基于DEM的三维空间分析

使用可视化编程语言IDL开发了三维空间分析模块Analysis3D,系统实现了部分三维地理信息系统的功能,并进一步使三维地理信息系统迈向了虚拟现实。在系统的实现过程中利用IDL坐标系统的转换功能,成功地将外部数据可视化;实现了三维数据的实时获取,并解决了三维实体空间编辑与操作的实际问题,实现多视角多分辨率的观察。根据地理信息系统空间分析的相应算法,实现空间分析与立体量测,所有过程均在三维空间中完成;同时完成了三维空间中提取等高线,以及自动标注等高线功能。最后,实现了三维交互式浏览,得到良好的视觉效果。

Realization of 3D Spatial Analysis Based on DEM

Analysis3D was developed with IDL,and parts of 3D GIS function were systematically realized.3D GIS would further be closed to virtual reality.In the course of systematical realization,outer data were successfully visualized by using the converting function of IDL coordinate system.3D data were gained in real-time.And the edit and operation of 3D entity dimension were solved.It is more random to investigate 3D landform and realize the observation of multi-visual-angles distinguishable ratio.According to corresponding arithmetic,special analysis and solid measure were realized and every course was completed in 3D,which makes analytic result more visualize.At the same time,the contour lines were picked up in 3D and the function that the contour lines could be labeled automatically was completed.Finally,the study achieved interactive browser between 2D and 3D.