摘要
根据高精度曲面建模理论(HASM)中曲面单元算法的特点,提出基于视点的多分辨率LOD实时生成算法。该方法通过对规则格网的DEM数据进行划分,以单元分片为基本单位对DEM数据进行组织。根据各曲面单元与视点的相对关系,以不同间距对曲面单元进行内插,实时重建视景内的三维地形。在实时显示过程中,对硬盘中的数据进行实时读取,采用多线程技术对图像渲染操作进行处理,实现了对DEM数据的实时计算、动态显示。该方法无需对规则格网DEM数据建立空间层次组织结构,在对虚拟地形进行实时漫游过程中,存储空间占用少,不受数据规模的影响。
A view-dependent and real-time LOD algorithm is presented, based on the algorithm of surface units in high accuracy surface model（HASM）. The grid data in DEM is divided into patches and organized in surface units. In the process of reconstruction of the virtual terrain for DEM, the surface units are interpolated at intervals in proportional to the distance between the units and the view point so that the LOD in the field of vision is produced in real time. The dynamic DEM data delamination and the scene of 3D virtual terrain are implemented by the method to reduce the consumption of system memory without building the hierarchical model for the regular grid DEM data.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2009年第1期64-67,71,共5页
Geomatics and Information Science of Wuhan University
基金
中国科学院知识创新工程重要方向资助项目(KZCX2-YW-429)
国家863计划资助项目(2006AA12Z219)
