数字区调中大型三维地形实时绘制方法的实现  

The realization of ROAM algorithm for large-sized 3D terrain rendering in digital regional geological survey

作　　者：徐凌[1] 杨武年[1] 濮国梁[2] 

机构地区：[1]成都理工大学遥感与GIS研究所,成都610059 [2]北京大学遥感所,北京100871

出　　处：《测绘科学》2007年第2期149-150,182,共2页Science of Surveying and Mapping

基　　金：国土资源部2000年重大科技项目"区调填图新技术新方法集成示范"之"青藏高原遥感;正射遥感影像制图新技术新方法区调应用示范研究"子课题(2000201-1)

摘　　要：数字化区域地质调查需要更多信息丰富、直观的表现形式,以更大程度辅助区调填图,并作为最终的载体,生成满足相关领域需求的实地三维模型。本文以区域地质调查中所采用的规则网格数字高程模型为基本数据,采用视域相关的细节层次(LOD)网格优化技术,并选用ROAM实时自适应算法,兼顾不同地物的重要程度,选择相应的细节层次,以期通过减少绘制单元总数量,提高系统运行效率。In order to assist regional geological mapping,the Digital Regional Geological Survey(DRGS)needs more abundant and visualized expression forms,so the 3D terrain model is adopted as the carrier for the demands in many correlative fields.Based on the regular grid DEM(Digital Elevation Model)in DRGS,ROAM(Real-time Optimally Adapting Meshes)algorithm is used to create dynamic model,which can give consideration to the importance of different features and select correspondence level of detail.How to reduce the total number of detail units and improve the system efficiency is the purpose to use the ROAM arithmetic.The realizing of the whole algorithm indicates that a better effect has already been required.

关 键 词：数字区调 大型三维地形 地形可视化 ROAM 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]