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The Relationship Between Seawater Clarity and Water-leaving Reflectance Spectra of Seawater in the Pearl River Estuary |
| CHEN Lei1,2, XIE Jian2, PENG Xiao-juan3, LI Zhen2, LOU Quan-sheng2, ZHANG Xiao-hao2, YANG Fan2 |
1. Department of Remote Sensing and GIS Project, Sun Yat-sen University, Guangzhou 510275, China;
2. South China Sea Marine Engineering and Environment Institute, SOA, Guangzhou 510300, China;
3. South China Sea Environment Monitoring Center, SOA, Guangzhou 510300, China |
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Abstract The water-leaving reflectance spectra of seawater were obtained through data collected at the Pearl River Estuary in May, 2009. Their negative natural logarithmic values were also acquired by calculation. The correlation coefficients between secchi depths and water-leaving reflectance spectra of seawater and their negative natural logarithmic values were calculated. The correlation coefficients between secchi depths and negative natural logarithm values of water-leaving reflectance spectra of seawater are about 11% higher than the correlation coefficients between secchi depths and water-leaving reflectance spectra of seawater. According to the analytical result, the water-leaving reflectance spectra of seawater and their negative natural logarithm values whose correlation coefficients are maximum and whose locations are Hyperion satellite center wavelength were selected to formulate linear, polynomial, power and exponential regression equations which were used to fit seawater clarity. It is found that the power regression equation fitted by the negative natural logarithm values of water-leaving reflectance spectra of seawater at 559 nm can receive better results. The fitting degree R2 is 0.922 2 and the average relative error is 18% for the tested samples. The result obtained by the authors can provide support for retrieval of seawater clarity in South China Sea shore by satellite remote sensing.
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| Keywords
Remote sensing
Greening
City
Strategy for development
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Issue Date: 07 September 2011
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2011,
Vol. 23
