基于大比例尺地形图DEM快速建立方法的研究

Study of DEM Quickly-building Based on Large-scale Relief Maps

利用现有大比例尺地形图快速生成DEM,通过对原数据格式的分析,利用程序采用基于高程点和等高线2种方式从dwg文件中批量提取出高程信息,高效、快速地获取大比例尺地形图中高精度的高程数据;使用VC++和ObjectARX编程技术进行DEM建模,在此过程中,通过采取优化数据结构等几种改进措施有效地减小了数据冗余并大大减少了程序运行的CPU时,快速制作出大区域高分辨率DEM。

The paper introduces DEM quickly-building based on large-scale topographic maps. Through analysing the original data format, using the program to extract in batches height information from the dwg file based on the means of height points and contours, high accuracy data from the large-scale maps are extracted with fast speed and high efficiency. Then DEM modelling is carried ont through V^(++) and Object ARX programming technique. During the procedure, through optimizing the data structure and adopting other measures, the data redundancy is effectively reduced, the working time for program operating in CPU is greatly decreased, DEMs with large area and high resolution are made quickly.