Retrieval of total suspended matter concentration from Gaofen-1 Wide Field Imager (WFI) multispectral imagery with the assistance of Terra MODIS in turbid water - case in Deep Bay
Retrieval of total suspended matter concentration from Gaofen-1 Wide Field Imager (WFI) multispectral imagery with the assistance of Terra MODIS in turbid water - case in Deep Bay
复制标题
借助Terra MODIS从高分一号广域成像仪（WFI）多光谱图像反演浑浊水中的总悬浮物浓度——后海湾案例
DOI：
10.1080/01431161.2016.1199084
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发表时间：
2016
影响因子：
3.4
通讯作者：
Zhang Haidong
中科院分区：
文献类型：
--
作者：
Tian Liqiao;Wai Onyx W. H.;Chen Xiaoling;Li Wenbo;Li Jian;Li Wenkai;Zhang Haidong
本文以中国后海湾地区为研究对象，提出了基于高分一号卫星（GF-1）宽视场成像仪（WFI）数据和中分辨率成像光谱仪（MODIS）数据的高空间分辨率总悬浮物浓度（CTSM）反演模型的建立方法。基于2007年1月至2008年11月2个固定站点OBS 3A浊度和温度监测系统的长期校准ctsmm数据，选择33个配对，建立MODIS大气校正遥感反射率（Rrs,645/Rrs,555）指数检索模型。MODIS模型的验证结果表明，该模型与7个地点的tsm测量结果吻合良好，均方根误差（RMSE）为5.06 mg l−1，决定系数r2为0.80。利用MODIS检索到的6个ctsm产品，对GF-1 WFI rayleigh校正反射率（Rrc）进行了不同波段组合(单波段（Rrc,660）、波段减去（Rrc,660 - Rrc,560）、波段比（Rrc,660/Rrc,560）和660 nm波段总悬浮物指数（TSMI660）的同时评价。结果表明，基于rayleigh校正反射率比（Rrc,660/Rrc,560）的指数模型可以达到可接受的精度，RMSE为14.80 mg l−1，r2为0.62。建议的方法将有助于后海湾的动态监测，更重要的是，当无法获得现场测量时，也可以为研究提供另一种方法。
This study proposed a method for developing high spatial resolution Gaofen-1 satellite (GF-1) Wide Field Imager (WFI)-based total suspended matter concentration (CTSM) retrieval model with the assistance of Moderate Resolution Imaging Spectroradiometer (MODIS) data, using the Deep Bay in China as a case. Based on long-term calibratedCTSMmeasurements of optical backscatter (OBS) 3A turbidity and temperature monitoring system of two stationary stations from January 2007 through November 2008, 33 match-ups were selected to build an exponential retrieval model for MODIS atmospherically corrected remote-sensing reflectance (Rrs) ratio (Rrs,645/Rrs,555). Validation of the MODIS model showed well agreement with the sevenin situCTSMmeasurements with a root mean squared error (RMSE) of 5.06 mg l−1and a coefficient of determinationR2of 0.80. Aided with six MODIS retrievedCTSMproducts, different band combinations (single band (Rrc,660), band subtraction (Rrc,660–Rrc,560), band ratio (Rrc,660/Rrc,560), and total suspended matter index at 660 nm band (TSMI660) were evaluated for simultaneous GF-1 WFI Rayleigh-corrected reflectance (Rrc). The results showed that the exponential model based on the Rayleigh-corrected reflectance ratio (Rrc,660/Rrc,560) could achieve acceptable accuracy, with RMSE of 14.80 mg l−1andR2of 0.62. The proposed method would be helpful for dynamic monitoring in the Deep Bay, and more important could also provide an alternative approach for studies whenin situmeasurements are unreachable.