地形信息的LoD建模及精度分析

对细节层次模型(LoD模型)不同层次之间的精度进行研究.提出用于分层的简化比率概念,建立表示LoD不同层次精度的分辨率误差模型,选取5种典型地貌区域进行实验,得到不同地貌区域的误差拟合公式.根据这些公式,可内插得到各种分辨率比率的误差.同时,利用逆公式,又能由误差确定相应的分辨率比率.最后,对不同地貌类型不同化简算法的模型化简误差进行分析研究.研究成果为评价LoD模型精度提供新的方法,也为简化DEM模型时选择适宜的分辨率提供科学依据.

LoD Modeling and Accuracy Analysis of Terrain Information

In this paper, the accuracy for level of detail (LoD) model in different level is studied. A concept that is called as simplifying rate is put forward to represent the simplified level of LoD model. And a resolution error model is built to show the accuracy of LoD model. By the built model, 5 kinds of typical relief regions are experimented. The approximation formulae are obtained for these regions. Based on the formulae, the error with any simplifying ratio can be gained by interpolation algorithm. On the other hand, the simplifying ratio can be determined according to the asked error. Finally, the resolution errors based on different simplification algorithms are studied. The results obtained in the paper supply not only a new approach for evaluating the accuracy of LoD model but also a science base for selecting feasible resolution of simplify DEM.