Ice Sheet Change Detection by Satellite Image Differencing
Ice Sheet Change Detection by Satellite Image Differencing
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DOI：
10.1016/j.rse.2010.01.014
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发表时间：
2010-07
影响因子：
13.5
通讯作者：
R. Bindschadler;T. Scambos;Hyeungu Choi;T. Haran
中科院分区：
文献类型：
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作者：
R. Bindschadler;T. Scambos;Hyeungu Choi;T. Haran
数字卫星图像对的差异突出了地球表面几乎相同的场景的微妙变化。使用相关的数学关系，光测斜，我们研究了这种方法的有效性，局部冰盖表面地形变化的研究，使用数值实验。然后，我们测试这些结果的差异在南极洲西部的几个地区，包括一些变化以前已经确定在高度计配置文件的图像。该技术与具有低噪声、高辐射灵敏度和几乎相同的太阳照射几何形状的配准图像一起工作得很好。云和霜会降低对地表特征的分辨能力。Landsat-7上的ETM+传感器、EO-1上的ALI传感器以及Aqua和Terra卫星平台上的中分辨率成像光谱仪传感器都有可能探测到局部地形变化，如与冰下湖泊充水-排水事件或接地线变化有关的沙丘移动、表面膨胀和收缩特征。MODIS图像的可用性和频率有利于这种传感器的广泛应用，并使用它，我们展示了定性识别的地形变化和定量映射的坡度和海拔变化。
Differencing of digital satellite image pairs highlights subtle changes in near-identical scenes of Earth surfaces. Using the mathematical relationships relevant to photoclinometry, we examine the effectiveness of this method for the study of localized ice sheet surface topography changes using numerical experiments. We then test these results by differencing images of several regions in West Antarctica, including some where changes have previously been identified in altimeter profiles. The technique works well with coregistered images having low noise, high radiometric sensitivity, and near-identical solar illumination geometry. Clouds and frosts detract from resolving surface features. The ETM+sensor on Landsat-7, ALI sensor on EO-1, and MODIS sensor on the Aqua and Terra satellite platforms all have potential for detecting localized topographic changes such as shifting dunes, surface inflation and deflation features associated with sub-glacial lake fill-drain events, or grounding line changes. Availability and frequency of MODIS images favor this sensor for wide application, and using it, we demonstrate both qualitative identification of changes in topography and quantitative mapping of slope and elevation changes.