二维矢量地图高程提取方法研究

Research on the Method of Extracting the Elevation Information from the Two-dimensional Vector Map

二维矢量地图其图元的属性中并没有明确包括三维信息,而是借助图元(如控制点和等高线)之间的位置关系间接给出,这使得矢量地图中三维信息的获取需要耗费大量的人工,进行相关的三维应用比较困难。文中在分析已有二维矢量地图高程提取方法优缺点基础上,提出搜索半径法、不规则三角网法分别进行二维矢量地图控制点和等高线高程信息的提取。实验证明,该方法弥补了已有高程提取方法的不足,提取率和提取准确率均较高,结合少量的人工交互可以解决二维矢量地图高程信息提取问题。

The three-dimensional information is not included clearly in the attribute of the graphical elements in the two-dimensional vector map,which is usually given indirectly by the aid of the position relation between the graphical elements(eg.control points and contour lines),thus making much manual work to be expended in this course and also making it relatively difficult to use the three-dimensional information.In the paper,based on the analysis of advantages and disadvantages of the method that is extracting the elevation from the two-dimensional vector map available,a new method to extract the elevation information regarding the control points and contour lines from the two-dimensional vector map by using the radius-searching method and the irregular triangulation network method respectively is put forward.The experiment results demonstrate that the method could make up the defects existed in the present elevation extraction method,improve obviously the extraction rate and accuracy,and solve effectively the problem of extracting the elevation information from the two-dimensional vector map under the condition of less manual work.