| 南海岛礁遥感影像大气校正算法研究 |
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| 引用本文： | 王浩,黄文骞,王健.南海岛礁遥感影像大气校正算法研究[J].海洋测绘,2021(2):44-48. |
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| 作者姓名： | 王浩 黄文骞 王健 |
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| 作者单位： | 海军大连舰艇学院 军事海洋与测绘系,辽宁 大连 116018;32023 部队,辽宁 大连 116023 |
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| 基金项目： | 国家自然科学基金(41871295) |
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| 摘 要： | 针对目前传统大气辐射传输模型使用时难以确定气溶胶光学厚度的问题,提出一种仅依靠影像自身信息的大气校正算法,该算法针对南海水域清澈的特点,将暗像元法和大气辐射传输模型相结合,通过暗像元匹配和迭代运算确定气溶胶。实验结果表明:该算法与Sen2cor算法相比大气校正后的地物剖面光谱曲线基本一致,校正后影像能够反映出水深与蓝绿波段对数比值较好的相关性,具有较好的使用价值。
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| 关 键 词： | 海洋遥感 大气校正 大气传输模型 暗像元法 南海岛礁 |
Research on atmospheric correction algorithm of remote sensing images of islands and reefs in the South China Sea |
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| WANG Hao,HUANG Wenqian,WANG Jian.Research on atmospheric correction algorithm of remote sensing images of islands and reefs in the South China Sea[J].Hydrographic Surveying and Charting,2021(2):44-48. |
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| Authors: | WANG Hao HUANG Wenqian WANG Jian |
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| Institution: | Department of Military Oceanography and Hydrography,Dalian Naval Academy,Dalian 116018 ,China; 32023 Troops,Dalian 116023 ,China |
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| Abstract: | High-resolution multi-spectral images have great application potential in water depth retrieval of islands and reefs.Atmospheric correction is the basis of water depth retrieval.To solve the problem of difficulty in determining the aerosol optical thickness when using traditional atmospheric radiation transmission models,this paper proposes an atmospheric correction algorithm that only relies on the image itself.This algorithm is based on the clear characteristics of the South China Sea.It uses MODIS surface remote sensing reflectance products,combines the dark pixel method and the atmospheric radiation transmission model,and determines the aerosol optical thickness through dark pixel matching and iterative calculations.The experimental results show that the spectral curves of ground object profile after atmospheric correction are basically the same as Sen2cor algorithm,and the corrected image can reflect the better correlation between water depth and logarithmic ratio of blue and green bands,which has better use value. |
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