一种面向大场景3维显示的地形建模方法  

A Modeling Method for Large Scale Terrain Oriented 3D Display

作　　者：涂震飚[1] 刘永才[2] 苏康[2] 田金文[1] 

机构地区：[1]华中科技大学图像所图像识别与人工智能教育部重点实验室,湖北武汉430074 [2]航天科工集团第三研究院,北京100074

出　　处：《测绘学报》2004年第1期71-76,共6页Acta Geodaetica et Cartographica Sinica

基　　金：高等学校博士点基金资助项目(20010487030)

摘　　要：提出一种面向大范围3维场景显示的地形建模方法。该方法基于数字高程模型DEM(DigitalElevationModel)固有的栅格特点,将大范围场景划分成小的子块。根据应用对这些子块的精度要求,采用不同地形建模方法构建相应的细节层次LoD(LevelofDetail)模型。最终,通过拼接这些子块模型完成对整个大场景的多分辨率建模,试验结果表明,该算法具有较好的实用性和有效性。A modeling method for large scale terrain oriented 3D display is presented. Based on raster characteristics of DEM and image data, the large scale terrain is plotted into small sub-plots by this method,and the LoD terrain model as well as texture pyramid of these sub-plots are constructed separately, corresponding to practical appeal of the application. Ultimately, the entire multiresolution model of large scale terrain can be constructed by patch up these sub-model, furthermore, the real-time cruise of large scale 3D terrain can be realized.

关 键 词：数字高程模型 DEM 栅格 子块 地形建模 格网简化 3维可视化 

分 类 号：P232[天文地球—摄影测量与遥感]