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IAMG 2001--Cancún
Technical Program--Session F |
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New Digital Tools for Landslides Data Capture: The 3D Navigator
by Stefano Lo Russo, Politecnico di Torino--Dipartimento di Georisorse E Territorio, Italy, The evaluation of amounts of loose material transported by debris flow during extreme meteorological events is a fundamental device of back-analysis focused to risk assessment. Traditional approaches consist of historical-bibliographical research and expensive topographic surveys. The interpretation of slope movements from aerial digital images is based on recognition and identification of elements associated with slope movements and interpretation of their significance to the slope instability process. Stereophotomap and 3D Navigator are innovative digital photogrammetric tools that offer new opportunities in modelling and cartographic analysis of geological data and in particular in multi-temporal photointerpretation of landslides phenomena. The system is based on a photogrammetric station, named Stereospace, and on an "image database" named Stereophotomap. The user has access to all information offered by the images; he can select and measure what is of interest (X,Y,Z co-ordinates of points, distances, areas, volumes, etc.). The main advantages of this kind of approach are represented by the reduction of time consumed for data entry operations and by the certainty of location of the acquired data. In order to describe the features of these instruments, the authors show a practical application in two debris flow analyses conducted after the flood that occurred in the North-West of Italy during October 2000. |
