Surface roughness characterizations of sea ice and ice sheets: Case studies with MISR data
Surface roughness characterizations of sea ice and ice sheets: Case studies with MISR data
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DOI：
10.1109/tgrs.2002.801581
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发表时间：
2002-07-01
影响因子：
8.2
通讯作者：
Scambos, TA
中科院分区：
文献类型：
--
作者：
Nolin, AW;Fetterer, FM;Scambos, TA
这项工作是对多角度遥感图像在基于表面粗糙度特性的海冰和冰盖表面测绘和表征方面的潜在用途的研究。我们使用多角度成像光谱辐射计（MISR）的数据来证明冰盖和海冰表面具有特征的角度特征，并且这些角度特征可以与光谱特征在多光谱分类中的使用方式大致相同。本文考察了三个案例研究：阿拉斯加北部海岸波弗特海的海冰，格陵兰冰盖西部边缘的雅各布港冰川，以及南极洲麦克默多站以南包含冰川和蓝冰区域的地区。MISR海冰图像似乎描绘了不同的第一年冰类型，在某种程度上，从第一年冰到多年冰的过渡。MISR图像与国家冰中心的合成孔径雷达（SAR）图像和冰分析图表中明显的海冰类型吻合良好。在Jakobshavn冰川上，机载激光高度计的表面粗糙度数据与misr估算的表面粗糙度数据有很好的相关性。在南极洲，与消融有关的蓝冰区很难与裂缝暴露的裸冰区区分开来，但利用多角度数据很容易检测到。这些不寻常的消融表面是光滑的，不像附近的裂隙冰，有强烈的正向散射。这些案例研究表明，MISR数据可以为冰盖和海冰表面特性的遥感做出创新和重要贡献。
This work is an examination of potential uses of multiangular remote sensing imagery for mapping and characterizing sea ice and ice sheet surfaces based on surface roughness properties. We use data from the Multi-angle Imaging SpectroRadiometer (MISR) to demonstrate that ice sheet and sea ice surfaces have characteristic angular signatures and that these angular signatures may be used in much the same way as spectral signatures are used in multispectral classification. Three case studies are examined: sea ice in the Beaufort Sea off the north coast of Alaska, the Jakobshavn Glacier on the western edge of the Greenland ice sheet, and a region in Antarctica south of McMurdo station containing glaciers and blue-ice areas. The MISR sea ice image appears to delineate different first-year ice types and, to some extent, the transition from first-year to multiyear ice. The MISR image shows good agreement with sea ice types that are evident in concurrent synthetic aperture radar (SAR) imagery and ice analysis charts from the National Ice Center. Over the Jakobshavn Glacier, surface roughness data from airborne laser altimeter transects correlate well with MISR-derived estimates of surface roughness. In Antarctica, ablation-related blue-ice areas, which are difficult to distinguish from bare ice exposed by crevasses, are easily detected using multiangular data. These unusual ablation surfaces are smooth and, unlike nearby crevassed ice, are strongly forward scattering. These case studies demonstrate that MISR data can make an innovative and important contribution to remote sensing of ice sheet and sea ice surface properties.