【摘要】 三维地形是自然环境模拟中不可缺少的重要组成部分,具有广泛的应用价值。本文采用DXF格式文件提取CAD图形中等高线元素,通过建立网格索引实现了DTM数据的高效组织和管理,在VS2005开发环境下,提出按网格轮流取点的策略,减少了搜索时间。实验采用重庆某山区的真实等高线数据运用该算法模拟地形。结果表明,此算法保留了等高线所包含的丰富的地形特征,较好地实现了三维真实感地形重建。更多还原

【Abstract】 3D terrain is an indispensably important part of natural environment simulation,and is widely used in many fields.In this paper the contour line element is extracted from CAD graph by adopting the DXF files.The data of DTM are organized and controlled efficiently by constructing the grid index system.And the search course is accelerated by proposing the strategy of extracting points from alternated grids in turn under VS 2005 developing environment.The experiment uses the real contour lines of a mountainous area in Chongqing and this method to simulate the terrain.The result shows that the proposed algorithm preserves the terrain surface features contained in the contour lines,and well implements the terrain reconstruction with 3D realistic sense.更多还原