Comparison of Machine Learning Algorithms for Retrieval of Water Quality Indicators in Case-II Waters: A Case Study of Hong Kong

doi:10.3390/rs11060617

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Comparison of Machine Learning Algorithms for Retrieval of Water Quality Indicators in Case-II Waters: A Case Study of Hong Kong
	Hafeez, Sidrah ; Wong, Man Sing ; Ho, Hung Chak 7; Nazeer, Majid 1,2; Nichol, Janet 3; Abbas, Sawaid ; Tang, Danling 4; Lee, Kwon Ho 5; Pun, Lilian
刊名	REMOTE SENSING
	2019
卷号	11 期号:6 页码:617
关键词	Chlorophyll-a turbidity suspended solids machine learning Landsat
ISSN号	2072-4292
DOI	10.3390/rs11060617
英文摘要	Anthropogenic activities in coastal regions are endangering marine ecosystems. Coastal waters classified as case-II waters are especially complex due to the presence of different constituents. Recent advances in remote sensing technology have enabled to capture the spatiotemporal variability of the constituents in coastal waters. The present study evaluates the potential of remote sensing using machine learning techniques, for improving water quality estimation over the coastal waters of Hong Kong. Concentrations of suspended solids (SS), chlorophyll-a (Chl-a), and turbidity were estimated with several machine learning techniques including Artificial Neural Network (ANN), Random Forest (RF), Cubist regression (CB), and Support Vector Regression (SVR). Landsat (5,7,8) reflectance data were compared with in situ reflectance data to evaluate the performance of machine learning models. The highest accuracies of the water quality indicators were achieved by ANN for both, in situ reflectance data (89%-Chl-a, 93%-SS, and 82%-turbidity) and satellite data (91%-Chl-a, 92%-SS, and 85%-turbidity. The water quality parameters retrieved by the ANN model was further compared to those retrieved by standard Case-2 Regional/Coast Colour (C2RCC) processing chain model C2RCC-Nets. The root mean square errors (RMSEs) for estimating SS and Chl-a were 3.3 mg/L and 2.7 mu g/L, respectively, using ANN, whereas RMSEs were 12.7 mg/L and 12.9 mu g/L for suspended particulate matter (SPM) and Chl-a concentrations, respectively, when C2RCC was applied on Landsat-8 data. Relative variable importance was also conducted to investigate the consistency between in situ reflectance data and satellite data, and results show that both datasets are similar. The red band (wavelength approximate to 0.665 mu m) and the product of red and green band (wavelength approximate to 0.560 mu m) were influential inputs in both reflectance data sets for estimating SS and turbidity, and the ratio between red and blue band (wavelength approximate to 0.490 mu m) as well as the ratio between infrared (wavelength approximate to 0.865 mu m) and blue band and green band proved to be more useful for the estimation of Chl-a concentration, due to their sensitivity to high turbidity in the coastal waters. The results indicate that the NN based machine learning approaches perform better and, thus, can be used for improved water quality monitoring with satellite data in optically complex coastal waters.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17751]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
作者单位	1.Univ Hong Kong, Dept Urban Planning & Design, Hong Kong, Peoples R China 2.East China Univ Technol, Key Lab Digital Land & Resources, Nanchang 330013, Jiangxi, Peoples R China 3.COMSATS Univ Islamabad, Dept Meteorol, EARL, Islamabad 45550, Pakistan 4.Univ Sussex, Dept Geog, Brighton BN1 9RH, E Sussex, England 5.Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China 6.Gangneung Wonju Natl Univ, Dept Atmospher & Environm Sci, Kangnung 25457, Gangwondo, South Korea 7.Hong Kong Polytech Univ, Dept Land Surveying & Geoinformat, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Hafeez, Sidrah,Wong, Man Sing,Ho, Hung Chak,et al. Comparison of Machine Learning Algorithms for Retrieval of Water Quality Indicators in Case-II Waters: A Case Study of Hong Kong[J]. REMOTE SENSING,2019,11(6):617.
APA	Hafeez, Sidrah.,Wong, Man Sing.,Ho, Hung Chak.,Nazeer, Majid.,Nichol, Janet.,...&Pun, Lilian.(2019).Comparison of Machine Learning Algorithms for Retrieval of Water Quality Indicators in Case-II Waters: A Case Study of Hong Kong.REMOTE SENSING,11(6),617.
MLA	Hafeez, Sidrah,et al."Comparison of Machine Learning Algorithms for Retrieval of Water Quality Indicators in Case-II Waters: A Case Study of Hong Kong".REMOTE SENSING 11.6(2019):617.