实景三维模型数据几何精度降低算法

Geometric accuracy reduction algorithm for real scene 3Dmodel data

针对高精度的实景三维模型数据难以安全共享和公开的问题,该文从实景三维模型数据的组织结构特征和几何精度降低要求出发,分析了实景三维模型数据几何精度降低特征,提出了几何精度降低需求和几何精度降低评价指标;针对地物高度相对量测精度提出了一种基于乘法规则的三角函数几何精度降低算法。实验结果表明:该文所提出的算法能够达到降低精度要求,具有较高安全性且能够有效保持模型空间形态相似性和空间方向一致性,具备良好的实用性。

In response to the problem that high-precision real scene 3Dmodel data is difficult to share and disclose securely.This paper starts from the organizational structure characteristics and geometric accuracy reduction requirements of 3Dmodel data.The characteristics of geometric accuracy reduction of 3Dmodel data are analyzed.The demand and evaluation index of geometric accuracy reduction are put forward.Aiming at the relative measurement accuracy of ground object height,ageometric accuracy reduction algorithm of trigonometric function based on multiplication rules is proposed.The experimental results show that the proposed algorithm can meet the requirement of precision reduction.Moreover,it has good practicality and can effectively maintain the model spatial morphological similarity and spatial direction consistency.