基于城市框架数据的三维城市DEM生成方法

DEM GENERATION OF 3D CITY BASED ON CITY FRAMEWORK DATA

随着"数字城市"建设的不断深化,城市三维景观建设逐渐成为当前研究的热点,而数字高程模型DEM(Digital Elevation Model)作为三维城市模型的基础地形,是城市三维建设中不可缺少的部分。利用城市框架数据构建DEM的方法可以在符合地表实际起伏的情况下,使地面上模型更加贴合地表,更好地增加三维城市DEM的表现效果。其方法是把散点的高程信息与道路等关键城市框架的平面信息相结合,充分利用现有地形数据,快速生成DEM,具有成本低、速度快、易更新的特点。

As the construction of digital city grows rapidly, 3D landscape building has gradually become hotspot in recent researches. DEM（Digital Elevation Model）, as the fundamental terrain of 3D city model, is essential to 3D city construction. The models on terrain can better fit to the surface with the method of generating DEM based on city framework data. The main procedure is to combine the discrete elevation information with the plane information of key city framework such as roads, which can make the best use of existing terrain data to generate DEM rapidly. This method possesses the characters of low expense, rapidity and easy update.