Snow cover mapping over the Tibetan Plateau with MODIS and ASTER data
Snow cover mapping over the Tibetan Plateau with MODIS and ASTER data
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DOI：
10.1117/12.836457
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Lina Xu;R. Niu;Yan-nan Zhao;Jiong Li;Ting Wu
中科院分区：
文献类型：
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作者：
Lina Xu;R. Niu;Yan-nan Zhao;Jiong Li;Ting Wu
青藏高原被称为地球的第三极，海拔最高，是水文循环和气候变化非常敏感的地区。青藏高原积雪面积估算与制图对区域气候变化和水文循环具有重要意义。利用线性混合方法估计图像像元的积雪覆盖率，其中混合像元的反射率表示为每种纯地覆盖类型的反射率之和，该反射率由其在仪器视场(IFOV)中各自的面积比例加权。提出了一种基于青藏高原中分辨率成像光谱仪(MODIS)数据的线性光谱分解方法，并用先进星载热发射与反射辐射计(ASTER)15m数据进行了验证。并对整个青藏高原积雪变化进行了分析。2004年，从10月到次年2月，积雪面积大幅增加。然而，直到2005年9月，它才拒绝成为一个相对较小的地区。利用SRTM DEM数据分析了积雪分布与地形高度的关系。
The Tibetan Plateau, called "the third pole" of the Earth by its highest altitude, is a very sensitive area for hydrological cycle and climatic change. To estimate and map the snow covered areas of the Tibetan Plateau is very important for the regional climatic change and hydrological cycle. The fractional snow cover of an image pixel is estimated with a linear mixture approach, where the reflectance of a "mixed" pixel is represented as sum of the reflectance of each pure land cover type weighted by their respective area proportion in the Instrument Field of View (IFOV). A method based on linear spectral unmixing using Moderate Resolution Imaging Spectroradiometer (MODIS) data in the Tibetan Plateau was presented and validated by Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 15m data in this study. The change of the snow covers in the whole Tibetan Plateau was also analyzed. In the year of 2004 the area of the snow covers increased much from October to February of the following year. However, then declined to be a relatively small area until September of 2005. SRTM DEM data was applied to identify the relationship between snow distribution and terrain altitude.