基于不同时期DEM的地形变化提取及等高线更新技术研究  

Research on topographic change extraction and contour line updating technology based on DEM in different times

作　　者：魏灵辉 周利利 WEI Linghui;ZHOU Lili(The Third Institute of Surveying and Mapping of Anhui Province,Hefei,Anhui 230601,China;School of Civil Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China)

机构地区：[1]安徽省第三测绘院,安徽合肥230601 [2]安徽建筑大学土木工程学院,安徽合肥230601

出　　处：《测绘标准化》2024年第1期118-123,共6页Standardization of Surveying and Mapping

摘　　要：为有效提升地形要素数据现势性,针对数字线划图(DLG)更新中快速检测地形变化并进行地貌数据更新的需求,本文提出基于不同期数字高程模型(DEM)的地形变化区域提取及等高线更新的技术方法。该方法通过新旧DEM间求差计算分析,选取合适的高程变化和面积变化阈值,结合现势性最优的数字正射影像图(DOM)甄别提取有效的地形变化区域,并结合等高线反演及高程点内插赋值等,实现变化区域内地貌数据更新。该方法已应用在安徽省1∶10000地形要素数据精细化更新试点项目中,实现了数据的高效、准确更新,在地形变化区域发现和等高线更新工程项目中具有较高的参考应用价值。In order to effectively improve the currency of topographic deta,and meet the needs of rapid detection of topographic changes and geomorphological data updating in digital line graph(DLG)updating,this paper proposes a technical method for topographic change extraction and contour updating based on the digital elevation model(DEM)in defferent times.By calculating and analyzing the difference between the old and new DEMs,the method selects appropriate threshold values of elevation change and area change,combines the latest digital orthophoto map(DOM)to identify and extract the effective region of terrain change,and combines contour inversion and elevation interpolation assignment to realize the updating of geomorphic data in the changing region.This technique has been applied in the pilot project of 1∶10000 terrain element data refinement updating in Anhui Province,which realizes the efficient and accurate updating of the data,and has good reference and application value in the terrain change region discovery and contour updating project.

关 键 词：激光雷达 数字高程模型 地形变化 等高线 

分 类 号：P237[天文地球—摄影测量与遥感]