The mutual effect of economical activities, tourism and landuse on the state of the natural system were studied in a testsite around Davos,Â· Switzerland. In a first step, field work was carried out to yield a reliable data base. The multidisciplinary venture covered various fields including geomorphology, soil science, climatology, geobotany, forestry, game biology and landscape history. All spatial information was collected in a Geographical Information System (GIS). Image processing techniques were extensively used to digitize the incoming survey maps and to control the consistency of the data. On the basis of a mathematical model natural elements such as soil type, vegetation type, agricultural yield, game dispersal, avalanche hazard, etc. have been simulated. Furthermore, several scenarios have been investigated showing contrasting concepts for landuse. This resulted in a series of thematic maps (e.g. productivity, avalanche hazard maps). These maps can be displayed for interactive examination using digital image processing facilities.