Remote sensing of water quality in an Australian tropical freshwater impoundment using matrix inversion and MERIS images

Campbell, Glenn and Phinn, Stuart R. and Dekker, Arnold G. and Brando, Vittorio E. (2011) Remote sensing of water quality in an Australian tropical freshwater impoundment using matrix inversion and MERIS images. Remote Sensing of Environment, 115 (9). pp. 2402-2414. ISSN 0034-4257

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Abstract

The purpose of this study was to investigate how semi-analytical inversion techniques developed for the remote sensing of water quality parameters (chlorophyll a, tripton and coloured dissolved organic matter (CDOM)) in inland waters could be adapted or improved for application to Australian tropical and sub-tropical water bodies. The Matrix Inversion Method (MIM) with a semi analytic model of the anisotropy of the in-water light field was applied to MERIS images of Burdekin Falls Dam, Australia, a tropical freshwater impoundment. Specific attention was required to improve the atmospheric correction of the MERIS data. The performance of the conventional three band exact solution of the MIM was compared to that of over determined solutions that used constant and differential weighting for each sensor band. The results of the application of the MIM algorithm showed that the best weighting scheme had a mean chlorophyll a retrieval difference of 1.0 μgl-1, the three band direct matrix inversion scheme had a mean difference of 4.2 μgl-1 and the constant weight scheme had a mean difference of 5.5 μgl-1. For tripton, the best performed weighting scheme had a mean difference of 1.2 mgl 1, the three band scheme had a mean difference of 3.4 mgl-1 and the constant weight scheme had a mean difference of 1.8 mgl-1. For the CDOM retrieval, the mean difference was found to be 0.12 m-1 for the best performed weighting scheme, 0.25 m-1 for the three band scheme and 0.52 m-1 for the constant weight scheme. It was found that significant improvements in the accuracy and precision of retrieved water quality parameter values can be obtained by using differentially weighted, over-determined systems of equations, rather than exact solutions. These more reliable estimates of water quality parameters will allow water resource managers to improve their monitoring regimes.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version deposited in accordance with the copyright policy of the publisher. http://www.elsevier.com/wps/find/authorsview.authors/copyright
Depositing User: Mr Glenn Campbell
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 01 Jul 2011 10:45
Last Modified: 03 Jul 2013 00:41
Uncontrolled Keywords: inland water; matrix inversion method; atmospheric correction; phytoplankton; tripton; coloured dissolved organic matter
Fields of Research (FOR2008): 09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961103 Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use)
Identification Number or DOI: doi: 10.1016/j.rse.2011.05.003
URI: http://eprints.usq.edu.au/id/eprint/19214

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