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摘要

引用本文:

DOI:

10.11834/jrs.20208361

收稿日期:

2018-09-05

修改日期:

2019-04-17

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基于ASTER GDEM V2的南极伯德冰川高程精度研究
陈昊楠1, 黄艳1, 王淑杰2, 舒松2, 余柏蒗1, 吴健平1
1.华东师范大学 地理信息科学教育部重点实验室;2.美国辛辛那提大学
摘要:

ASTER GDEM V2是研究南极冰盖表面的一种重要DEM数据源。由于南极冰雪区反射率高且缺乏地形特征,导致ASTER GDEM V2存在大量的坑、隆起等噪声,难以直接用于南极地形分析。本文以ICESat/GLAS激光点高程数据作为参考,综合GIS空间分析、三维可视化与空间统计等方法,对南极伯德(Byrd)冰川ASTER GDEM V2进行了基于修正等高线法的误差校正,并将其与ICESat-1 DEM的垂直精度进行了对比分析。结果表明:ASTER GDEM V2的RMSE由校正前的26.56 m下降到校正后的18.77 m,远低于ICESat-1 DEM的RMSE(121.24 m);校正后的ASTER GDEM V2高程精度受坡度影响较小,不存在明显的系统误差,而ICESat-1 DEM的高程精度受坡度的影响较大。本研究进一步通过地形剖面分析得到:校正前的ASTER GDEM V2噪声主要分布于高程较低、地形平坦的区域,通过修正等高线的方法可以有效去除这些噪声,去除噪声后的ASTER GDEM V2可作为研究伯德冰川理想的DEM数据源。

Vertical Accuracy Analysis of ASTER GDEM V2 in Byrd Glacier, Antarctica
Abstract:

ASTER GDEM V2 is one of the most widely used DEM sources in Antarctic for Ice Sheet analysis. However, ASTER GDEM V2 cannot be directly used in Antarctic due to its large anomalies in the snow-covered plateaus, where no obvious surface features is available and surface reflectance is relatively high. This paper quantitatively evaluates the accuracy of anomalies-corrected ASTER GDEM V2 and ICESat-1 DEM in Byrd Glacier. The large anomalies in ASTER GDEM V2 are corrected by using a contour correction method, including GIS spatial analysis, 3D visualization, and statistical analysis. The result shows that the RMSE of ASTER GDEM V2 decreases to 18.77 m (-6.79 m) after correcting, lower than the RMSE of ICESat-1 DEM (121.24 m). The accuracy of corrected ASTER GDEM V2 is barely influenced by slope, without obvious systematic errors. While the accuracy of ICESat-1 DEM is more sensitive to slope. Based on topographic profile analysis, we found that the noises on previous non-corrected ASTER GDEM V2 are mainly distributed on these lower elevation areas and flat areas. They were effectively removed by using a contour correction method. This study indicates that the corrected ASTER GDEM V2 is a desired DEM source for analyzing Byrd Glacier, Antarctica.

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