Item: The solid ortho-image: a new tool to identify avalanche terrains
Title: The solid ortho-image: a new tool to identify avalanche terrains
Proceedings: International Snow Science Workshop, Davos 2009, Proceedings
Authors: Danilo Godone¹, Margherita Maggioni², Michele Freppaz² 1 Turin University D.E.I.A.F.A., Grugliasco, Italy 2 Turin University Di.Va.P.R.A., Grugliasco, Italy
Abstract: In mountain areas the correct identification of avalanche terrains is mandatory in order to avoid, or at least prevent, avalanche accidents in inhabited areas. Moreover, the localization of these terrains is also useful in remote areas with the purpose of increasing the overall knowledge of the investigated territory and in the prevention of avalanche accidents during tourist or generally outdoor activities. Generally, the identification of avalanche terrain in large areas is carried out through stereovision devices with aerial images. This approach needs the use of specific software and hardware in order to accomplish the analyses in the best way. The solid ortho-image is a new image that can improve terrain analysis allowing the operator, whether skilled or not in photogrammetry, to accomplish complex analysis. The solid image conjugates in a unique support the chromatic information of a traditional photogram and the three-dimensional one of a digital terrain model. By moving the cursor on the image the operator is thus able to spot avalanche terrains by image interpretation but is also helped by the three-dimensional content of the support; the final output is a 3D plotting of avalanche areas. These data can be directly employed in avalanche mapping or as input in avalanche modelling.
Keywords: image analysis, land planning, avalanche hazard, geographic information systems (gis)
Digital Abstract Not Available