参数化林木个体及林分场景可视化模拟技术
Visual Simulation of the Parameterized Tree and the Stand Scene
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摘要: 以湖南攸县黄丰桥国有林场为试验区，以1块林分边界规整的典型杉木人工同龄纯林为研究对象，测定林木胸径、树高、冠幅、冠高与活枝下高等测树因子及林木位置信息。研究冠形曲线函数，利用Direct 3D技术，实现冠形控制下的参数化林木模拟。研究林木模型格式转换方法，为林分场景构建提供模型数据，结合MOGRE技术，研究林分场景模拟技术方法，实现林分场景可视化模拟。结果表明：参数化林木个体建模算法简单适用，测树因子信息可直接用于林木个体可视化模拟，所建模型可体现林木个体差异，形态逼真；利用MOGRE技术可快速、有效模拟林分场景，所建场景真实感较强。此方法所需数据易于获取，适用性强，可对林木个体及林分场景进行逼真模拟，可为研究林木竞争关系、林分生长、林分结构与林分经营提供新思路。Abstract: The Huangfengqiao State-owned Forest Farm in Hunan Province was selected as a test area. A typical even-aged Chinese fir pure plantation with regular boundary was chosen as the research object. The tree height, DBH, crown width, crown height, under-branch height and the tree location information were measured. The parameterized tree controlled by the crown shape was simulated by researching the crown shape function and using the Direct 3D technique. The conversion method of the tree model format was studied in order to provide the model data to the stand scene. The simulation method of the stand scene was researched and the stand scene was simulated by using MOGRE technique. The results show that the simulation algorithms of the parameterized tree are simple and applicable, the tree-measuring factors can be directly used by the verisimilitude model of the tree which can describe the individual difference, and the verisimilitude scene can be quickly and effectively constructed with MOGRE technique. The data can be easily acquired and the methods which have strong applicability can realistically simulate the individual tree and the stand scene and provide new ideas for the study of forest competitive relationship, stand growth, stand structure and stand management.
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Key words:
- parameterization
- / individual tree
- / stand scene
- / MOGRE
- / visual simulation
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