利用高分七号激光测高数据评估不同全球DEMs  

Accuracy Assessment of Global DEMs Based on GF-7 Laser Altimetry Data

作　　者：李昕 胡柳茹 乔俊平 蔡扬扬 LI Xin;HU Liuru;QIAO Junping;CAI Yangyang(The First Topographic Surveying Brigade of Ministry of Natural Resources of the People’s Republic of China,Xi’an 710054,China)

机构地区：[1]自然资源部第一地形测量队,陕西西安710054

出　　处：《地理空间信息》2024年第8期93-96,115,共5页Geospatial Information

基　　金：陕西测绘地理信息局课题资助项目(SCK2021-07)。

摘　　要：全球数字高程模型(DEM)作为重要的测绘产品广泛应用于各个领域。随着对地观测技术的发展,我国全球测图如火如荼地开展,针对获取困难的空白地区,需要利用不同全球或近全球尺度的DEM产品进行补充。结合高分七号激光测高数据对不同全球DEMs的适用性进行评估,尤其是基于不同的地表覆盖类型的高程精度评估。主要采用陕西渭南地区的激光测高数据,对SRTM-1 DEM,ASTER GDEM2,AW3D30 DEM和TanDEM-X 90 m DEM进行精度评估。同时,利用全球30 m地表覆盖数据(GlobeLand30)对激光测高点处的地表进行分类,并对不同的全球DEMs进行分地表覆盖类别统计分析。结果显示,AW3D30 DEM的整体高程精度良好,ASTER GDEM的高程精度整体不佳,TDX90 DEM的精度受植被的影响较大。The global digital elevation model(DEM)is widely applied in various fields as an important mapping and survey product.With the development of earth observation technologies,global mapping is in full swing in China.However,gap areas where access is difficult need to be supplemented with different open or near-global coverage DEM datasets.In this work,we used the GF-7 laser altimetry datasets to assess the accuracy of global DEMs,especially based on different land cover.We assessed SRTM-1 DEM,ASTER GDEM2,AW3D30 DEM and TanDEM-X 90m DEM by laser altimetry over the Weinan City of Shannxi Province in China,and classified the land cover of laser altimetry spot by Globe-Land30 dataset.Then,we categorized the different global DEMs for statistical analysis.The results show the accuracy of AW3D30 is high,the accuracy of ASTER GDEM is worse,and the accuracy of TDX90 DEM is affected by vegetation.

关 键 词：高分七号 激光测高 全球DEMs GlobeLand30 精度评估 

分 类 号：P282[天文地球—地图制图学与地理信息工程]