IN与GRID混合模型创建三维地形

his article has a deeply analysis for creating 3D terrains by two main DEM models TIN and GRID, analyzing the sampling points’ traits of the two models, their own advantage and disadvantage and their data structures. Basing on this join the two methods together, finding a mixed model, resolving the problems in single model. This article amply discusses the steps of creating mixed model, calculating terrain complexity, data structure of mixed model and algorithm of building Triangulated Irregular Network. At last, through a mass of tests, it proves that mixed model makes a good balance between complexity of data store and accuracy of terrain simulation, brings plentiful advantage to creating 3D terrain.