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3D simulation of soft geo‐objects

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In terms of geometry, existing approaches for 3D GIS modelling can be classified into three types: surface-based, volume-based, and hybrids. These approaches are suitable for representing rigid geo-objects, but so far there are no ideal GIS modelling methods for simulation of soft geo-objects such as flowing water and soil. In this study, a GIS flow element (FE) and GIS soft voxel (SV) were used for simulation of overland flow and soil erosion. The length of a GIS FE is directly proportional to the velocity of overland flow, while the inclination of a GIS FE represents the direction of overland flow. The GIS SV is generated by implicit functions, which can be utilized to create a smoothed surface. This study reveals that GIS FEs can realistically represent the dynamics and stochastics of soft geo-objects, while GIS SVs can simulate deformation of soft geo-objects. Moreover, both of these approaches can reflect geoscientific laws because the animation of 3D scenarios is controlled by geoscientific models.
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Keywords: 3D simulation; GIS flow element; GIS soft voxel; Overland flow; Soil erosion

Document Type: Research Article

Affiliations: Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611‐0011, Japan

Publication date: March 1, 2006

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