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http://dx.doi.org/10.15681/KSWE.2014.30.3.329

Estimating Chlorophyll-a Concentration using Spectral Mixture Analysis from RapidEye Imagery in Nak-dong River Basin  

Lee, Hyuk (Water Quality Assessment Research Division, National Institute of Environmental Research)
Nam, Gibeom (Water Quality Assessment Research Division, National Institute of Environmental Research)
Kang, Taegu (Water Quality Assessment Research Division, National Institute of Environmental Research)
Yoon, Seungjoon (Korean Environmental Industry and Technology Institute)
Publication Information
Abstract
This study aims to estimate chlorophyll-a concentration in rivers using multi-spectral RapidEye imagery and Spectral Mixture Analysis (SMA) and assess the applicability of SMA for multi-temporal imagery analysis. Comparison between images (acquired on Oct. and Nov., 2013) predicted and ground reference chlorophyll-a concentration showed significant performance statistically with determination coefficients of 0.49 and 0.51, respectively. Two band (Red-RE) model for the October and November 2013 RapidEye images showed low performance with coefficient of determinations ($R^2$) of 0.26 and 0.16, respectively. Also Three band (Red-RE-NIR) model showed different performance with $R^2$ of 0.016 and 0.304, respectively. SMA derived Chlorophyll-a concentrations showed relatively higher accuracy than band ratio models based values. SMA was the most appropriate method to calculate Chlorophyll-a concentration using images which were acquired on period of low Chlorophyll-a concentrations. The results of SMA for multi-temporal imagery showed low performance because of the spatio-temporal variation of each end members. This approach provides the potential of providing a cost effective method of monitoring river water quality and management using multi-spectral imagery. In addition, the calculated Chlorophyll-a concentrations using multi-spectral RapidEye imagery can be applied to water quality modeling, enhancing the predicting accuracy.
Keywords
Chlorophyll-a concentration; Minimum noise fraction (MNF); Pixel purity index (PPI); RapidEye imagery; Spectral mixture analysis (SMA);
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