一种基于网格控制的三维MGIS符号动态建模方法

三维MGIS符号的动态建模是虚拟战场及军事地理信息系统的重要内容,对提高战场态势的直观性,增强辅助决策能力具有重要意义。提出了一种基于网格控制的三维MGIS符号动态建模方法,使用贝塞尔网格和DEM网格控制MGIS符号的三维形状。在建立MGIS符号层次数据结构的基础上进行空间剖分,形成空间逼近线段;通过空间曲面约束,有效控制空间形态;最后进行Delaunay三角网重构,从而得到三维空间中的动态模型。实验结果表明,该方法能够很好地控制三维MGIS符号的平面与空间形态,并能有效实现DEM地形跟随。

3D Military GIS Symbols Dynamic Modeling Method Based on Control Grid

It is one of the most important parts of the research on virtual battlefield and 3D MGIS (Military Geographic Information System) for 3D military GIS symbol modeling. A dynamic modeling method based on control grid was declared, and Bezier grid and DEM grid were used to control the military symbol model's 3D shape. The military GIS symbol was divided into several line segments according to its slope. Then, a Bezier grid was drawn around the symbol, when the Bezier grid was warped, the symbol would be projected into the grid, as well as the line segments were transformed into 3d space. By surface reconstruction from Delaunay Triangulation, a 3d military GIS symbol was created. DEM grid is used to control the 3d military symbol model's shape and the 3d military GIS symbol can be limited into the DEM grid and follow the DEM grid's surface.