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GIS-based Simulation of Soft Geo-objects

To simulate dynamic soft geo-objects and reflect geoscientific laws, the authors discuss the characteristics, mathematical expression, parameter representation and rendering of GIS Flow Element (FE) and GIS Soft Voxel (SV). The simulation and rendering algorithms of GIS FE and GIS SV are based on particle system and metaball technology in computer graphics. The main differences are that GIS FE and GIS SV have definite geoscientific meaning and they are simulated based on geoscientific models so they can well represent geoscientific characteristics of simulated objects. Compared to traditional GIS modeling approaches such as TIN, grid, tetrahedron, octree and others, this approach is more convenient, realistic and efficient in simulating dynamic soft geo-objects. This paper selects the simulation of soil erosion process on hillslopes as a case study, and proves that the approaches of GIS FE and GIS SV can enrich the capability of GIS. Therefore, they have the potential for widely practical use.