顾及形态特征的突变地形DEM构建方法  

DEM construction method for abrupt terrain considering morphological feature

作　　者：赵元元 王春 赵明伟[2] 徐燕[2] 吴复柱 ZHAO Yuanyuan;WANG Chun;ZHAO Mingwei;XU Yan;WU Fuzhu(School of Earth Science and Engineering,Hebei University of Engineering,Handan Hebei 056038,China;College of Geographic Information and Tourism,Chuzhou University,Chuzhou Anhui 239000,China)

机构地区：[1]河北工程大学地球科学与工程学院,河北邯郸056038 [2]滁州学院地理信息与旅游学院,安徽滁州239000

出　　处：《北京测绘》2022年第10期1338-1344,共7页Beijing Surveying and Mapping

基　　金：安徽高校省级自然科学研究项目(KJ2020A0722);滁州市科技局指导性计划(2021ZD008);安徽高校自然科学研究重大项目(KJ2021ZD0130);河北省自然科学基金(D2021402033)。

摘　　要：当前数字高程模型(DEM)无法有效表达突变地形真实地表形态,严重制约了突变地形DEM在这些区域的应用。本文选取南京市某一区域为研究区,对特征线分别采用建模可用高程点加密法和平行特征线法,在特征线处理参与的情况下,建立分辨率为1 m规则格网DEM进行对比分析,验证不同方法在突变地形处DEM构建效果。实验结果表明,本研究两种思路构建的DEM与传统DEM相比,无论是高程精度还是形态精度都具有明显的优势。在突变地形两侧高程信息突变不明显的情况下,传统构建法和建模可用高程点加密法平均误差相接近,平行特征线法平均误差仅0.42 m;地形复杂的区域,传统构建法和建模可用高程点加密法平均误差均超过1 m,平行特征线法平均误差仅0.94 m,高程精度验证结果理想。研究表明,无论是地形相对简单的区域还是地形复杂的区域,平行特征线法构建突变地形效果更优。The current digital elevation model(DEM)cannot effectively express the real surface morphology of the abrupt terrain,which seriously restricts the application of the abrupt terrain DEM in these regions.In this paper,a region of Nanjing was selected as the study region,and the modeling available elevation point encryption method and the parallel feature line method were used for the feature lines,and a 1m resolution regular grid DEM was established for comparative analysis with the feature line processing to verify the effect of different methods in DEM construction at abrupt terrain.The experimental results showed that the DEM constructed by the two ideas in this study had obvious advantages in both elevation accuracy and morphological accuracy compared with the traditional DEM.The average error of the modeling available elevation points encryption method and the parallel feature line method were similar and the average error of the two methods were lower than the traditional construction method in the case of the catastrophe of elevation information on both sides of the discontinuous terrain,the average error of the parallel feature line method was lowest.In the region with complex terrain,the average error of the traditional construction method and the modeling available elevation point encryption method exceed 0.9 m,while the average error of the parallel feature line method was only 0.78 m.The study showed that whatever it was the region with relatively simple terrain or the region with complex terrain,the parallel feature line method was more effective.

关 键 词：突变地形 地形特征线 高程点加密 平行特征线 数字高程模型分析 

分 类 号：P258[天文地球—测绘科学与技术]