DEM DEVELOPMENT AND PRECISION ANALYSIS FOR ANTARCTIC ICE SHEET USING CRYOSAT-2 ALTIMETRY DATA

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
L. Fei, Xiao Feng, Zhang Shengkai, E. Dongchen, C. Xiao, Hao Weifeng, Yuan Lexian, Zuo Yao-Wen
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引用次数: 10

Abstract

Digital elevation models (DEMs) are of fundamental importance to many geoscientific and environmental studies in Antarctic and due to relatively poor coverage by ground based surveys, the main data source for constructing an Antarctic DEM is satellite altimetry. The newest operating satellite-borne altimeter with ice applications is the ESA satellite CryoSat-2, which was launched in April 2010. CryoSat-2 provides altimetry data up to a latitude of 88°S/N, which is a significant improvement to previous satellite-borne altimeters. Based on two full cycles of CryoSat-2 observations acquired between December 2012 and January 2015, we derived a new DEM for the Antarctic Ice Sheet. The accuracy of generated DEM depends largely on the interpolation method adopted and five widely used interpolation methods were compared using the Cross Validation method. The Kriging method yielded better estimates for the Antarctic Ice Sheet and was adopted when constructing the final DEM. For the CryoSat-2 LRM data we followed an iterative approach to correct for the surface slope, and the slope correction was applied to each data point using the relocation method. Data gap beyond the latitudinal limit of the CryoSat-2 mission (88°S) was filled by contour data from Antarctic Digital Database (ADD). Finally, we present a new Antarctic DEM with a pixel size of 1 km×1 km. The accuracy of the final DEM was assessed by ICESat, IceBridge and GPS data and compared with four widely used Antarctic DEMs namely Bamber 1 km DEM, ICESat DEM, RAMPv2 DEM and JLB97 DEM. The results show that the CryoSat-2 DEM has an uncertainty of 0.73±8.398 m. The vertical accuracy of the DEM is better than 1 m at domes, better than 4 m for the ice shelves, better than 10 m for the interior ice sheet and over 150 m for the rugged mountainous and coastal areas.
基于CRYOSAT-2测高数据的南极冰盖DEM开发与精度分析
数字高程模型(DEM)对南极的许多地球科学和环境研究具有根本重要性,由于地面调查的覆盖率相对较低,构建南极DEM的主要数据源是卫星测高。欧空局的CryoSat-2卫星于2010年4月发射,是最新运行的具有结冰应用的星载高度计。CryoSat-2提供高达88°S/N纬度的测高数据,这是对以前卫星测高仪的重大改进。基于2012年12月至2015年1月期间获得的CryoSat-2观测的两个完整周期,我们得出了南极冰盖的新DEM。生成的DEM的精度在很大程度上取决于所采用的插值方法,并使用交叉验证方法对五种广泛使用的插值方法进行了比较。克里格方法对南极冰盖产生了更好的估计,并在构建最终DEM时被采用。对于CryoSat-2 LRM数据,我们采用迭代方法来校正表面斜率,并使用重新定位方法将斜率校正应用于每个数据点。超过CryoSat-2任务纬度限制(88°S)的数据缺口由南极数字数据库(ADD)的等高线数据填补。最后,我们提出了一个新的南极DEM,像素大小为1 km×1 km。通过ICESat、IceBridge和GPS数据评估了最终DEM的精度,并与四个广泛使用的南极DEM进行了比较,即Bamber 1 km DEM、ICESat DEM、RAMPv2 DEM和JLB97 DEM。结果表明,CryoSat-2 DEM的不确定性为0.73±8.398m。在圆顶处,DEM的垂直精度优于1m,在冰架处优于4m,在内部冰盖处优于10m,在崎岖的山区和沿海地区优于150m。
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
期刊介绍:
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