虚拟地形环境中道路与地形模型融合算法研究及精度评价

A Fusion Algorithm and Accuracy Estimate between Road and Terrain in Virtual Terrain Environment

以大比例尺地图构建的虚拟地形环境,由于观察视点的接近以及应用中对各种查询和分析的需要,所以要求构建的环境既能准确地表现地形特征又能使地物与地形精确融合,准确地查询出地物的属性,以满足目视及精确定位的要求。然而,实际应用中往往忽视地形与地物的密切关系,从而导致在目视比例尺条件下出现地物飘在空中或钻入地下等失真现象。为此,本文以道路为例提出了道路模型与地形模型的融合算法,同时对融合后道路与地形模型的精度进行了评估,为构建逼真的地理环境提供了基础。也为河流、岛屿、湖泊等地物与地形模型的融合提供参考。

In virtual terrain environment based on large scale map, because of the needs of nearness to view-point and all kinds of requeries and analysis, it is required to represent exactly terrain characters and make accurate fusion between ground features and terrain in order to meet observation and positioning. However the relationship between ground features and terrain is often neglected in actual applications, which leads to an anamorphic phenomenon that ground features are over or under the land surface. So this paper presents the fusion algorithm of road model and terrain model and evaluates the accuracy of fusion result, which provides reference to the fusion of rivers, islands, lakes and terrain.