测绘通报 ›› 2023, Vol. 0 ›› Issue (6): 124-128.doi: 10.13474/j.cnki.11-2246.2023.0179

• 技术交流 • 上一篇    下一篇

多源数据城区精细DEM建模方法

张龙其1,2, 杜帅1, 熊旭平1,2, 张宇晴1   

  1. 1. 长沙理工大学交通运输工程学院测绘工程系, 湖南 长沙 410015;
    2. 长沙理工大学测绘与 遥感应用研究所, 湖南 长沙 410015
  • 收稿日期:2022-10-26 发布日期:2023-07-05
  • 作者简介:张龙其(1977-),男,博士,讲师,从事地理空间信息采集、处理、应用与开发方面的教学与科研。E-mail:zhanglongqi@csust.edu.cn
  • 基金资助:
    公路工程省部共建教育部重点实验室开放基金(KFJ100109);国家自然科学基金面上项目(41671446);湖南省自然资源科研项目(2021-02);长沙理工大学科研助推计划(2019QJCZ007)

Modeling methodology for fine DEM in urban based on multi-source data

ZHANG Longqi1,2, DU Shuai1, XIONG Xuping1,2, ZHANG Yuqing1   

  1. 1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410015, China;
    2. Institute of Mapping and Remote Sensing Application, Changsha University of Technology, Changsha 410015, China
  • Received:2022-10-26 Published:2023-07-05

摘要: 城区因建筑物密集、植被覆盖、交通流量大等,难以构建精度统一的DEM,本文基于大比例尺数字地形图、DOM、无人机摄影测量生成的DEM或基于激光雷达点云生成的DSM等数据,探讨构建精细DEM的方法。该方法首先从大比例尺数字地形图中提取等高线、高程点等用于直接构建DEM;然后提取道路边线、建筑物轮廓线、广场边界、隔离带、陡坎、湖泊边线等二维特征线要素,分别采用不同的方法融合DEM和DSM获得正确的高程信息,并结合实际情况加工处理后生成三维特征线;最后以此为基础应用具有约束的方法构建TIN模型。本文结合现有的数据源特点,分析了不同区域的模型精度。试验结果表明,构建的DEM与地形图吻合度高,可满足城区洪涝分析、精细管理、实景三维建设的需要。

关键词: 精细DEM, 多源数据, 建模方法, 城镇DEM

Abstract: It is still a current technology problem to build a fine DEM in urban using single technology because of dense buildings,vegetation,heavy traffic,etc. This paper discusses a method to build a fine DEM based on large-scale digital topographic map,DOM and DEM generated by UAV photogrammetry or laser radar point cloud data (DSM). Firstly,contour and elevation points are extracted from large-scale digital topographic map,which can be directly used to construct DEM. Then some extraction is separately done to get terrain-related line elements,which are always 2D without elevation information,such as contour of buildings,road sidelines,square boundaries,scarps,lake sidelines and so on. Then some necessary process is done to build 3D-lines after obtaining from the correct elevation of general DEM and DSM. Based on these 3D lines and elevation points,a heterogeneous TIN model is constructed using constrained TIN methodology. Because of data source with different accuracy in different area,the modeling accuracy is also analyzed using theory and practice. Experiments show that the constructed DEM is so high consistency with the topographic map that can better meet the needs of flood analysis,urban fine management,and real three-dimensional construction.

Key words: fine DEM, multi-source data, modeling method, urban DEM

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