| 基于改进的交叉极化比率算法的南极冻融探测 |
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| 引用本文： | 王星东,李新武,熊章强,梁雷.基于改进的交叉极化比率算法的南极冻融探测[J].吉林大学学报(地球科学版),2013,43(1):306-311,318. |
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| 作者姓名： | 王星东 李新武 熊章强 梁雷 |
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| 作者单位： | 1.中南大学有色金属成矿预测教育部重点实验室/地球科学与信息物理学院，长沙410083;
2.中国科学院对地观测与数字地球科学中心，北京100094 |
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| 基金项目： | 国家自然科学基金项目(41076129);国家“863”计划项目(2008AA121702) |
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| 摘 要： | 针对交叉极化比率（cross-polarized gradient ratio，XPGR）算法在冰盖冻融探测中存在的问题，提出了不依赖于实地观测数据的、自动阈值分割的、改进的XPGR微波辐射计南极冰盖冻融探测方法，即运用广义高斯模型对XPGR的长时间序列数据做直方图统计，计算出干湿雪划分的最优阈值，从而得到南极冰盖冻融分布图。试验结果表明：改进前后的结果虽然相差不多，但改进后的方法由于不依赖于实地观测数据，不仅提高了冰盖冻融探测的计算效率、实用性和可操作性，而且还在一定程度上提高了冰盖冻融探测的精度。
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| 关 键 词： | 冻融探测 微波辐射计 改进的XPGR 广义高斯模型 遥感 |
| 收稿时间： | 2012-02-23 |
Antarctic Freeze-Thaw Detection Based on Improved Cross-Polarized Gradient Ratio |
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| Wang Xingdong,Li Xinwu,Xiong Zhangqiang,Liang Lei.Antarctic Freeze-Thaw Detection Based on Improved Cross-Polarized Gradient Ratio[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(1):306-311,318. |
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| Authors: | Wang Xingdong Li Xinwu Xiong Zhangqiang Liang Lei |
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| Institution: | 1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education/School of Geosciences and Info Physics,Central South University，Changsha410083，China;
2.Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing100094, China |
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| Abstract: | In view of the problem of XPGR (cross-polarized gradient ratio) algorithm existed in the ice-sheet freeze-thaw detection, we proposed an improved XPGR algorithm used in the Antarctic ice-sheet freeze-thaw detection by microwave radiometer.The algorithm used the generalized Gaussian model to automatically calculate the optimal threshold of the dry and wet snow through histogram statistics for the long time series data of XPGR, which did not depend on the field observations. By comparing and analyzing, we can see that the two results are very similar, but the new algorithm improves the computational efficiency, usability and operability of detecting in the ice-sheet freeze-thaw detection because the algorithm does not rely on field observations. To some extent, the new algorithm can also improve the accuracy of ice-sheet freeze-thaw detection. |
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| Keywords: | freeze-thaw detection microwave radiometer improved cross-polarized gradient ratio generalized Gaussian model remote sensing |
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