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《Geomatics World》 2010-02
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Key Technology with Large-scale Three-dimensional Terrain Management

DANG Zhou,LIU Qiang,ZHANG Wen-huo,YAN Bin,HU Yang(Institute of Geo-spatial Information Science and Technology,University of Electronic Science and Technology of China,Chengdu 611731,China)  
This paper describes the key techniques for constructing a large scale 3D terrain scene,including terrain segmentation,Level of Detail(LOD) construction,visibility culling,view-dependent rendering.This paper realizes the terrain multi-resolution representation by quad-tree for enhancing the frame rate and realizing the display smoothness and continuity of the large-scale scene walkthrough system;a reasonable node evaluation system is designed,which is based on the consideration of viewpoint and terrain roughness;for eliminating the cracks between the nodes of different resolution,restricted quad-tree triangulation method is put forward.The experiment result presents that the terrain visualization gets good rendering quality and displaying rate by the technology of this paper on the premise of keeping terrain photorealistic.
【CateGory Index】: TP391.41
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