Research on 3D Model for Nature Environment and Roam of Large-Scale Terrain

Adaptive Block Tree is proposed to build the model for three dimensional spatial data of nature environment. Aiming at the disadvantage of ABT model, a mixed model of ABT model and TEN model is provided. The mixed model can not only integrate with TIN model but also describe the edge of the nature phenomena. In order to solve the data vacuity in the process of flyover, a vision dependence micro-terrain choice algorithm is given. This algorithm avoids the phenomena of vacuum and vision popping.