Biases of SRTM in high-mountain areas:: Implications for the monitoring of glacier volume changes
Biases of SRTM in high-mountain areas:: Implications for the monitoring of glacier volume changes
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DOI：
10.1029/2006gl025862
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发表时间：
2006-04-25
影响因子：
5.2
通讯作者：
Rémy, F
中科院分区：
文献类型：
--
作者：
Berthier, E;Arnaud, Y;Rémy, F
航天飞机雷达地形使命任务（SRTM）地形由于其几乎覆盖全球，是一个有前途的数据集，估计山区冰川体积的变化。但是，首先，它的绝对准确性必须在冰川环境中进行彻底的研究。我们使用的地形数据在法国阿尔卑斯山评估SRTM的冰川体积变化的监测的有用性。我们观察到明显的偏见与海拔高度的无冰和冰川覆盖的地区。在高海拔地区，SRTM海拔被低估了10米。这些偏差会对冰川体积变化的任何估计产生重大影响。如果SRTM是两个比较的地形中最新的，则体积损失被高估（反之亦然）。我们无法对这些偏差的起源以及它们是否影响所有高山地区做出明确的结论，但我们的研究结果要求重新考虑以前基于SRTM的冰川损耗估计。
Because of its nearly global coverage, the Shuttle Radar Topographic Mission (SRTM) topography is a promising data set for estimating mountain glacier volume changes. But, first, its absolute accuracy must be thoroughly investigated in a glacial environment. We use topographic data available in the French Alps to assess the usefulness of SRTM for the monitoring of glacier volume variations. We observe clear biases with altitude both on ice-free and glacier-covered areas. At high altitudes, SRTM elevations are underestimated by up to 10 m. These biases can have a significant impact on any estimate of glacier volume changes. If SRTM is the most recent of the two compared topographies, the volume loss is overestimated (and vice versa). We cannot conclude definitively on the origin of these biases and whether they affect all high-mountain areas but our findings invite reconsideration of previous estimates of glacier wastage based on SRTM.