Digital Terrain Models and their Usability to Landslide Risk Assessment and Visualisation
Publication from Digital
Hirschmugl M., Granica K., Proske H., Wurm M., Almer A., Schnabel T., Raggam J., Schardt M.
27th EARSeL SYMPOSIUM "GEOINFORMATION IN EUROPE", Milano 2007 , 2007
Digital Terrain Models (DTMs) are an important information source for many remote sensing and GIS applications. In this paper, the usability of DTMs from different sources for the mapping of landslide susceptibility as well as for visualisation purposes is evaluated. The work was done within the scope of the ASSIST (Alpine Safety, Security & Informational Services and Technologies) project and results
were exchanged over the GMOSS (Global Monitoring for Security and Stability) Network of Excellence. An Alpine testsite has been selected in a high mountain terrain near Landeck/Tyrol (Austria). This region
is prone to many natural hazards, i.e. landslides, floods and snow avalanches. A DTM with a spatial resolution of 25 m and a very high resolution LiDAR DTM offering a spatial resolution of 2 m were used
to identify geomorphometric parameters as indicators for landslide susceptibility mapping. Additionally to these indicators, also landcover information from a QUICKBIRD satellite image classification and geological
data extracted from a geological map are used in this testsite. The differences between the two DTMs in the context of assessing risk zones based on statistical models are evaluated and compared to visual
aerial image interpretation of risk zones. Additionally, a region in Kashmir was selected as a second testsite to evaluate the usability of a DTM derived from three SPOT5 scenes for the derivation of landslide
indicators. Furthermore, an overview is given on the usability of the different DTMs for geo-visualisation.