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http://dx.doi.org/10.7780/kjrs.2011.27.5.613

Estimation of Chlorophyll-a Concentrations in the Nakdong River Using High-Resolution Satellite Image  

Choe, Eun-Young (Nakdong River Environment Research Center, National Institute of Environmental Research (NIER))
Lee, Jae-Woon (Nakdong River Environment Research Center, National Institute of Environmental Research (NIER))
Lee, Jae-Kwan (Nakdong River Environment Research Center, National Institute of Environmental Research (NIER))
Publication Information
Korean Journal of Remote Sensing / v.27, no.5, 2011 , pp. 613-623 More about this Journal
Abstract
This study assessed the feasibility to apply Two-band and Three-band reflectance models for chlorophyll-a estimation in turbid productive waters whose scale is smaller and narrower than ocean using a high spatial resolution image. Those band ratio models were successfully applied to analyzing chlorophyll-a concentrations of ocean or coastal water using Moderate Imaging Spectroradiometer(MODIS), Sea-viewing Wide Field-fo-view Sensor(SeaWiFS), Medium Resolution Imaging Spectrometer(MERIS), etc. Two-band and Three-band models based on band ratio such as Red and NIR band were generally used for the Chl-a in turbid waters. Two-band modes using Red and NIR bands of RapidEye image showed no significant results with $R^2$ 0.38. To enhance a band ratio between absorption and reflection peak, We used red-edge band(710 nm) of RapidEye image for Twoband and Three-band models. Red-RE Two-band and Red-RE-NIR Three-band reflectance model (with cubic equation) for the RapidEye image provided significance performances with $R^2$ 0.66 and 0.73, respectively. Their performance showed the 'Approximate Prediction' with RPD, 1.39 and 1.29 and RMSE, 24.8, 22.4, respectively. Another three-band model with quadratic equation showed similar performances to Red-RE two-band model. The findings in this study demonstrated that Two-band and Three-band reflectance models using a red-edge band can approximately estimate chlorophyll-a concentrations in a turbid river water using high-resolution satellite image. In the distribution map of estimated Chl-a concentrations, three-band model with cubic equation showed lower values than twoband model. In the further works, quantification and correction of spectral interferences caused by suspended sediments and colored dissolved organic matters will improve the accuracy of chlorophyll-a estimation in turbid waters.
Keywords
Chlorophyll-a; Estimation; Nakdong River; RapidEye;
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Times Cited By KSCI : 2  (Citation Analysis)
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