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.



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.