| 大规模三维植被场景实时可视化方法 |
| |
| 引用本文： | 韩秀珍,谭继强.大规模三维植被场景实时可视化方法[J].地理研究,2012,31(3):565-577. |
| |
| 作者姓名： | 韩秀珍 谭继强 |
| |
| 作者单位： | 1. 中国气象局国家卫星气象中心, 北京 100081;
2. 武汉大学测绘遥感信息工程国家重点实验室, 武汉 430079 |
| |
| 基金项目： | 中国气象局小型基建项目(200110804);中国气象局关键技术项目(CMAGJ2011M64);国家发改委项目(JCXXK-HT2009-017-02);公益性行业(气象)科研专项(GYHY(QX)2007-6-7) |
| |
| 摘 要： | 采用L系统结合野外观测数据来构建植被单体的三维结构模型,根据植被模型特点,分别对枝干和树叶两个组成部分进行几何简化,大幅度减少模型所需的几何要素数量。在冠层模型简化中,提出了分层LOD模型提取方法,该方法可以高效提取出多复杂度的冠层LOD模型,同时保证组成LOD模型的每片叶子都符合最小化误差方程的要求。在实时渲染过程中...
|
| 关 键 词： | L系统植被 动态LOD 几何简化 森林场景 |
| 收稿时间： | 2011-08-18 |
| 修稿时间： | 2011-12-24 |
A real-time visualization method for large 3-D vegetation scenes |
| |
| HAN Xiu-zhen,TAN Ji-qiang.A real-time visualization method for large 3-D vegetation scenes[J].Geographical Research,2012,31(3):565-577. |
| |
| Authors: | HAN Xiu-zhen TAN Ji-qiang |
| |
| Institution: | 1. National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China;
2. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan 430079, China |
| |
| Abstract: | This paper addresses an approach for dynamic and continuous multi-resolution visualization of large forests.Firstly,the approach uses the L-systems to generate 3D tree models,which are composed of two kinds of geometric elements: branches and leaves.The plants are simplified respectively to multi-resolution models of branches and foliage by our method.Secondly,the approach quantifies the resolution of LOD models by the length of branches and the quantity of foliage.The branch length for the branch LOD model and the leaf quantity for the foliage LOD model are obtained by the decay factor.Taking the values as the criterion,we extract LOD models from the multi-resolution models of branches and foliage in real time.Finally,we render the forest scene.This paper presents a continuous LOD rendering for forest landscape,and the main originalities of our method are summarized as follows.(1) To improve the efficiency for extracting the continuous LOD models,the multi-resolution chains and the binary tree structures are established respectively for the branches and the crowns,both of which consist of the preliminary models of the tree.(2) Our method for generating crown LOD models here shows that,they can implement large forest scene real-time visualization.(3) This paper makes new criteria for the LOD models,which use the decay factor to act on the original branch length and the original leaf quantity.In this way,the levels for displaying trunk and branches are calculated.This method is applicable to all kinds of plants with strong universality and practicability.So how to simplify crowns of such kind of trees is another important research subject.In future work,we should combine geometry-based and image-based simplification methods to further speed up visualization of large plant scenes. |
| |
| Keywords: | L system vegetation dynamic LOD geometrical simplification forest scene |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地理研究》浏览原始摘要信息 |
| 点击此处可从《地理研究》下载免费的PDF全文 |
|
