| 基于Pauli分解散射参数特性的潮沟信息提取 |
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| 引用本文： | 朱言江,韩震,和思海.基于Pauli分解散射参数特性的潮沟信息提取[J].海洋科学进展,2020,38(1):113-120. |
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| 作者姓名： | 朱言江 韩震 和思海 |
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| 作者单位： | 上海海洋大学海洋科学学院,上海,201306,上海海洋大学海洋科学学院,上海201306;上海市河口海洋测绘工程技术研究中心,上海201306 |
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| 基金项目： | 国土资源部公益性行业科研专项项目——淤泥质海岸带遥感地质环境监测技术研究 |
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| 摘 要： | 以长江口九段沙为研究对象,利用2015-04-05全极化Radarsat-2影像数据,首先进行了多视处理和精极化Lee滤波;然后通过Pauli极化分解提取出九段沙水体、潮沟、低矮植被和芦苇的奇次散射系数、45°二面角散射系数和二面角散射系数,并且对4种地物类型(潮沟、水体、低矮植被和芦苇)的3种参数的散射强度分别进行了统计分析;最后选择二面角散射系数作为潮沟信息提取的判别标准,采用区域生长法提取了潮沟信息,并利用数学形态学对区域生长法中的断裂潮沟进行了连接和非潮沟信息的消除。研究结果表明,潮沟和水体的奇次散射强度值分别为0.040和0.038,二者的45°二面角散射系数值为0.001和0.002;潮沟的二面角散射强度值为0.007,低矮植被和芦苇的二面角散射强度值分别为0.783和0.104。
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| 关 键 词： | Pauli分解 散射 极化 潮沟 长江口 |
Information Extraction of Tidal Channels Based on the Scattering Parameter of Pauli Decomposition |
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| ZHU Yan-jiang,HAN Zhen,HE Si-hai.Information Extraction of Tidal Channels Based on the Scattering Parameter of Pauli Decomposition[J].Advances in Marine Science,2020,38(1):113-120. |
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| Authors: | ZHU Yan-jiang HAN Zhen HE Si-hai |
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| Affiliation: | (College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Shanghai Engineering Research Center of Estuarine and Oceanographic Mapping,Shanghai 201306,China) |
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| Abstract: | Jiuduansha in the Yangtze River Estuary was chosen as the study area to explore the method of tidal channel extraction from the full polarization Radarsat-2 image. Multi-look processing and refined Lee filter were applied to the image which was acquired on April 5 th, 2015. Then the Pauli polarization decomposition was used to extract the singular scattering coefficient, dihedral scattering coefficient and 45° dihedral scattering coefficient for different types of ground objects, including water bodies, tidal channel, low vegetation and reed. The results showed that the tidal channel and water body had similar singular scattering coefficients(0.040 versus 0.038) and 45° dihedral scattering coefficients(0.001 versus 0.002), whereas the dihedral scattering coefficient of the tidal channel(0.007) showed noticeable distinction with those of low vegetation(0.783) and reed(0.104). The dihedral scattering coefficient was thus selected as the index to detect the tidal channel, and the information of tidal channels in the study area was derived accordingly with the methods of regional growth and mathematical morphology. |
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| Keywords: | Pauli decomposition scattering polarization tidal channel the Yangtze River estuary |
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