title: A Multivariate Model for Coastal Water Quality Mapping Using Satellite Remote Sensing Images.
abstract: his study demonstrates the feasibility of coastal water quality mapping using satellite remote sensing images. Water quality sampling campaigns were conducted over a coastal area in northern Taiwan for measurements of three water quality variables including Secchi disk depth, turbidity, and total suspended solids. SPOT satellite images nearly concurrent with the water quality sampling campaigns were also acquired. A spectral reflectance estimation scheme proposed in this study was applied to SPOT multispectral images for estimation of the sea surface reflectance. Two models, univariate and multivariate, for water quality estimation using the sea surface reflectance derived from SPOT images were established. The multivariate model takes into consideration the wavelength-dependent combined effect of individual seawater constituents on the sea surface reflectance and is superior over the univariate model. Finally, quantitative coastal water quality mapping was accomplished by substituting the pixel-specific spectral reflectance into the multivariate water quality estimation model.
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Yuan-Fong
authors.initials: YF
authors.lastname: Su
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Jun-Jih
authors.initials: JJ
authors.lastname: Liou
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Ju-Chen
authors.initials: JC
authors.lastname: Hou
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Wei-Chun
authors.initials: WC
authors.lastname: Hung
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Shu-Mei
authors.initials: SM
authors.lastname: Hsu
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Yi-Ting
authors.initials: YT
authors.lastname: Lien
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.|Hydrotech Research Laboratory, National Taiwan University, Taipei, Taiwan.
authors.forename: Ming-Daw
authors.initials: MD
authors.lastname: Su
authors.affiliation: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan. rslab@ntu.edu.tw.|Hydrotech Research Laboratory, National Taiwan University, Taipei, Taiwan. rslab@ntu.edu.tw.
authors.forename: Ke-Sheng
authors.initials: KS
authors.lastname: Cheng
authors.affiliation: Water Resources Agency, Taipei, Taiwan.
authors.forename: Yeng-Fung
authors.initials: YF
authors.lastname: Wang
keywords: Remote sensing; coastal water quality; environmental monitoring; water quality mapping^