Next Article in Journal
Ground Deformation Detection Using China’s ZY-3 Stereo Imagery in an Opencast Mining Area
Next Article in Special Issue
Reconstruction of River Boundaries at Sub-Pixel Resolution: Estimation and Spatial Allocation of Water Fractions
Previous Article in Journal
A New Recursive Filtering Method of Terrestrial Laser Scanning Data to Preserve Ground Surface Information in Steep-Slope Areas
Previous Article in Special Issue
Spatial Analysis of Linear Structures in the Exploration of Groundwater
Open AccessArticle

Evaluation of Empirical and Machine Learning Algorithms for Estimation of Coastal Water Quality Parameters

Earth & Atmospheric Remote Sensing Lab (EARL), Department of Meteorology, COMSATS Institute of Information Technology, Islamabad 45550, Pakistan
School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
Department of Geography, College of Social Sciences, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2017, 6(11), 360;
Received: 13 October 2017 / Revised: 9 November 2017 / Accepted: 14 November 2017 / Published: 15 November 2017
Coastal waters are one of the most vulnerable resources that require effective monitoring programs. One of the key factors for effective coastal monitoring is the use of remote sensing technologies that significantly capture the spatiotemporal variability of coastal waters. Optical properties of coastal waters are strongly linked to components, such as colored dissolved organic matter (CDOM), chlorophyll-a (Chl-a), and suspended solids (SS) concentrations, which are essential for the survival of a coastal ecosystem and usually independent of each other. Thus, developing effective remote sensing models to estimate these important water components based on optical properties of coastal waters is mandatory for a successful coastal monitoring program. This study attempted to evaluate the performance of empirical predictive models (EPM) and neural networks (NN)-based algorithms to estimate Chl-a and SS concentrations, in the coastal area of Hong Kong. Remotely-sensed data over a 13-year period was used to develop regional and local models to estimate Chl-a and SS over the entire Hong Kong waters and for each water class within the study area, respectively. The accuracy of regional models derived from EPM and NN in estimating Chl-a and SS was 83%, 93%, 78%, and 97%, respectively, whereas the accuracy of local models in estimating Chl-a and SS ranged from 60–94% and 81–94%, respectively. Both the regional and local NN models exhibited a higher performance than those models derived from empirical analysis. Thus, this study suggests using machine learning methods (i.e., NN) for the more accurate and efficient routine monitoring of coastal water quality parameters (i.e., Chl-a and SS concentrations) over the complex coastal area of Hong Kong and other similar coastal environments. View Full-Text
Keywords: coastal waters; water quality modeling; Landsat; HJ-1 A/B CCD coastal waters; water quality modeling; Landsat; HJ-1 A/B CCD
Show Figures

Graphical abstract

MDPI and ACS Style

Nazeer, M.; Bilal, M.; Alsahli, M.M.M.; Shahzad, M.I.; Waqas, A. Evaluation of Empirical and Machine Learning Algorithms for Estimation of Coastal Water Quality Parameters. ISPRS Int. J. Geo-Inf. 2017, 6, 360.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop