behaviour than nonstressed plants. Additionally, the corresponding physiological data (porometer and PAM data) are presented