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太湖沿岸水体高分一号影像的邻近效应校正

Correction of the Adjacency Effect for GF-1 Image in Coastal Waters of Taihu Lake

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摘要

对于沿岸水体, 传感器接收到的水体辐射信号受到沿岸陆地高反射率的影响, 图像对比度降低, 邻近效应影响显著。有效剔除大气衰减和邻近效应, 准确获取水体表面反射率, 是水色遥感定量反演的重要前提。基于2016年4月29日太湖沿岸水体的实测光谱数据与同步过境的高分一号宽覆盖相机(GF-1/WFV)影像, 使用6S模型剔除大气衰减的影响, 并使用核函数表达大气点扩展函数, 进行邻近效应校正。实验结果表明, 邻近效应校正后的图像更清晰, 对比度增大, 水体细节信息更丰富。与6S校正结果相比, 3个同步实测样点的邻近效应校正结果的平均相对误差分别降低了10.8%, 5.24%, 10.39%, 邻近效应校正改进了水面遥感反射率的辐射探测精度。

Abstract

For coastal waters, the radiation signal received by a sensor is affected by the high reflectance of the terrestrial land, which can result in a reduced image contrast and significant adjacency effect. Eliminating atmospheric attenuation and the adjacency effect and obtaining accurate water surface reflectance are important prerequisites for quantitative water color remote sensing. Based on the in situ spectral data of the coastal waters of Taihu Lake on April 29, 2016 and a synchronous Gaofen-1 wide field of view (GF-1/WFV) image, the 6S model was used to eliminate atmospheric attenuation, and a nuclear function is used to express the atmospheric point spread function to correct the adjacency effect. The experimental results show that the image after correcting the adjacency effect is clearer with an increased contrast and more abundant information regarding the water body. Compared with the correction results of the 6S model, the average relative errors of the three in situ synchronous samples after correcting the adjacency effect are reduced by 10.8%, 5.24%, and 10.39%, respectively. Correcting the adjacency effect improves the accuracy of radiation detection of the remote sensing reflectance above water surface.

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中图分类号:TP751

DOI:10.3788/lop55.102803

所属栏目:遥感与传感器

基金项目:国家自然科学基金(41471283,41501374)、浙江省自然科学青年基金(LQ16D010001)

收稿日期:2018-04-18

修改稿日期:2018-04-28

网络出版日期:2018-05-09

作者单位    点击查看

程春梅:浙江水利水电学院测绘与市政工程学院, 浙江 杭州 310018
李渊:浙江工商大学旅游与城乡规划学院, 浙江 杭州 310018
韦玉春:南京师范大学虚拟地理环境教育部重点实验室, 江苏 南京 210023
涂乾光:浙江水利水电学院测绘与市政工程学院, 浙江 杭州 310018

联系人作者:李渊(liyuannjnu@163.com); 程春梅(Chengcm@zjweu.edu.cn);

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引用该论文

Cheng Chunmei,Li Yuan,Wei Yuchun,Tu Qianguang. Correction of the Adjacency Effect for GF-1 Image in Coastal Waters of Taihu Lake[J]. Laser & Optoelectronics Progress, 2018, 55(10): 102803

程春梅,李渊,韦玉春,涂乾光. 太湖沿岸水体高分一号影像的邻近效应校正[J]. 激光与光电子学进展, 2018, 55(10): 102803

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