Seite - 498 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 4: Data and Workflow The evaluation of Landsat time series is of special interest. By analysing the landscape development over 40 years environmental changes and future trends become visible. The research is focussed on the detection of the snow cover size and distribution and monitoring of trends (Figs.5 and 6). Unfortunately, many scenes are covered by clouds. This is the reason, why seasonal change detections are not possible for every year. Although cloud covers are a limiting factor for the evaluation of Landsat data, enough data are available to detect seasonal variations and long-term changes. Snow covered areas are classified based on the Landsat- images and then the areas with snow and ice-covers are calculated. 498