Mapping blue-ice areas in Antarctica using ETM plus and MODIS data
Mapping blue-ice areas in Antarctica using ETM plus and MODIS data
复制标题
使用 ETM 和 MODIS 数据绘制南极洲蓝冰区域图
DOI：
10.3189/2014aog66a069
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发表时间：
2014-01-01
影响因子：
2.9
通讯作者：
Wang, Kun
中科院分区：
文献类型：
--
作者：
Hui, Fengming;Ci, Tianyu;Wang, Kun
利用1999-2003年南极夏季期间获得的15米空间分辨率的Landsat-7 ETM+图像绘制了南极蓝冰区及其地理分布图，覆盖南纬82.5度以北地区，和2003年12月24日南极洲气象卫星观测期间获得的基于MODIS的南极洲镶嵌图数据集的雪颗粒大小图像，网格间距为125米。从南纬82.5度到南极。利用ETM+数据的波段比和反射率阈值算法和MOA数据的雪粒大小阈值算法生成了BLAs图。其基本原理是，蓝冰可以通过光谱差异和雪和冰的不同粒度与雪或岩石分开。我们估计，在数据采集期间，在南极洲的BLA的总面积为234549 km（2），或大陆面积的1.67%。蓝冰广泛分布在大陆上，但通常位于沿海或山区。本研究中提出的BIA数据集是第一张完全来自ETM+和MODIS数据的覆盖整个南极大陆的地图。该数据集可能有利于冰川学、气象学、气候学和古气候学、陨石收集和飞机跑道选址等领域的其他研究。
Blue-ice areas (BI As) and their geographical distribution in Antarctica were mapped using Landsat-7 ETM+ images with 15 m spatial resolution obtained during the 1999-2003 austral summers and covering the area north of 82.5 degrees S, and a snow grain-size image of the MODIS-based Mosaic of Antarctica (MOA) dataset with 125 m grid spacing acquired during the 2003/04 austral summer from 82.5 degrees S to the South Pole. A map of BlAs was created with algorithms of thresholds based on band ratio and reflectance for ETM+ data and thresholds based on snow grain size for the MOA dataset. The underlying principle is that blue ice can be separated from snow or rock by their spectral discrepancies and by different grain sizes of snow and ice. We estimate the total area of BlAs in Antarctica during the data acquisition period is 234 549 km(2), or 1.67% of the area of the continent. Blue ice is scattered widely over the continent but is generally located in coastal or mountainous regions. The BIA dataset presented in this study is the first map covering the entire Antarctic continent sourced solely from ETM+ and MODIS data. This dataset can potentially benefit other studies in glaciology, meteorology, climatology and paleoclimate, meteorite collection and airstrip site selection.