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The scope of this paper is to summarize previous research pertaining to the use of digital elevation models (DEMs) and digital terrain models (DTMs) in the study of rockfalls and landslides.
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The free and easy-to-use method proposed here can provide an intuitive basis for hazard assessment and rapid responses to geological disasters. The comparison of the study case with field survey data proves the validity of the proposed method as it describes the real terrain shape and determines the slide distance accurately, although the elevation error may be large. 3D visualization of the temporal-spatial dynamic process of a natural disaster was carried out by combination of the numerical results and GE imaging. In this paper, the Donghekou landslide-debris flow triggered by the 2008 Wenchuan earthquake was selected as a case study. Terrain information can be extracted efficiently and freely from GE using an application programming interface (API) and then used to generate DEM.
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The emergence of the virtual earth platform of Google Earth (GE) provides new possibilities for generating terrain models.
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For example, historical topographic maps exist mostly in paper format, which is not conducive to spatial analysis, while interpretation of remote-sensing images generally requires professional knowledge at a high cost. The method proposed in this study may solve some limitations existing in other more traditional methods. Based on the terrain model, numerical simulations can be conducted and the results integrated with virtual earth to perform 3D visualization and visual analysis. The main aim of this study is to propose a low-cost and efficient method based on virtual earth to generate a three-dimensional (3D) DEM. Generating digital elevation model (DEM) for such geological disasters allows the rapid identification of affected areas, which is essential for emergency response and hazard mitigation. Sudden large-scale geological disasters can be triggered in mountainous areas by events such as earthquakes, rainfall, volcanic eruptions, or human activity, leading to serious loss of life and property.