| 基于天绘一号的匹配生长水体提取方法 |
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| 引用本文： | 王浩,黄文骞,孙鹤泉,李加群.基于天绘一号的匹配生长水体提取方法[J].海洋测绘,2020,40(5):35-39. |
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| 作者姓名： | 王浩 黄文骞 孙鹤泉 李加群 |
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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;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： | 以国产天绘一号01星多光谱4波段影像为数据源,针对大范围水体提取难度大的问题,提出基于归一化水体指数(NDWI)和单波段阈值法的匹配生长算法。采用NDWI水体指数法提取完整的海洋水体和内陆部分水体,将内陆部分水体与单波段阈值对应位置完整的水体做匹配,再通过连通区提取、掩膜运算获得完整的水体分割二值图。采用两景遥感影像(大连和芝罘)进行实验,并与经典水体提取算法进行对比分析。实验结果表明:该法总体精度在90%左右,Kappa系数在0.8左右,对经典提取算法有了显著改善。在大范围提取水体信息时效果较好,提取水体的同时能有效减少陆地阴影造成的干扰,在海陆边界处,陆地轮廓清晰,较好的将陆地和海洋分割开来。
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| 关 键 词： | 海洋遥感 多光谱四波段影像 大范围水体提取 归一化水体指数 单波段阈值 匹配生长算法 天绘一号 |
A Matching Growth Water Extraction Method Based on Tianhui-01 Remote Sensing Image |
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| WANG Hao,HUANG Wenqian,SUN Hequan,LI Jiaqun.A Matching Growth Water Extraction Method Based on Tianhui-01 Remote Sensing Image[J].Hydrographic Surveying and Charting,2020,40(5):35-39. |
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| Authors: | WANG Hao HUANG Wenqian SUN Hequan LI Jiaqun |
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| Abstract: | The multi-spectral and panchromatic images of Tianhui-01 are used as data sources.The matching growth algorithm based on normalized water body index (NDWI) and single-band threshold method is used to solve the problem of large area water body extraction difficulty.NDWI water index method is used to extract the complete Marine water body and parts of inland water body.A part of the inland water body(NDWI) is matched with water body in the same position extracted with the single band threshold, then a complete binary water body segmentation map was obtained by connected region extraction and mask operation.The matching growth algorithm is compared with the classical algorithm through two images of Tianhui-1.The experimental results show that the overall accuracy of this method is about 90% and the Kappa coefficient is above 0.8,which significantly improves the classical extraction algorithm. It is better to extract water information in a wide range,which can effectively reduce the interference caused by land shadow.At the boundary of sea and land,the outline of land is clear,which better separates land from the sea. |
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