一种基于数字地球的运动模型与地形匹配方法

Terrain Matching Algorithm Based on Digital Globe

三维模型与地形的匹配问题涉及到模型控制矩阵与模型与地形接触点高程值的计算。其中接触点高程值的计算问题与地形渲染采取的数据组织和绘制算法密切相关,采用规则网格构建地形的数字高程模型,在此基础上提出了弱网格实现数据结构的地形匹配算法。首先为三维模型在三维GIS视景中建立了数学控制匹配模型,然后基于规则网格像素坐标系计算模型与地形接触点的高程值。方法不考虑规则网格的具体绘制实现技术,在采用规则网格的地形下具有较强的适用性。

Terrain matching is an important problem in 3D virtual reality. It contains two side contents, one is getting the control matrix of the 3D model and the other is getting the elevation value of the contact point which is between 3D model and terrain. Obviously there is a close relationship between terrain matching algorithm and terrain rendering frame, because the second problem is based on the on the data structure of terrain rendering algorithm. The terrain rendering frame was implemented by Tile map structure and RSG was used to draw the terrain, finally a new terrain matching algorithm was proposed. The mathematics model of the 3D model in the 3D GIS system was created, then a new terrain matching algorithm was proposed based on the RSGpixels reference frame. This algorithm can generally apply in the RSG＇ terrain as the concrete realization of the RSG＇ data structure is ignored.