Remote Sensing of Water Quality Parameters over Lake Balaton by Using Sentinel-3 OLCI

被引:57
作者
Blix, Katalin [1 ]
Palffy, Karoly [2 ]
Toth, Viktor R. [2 ]
Eltoft, Torbjorn [1 ]
机构
[1] UiT Arctic Univ Norway, Dept Phys & Technol, POB 6050 Langnes, NO-9037 Tromso, Norway
[2] Hungarian Acad Sci, Balaton Limnol Inst, Ctr Ecol Res, Klebelsberg K St 3, H-8237 Tihany, Hungary
关键词
shallow lake; Chl-a; CDOM; TSM; Gaussian process regression; automatic model selection algorithm; MERIS; VALIDATION; PHYTOPLANKTON; ALGORITHMS; REGRESSION; RETRIEVAL; DYNAMICS; COLOR;
D O I
10.3390/w10101428
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Ocean and Land Color Instrument (OLCI) onboard Sentinel 3A satellite was launched in February 2016. Level 2 (L2) products have been available for the public since July 2017. OLCI provides the possibility to monitor aquatic environments on 300 m spatial resolution on 9 spectral bands, which allows to retrieve detailed information about the water quality of various type of waters. It has only been a short time since L2 data became accessible, therefore validation of these products from different aquatic environments are required. In this work we study the possibility to use S3 OLCI L2 products to monitor an optically highly complex shallow lake. We test S3 OLCI-derived Chlorophyll-a (Chl-a), Colored Dissolved Organic Matter (CDOM) and Total Suspended Matter (TSM) for complex waters against in situ measurements over Lake Balaton in 2017. In addition, we tested the machine learning Gaussian process regression model, trained locally as a potential candidate to retrieve water quality parameters. We applied the automatic model selection algorithm to select the combination and number of spectral bands for the given water quality parameter to train the Gaussian Process Regression model. Lake Balaton represents different types of aquatic environments (eutrophic, mesotrophic and oligotrophic), hence being able to establish a model to monitor water quality by using S3 OLCI products might allow the generalization of the methodology.
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页数:20
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