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。
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