摘要
与二维GIS相比,3DGIS对客观世界的表达能给人以更真实的感觉,它以立体造型技术给用户展现地理空间现象,而大地形建建模又是3DGIS研究的一项重要内容,所以如果能够很好地解决大地形建模问题,将会使3DGIS的研究更加深入。在详细分析了地形模型数据库的结构和建模两个方面存在的主要问题之后,以空间数据库查询的优化方法以及开发软件支持的纹理数据格式要求对大地形建模进行了优化分析,并以一个实例说明了采用上述两方面优化后,对于模型数据量的影响很大,所建模型相对占用资源较少,且可以满足不同层次显示要求,从而较好地解决了3DGIS研究中大地形模型海量数据的处理问题。
Compared with the 2DGIS, the 3DGIS can give people a better sense about the objective world, and it shows the geographical space phenomenon to the customers by the technology named solid structure. Because the large terrain modeling is one of the most important aspects in study of 3DGIS, if the problem of terrain modeling could be solved very well, it will deepen the research in 3DGIS. When the main problems of the structure of the terrain model database and the modeling were analyzed carefully, the large scale terrain modeling was discussed with optimized space dada base query methods and the texture formation demands which are supported by the development software. And then with an example it can be confirmed that the data quantity was affected thoroughly with the two aspects of methods, and that the model consumes less resource, which can satisfy the showing demand for different levels.
出处
《计算机仿真》
CSCD
2007年第7期195-197,共3页
Computer Simulation
关键词
地形建模
细节层次
单元分割
外部引用
三维地理信息系统
Terrain modeling
Level of detail
Cell aegmentation
External reference
3 D geographic information system
