3D Terrain Multi-resolution Modeling And Precision Evaluation

3D terrain multi-resolution modeling is one of the kernel technologies in virtual scene simulation. The modeling precision not only affects the fidelity of visualization, but also restricts the analysis and decision-making based on models. In this paper, we researched the theories and methods on the weakness in multi-resolution modeling systemically. The following contents are included.(a) We summarized the theories and methods in 3D terrain multi-resolution modeling and precision evaluating, at the same time, advanced a method of the quantitative description of multi-resolution.(b) We designed and realized a Tin multi-resolution modeling method based on vertex importance. From analysis to the experiments, we obtained the adaptability law of different vertex importance items, furthermore established the precision models of them.(c) We implemented a RSG multi-resolution modeling method based on quad-tree structure using wavelet transform theory. In this part, we introduced the principle of choosing wavelet function, means of conditional filtering, and method of most suitable triangle division to leaves of quad-tree in detail, at last found out the law of wavelet coefficients and effect of controlling factors to model.(d) We finished a validation system based on theory research combined with task demands, which is designed using object-orient method.The research in this paper not only provides theories and methods for 3D terrain multi-resolution modeling, but also offers scientific reference to develop similar research and control the quality of modeling. It is significant in theory and practice.