A new digital elevation model of Antarctica derived from CryoSat-2 altimetry
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry
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DOI：
10.5194/tc-12-1551-2018
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发表时间：
2017-10
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影响因子：
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通讯作者：
T. Slater;A. Shepherd;M. McMillan;A. Muir;Lin Gilbert;A. Hogg;H. Konrad;T. Parrinello
中科院分区：
文献类型：
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作者：
T. Slater;A. Shepherd;M. McMillan;A. Muir;Lin Gilbert;A. Hogg;H. Konrad;T. Parrinello
抽象。本文基于2010年7月至2016年7月期间CryoSat-2卫星雷达高度计记录的2.5×108个观测数据，提出了一个新的南极冰盖和冰架数字高程模型（DEM）。DEM是从时空拟合到1、2和5公里网格单元内累积的高程测量值形成的，并以1公里的模态分辨率发布。总的来说，94%的地面冰盖和98%的浮冰架被观测到，88 ° S以北的其余网格单元使用普通克里金插值。NASA冰桥行动期间获得的DEM和2.3×107机载激光高度计测量值之间的中位数和均方根差分别为-0.30和13.50 m。DEM的不确定性上升，在高坡度的地区，特别是在高程测量获得低分辨率模式，考虑到这一点，我们估计的平均精度为9.5米-一个值是可比的或更好的其他模型来自卫星雷达和激光测高。
Abstract. We present a new digital elevation model (DEM) of the Antarctic ice sheet and ice shelves based on 2.5×108 observations recorded by the CryoSat-2 satellite radar altimeter between July 2010 and July 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2, and 5 km grid cells, and is posted at the modal resolution of 1 km . Altogether, 94 % of the grounded ice sheet and 98 % of the floating ice shelves are observed, and the remaining grid cells north of 88 ∘ S are interpolated using ordinary kriging. The median and root mean square difference between the DEM and 2.3×107 airborne laser altimeter measurements acquired during NASA Operation IceBridge campaigns are − 0.30 and 13.50 m , respectively. The DEM uncertainty rises in regions of high slope, especially where elevation measurements were acquired in low-resolution mode; taking this into account, we estimate the average accuracy to be 9.5 m – a value that is comparable to or better than that of other models derived from satellite radar and laser altimetry.