一种基于拓扑简化的规则格网DEM选点方法  

A grid DEM selection method based on topological simplification

作　　者：王洪斌[1,2] 赵骏武[2] 赵学胜 WANG Hongbin;ZHAO Junwu;ZHAO Xuesheng(CNNC Beijing Research Institute of Uranium Geology,Beijing 100029,China;College of Geoscience& Surveying Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《中国科技论文》2018年第3期259-264,共6页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20130023110001);国家自然科学基金资助项目(41601433)

摘　　要：针对传统方法由于缺乏统一简化操作、难以建立地形结构特征线层次与地形简化尺度间的对应关系,提出了一种基于拓扑简化的规则格网数字高程模型(digital elevation model,DEM)选点方法,利用拓扑简化对地形结构特征线取主舍次的特性,只在每级地形结构特征线上自适应地选取地形重要点,从地形结构特征线层次变化的角度实现规则格网DEM的高效简化。通过与传统重要点法及三维道格拉斯法进行对比试验和分析,结果表明,基于拓扑简化的规则格网数字高程模型选点方法不仅能保留地形主要的结构特征,而且数值精度优于传统方法。Aiming at the traditional method due to the lack of unified simplified operation,and it is difficult to establish the corresponding relationship between the scales and the hierarchy of terrain skeleton lines,a novel approach of selecting points based on topological simplification is proposed topological simplification is used to extract the characteristics of the main line of the topographic feature line.The terrain significant points in the skeleton lines are adaptively selected on each level of the terrain feature line,and the DEM of the regular grid is efficiently simplified from the perspective of the change of the terrain structure and feature line level.Through the comparative test and analysis using the traditional point method and three-dimensional Douglas method,the results show that this method can not only retain the main terrain structural characteristics,but also the numerical accuracy be better than the traditional method.

关 键 词：规则格网DEM 拓扑简化 自适应选取 地形重要点 地形简化 

分 类 号：P208[天文地球—地图制图学与地理信息工程]