摘要
为了使可视域分析结果在3D GIS中显示以方便用户使用,探讨了在规则DEM数据基础上三维地形的显示手段,分析了观察点的拾取、可视域的分析及结果显示的方法.其中观察点的获取采用Java3D拾取技术;可视域分析采用参考面法得到可视点;分析结果显示是按照地形的起伏、在地形上方以半透明的方式来显示可视区域.仿真结果表明,这种方法对可视域分析结果描述准确,且对原地形的显示效果和交互操作影响较小.
In order to display 3D terrain viewshed analysis result in 3D geographic information system （GIS） and make it convenient for the user, the 3D terrain displaying on the basis of the regular digital elevation model （DEM） data was discussed. The methods for the picking up of the observation point, 3D terrain viewshed analysis and result displaying were presented. The Java3D picking up technology was used to obtain the observation point, and the reference plane algorithm was used to obtain the view point in viewshed analysis. The analysis result was displayed in accordance with the 3D terrain fluctuation, where the view area was revealed on the upside of the terrain in a translucence mode. The simulation results show that this method can exactly describe the viewshed analysis result and has less influence on the initial terrain displaying effect and interactive operation.
出处
《沈阳工业大学学报》
EI
CAS
2009年第4期458-461,共4页
Journal of Shenyang University of Technology
基金
辽宁省科技厅科技攻关资助项目(2002216008)
关键词
三维地形
数字高程模型
可视域分析
拾取
三维地理信息系统
交互
可视化
显示技术
3D terrain
digital elevation model
viewshed analysis
picking up
3D geographic information system
interactive
visualization
display technology
