Retrieval of Case 2 Water Quality Parameters with Machine Learning
This research addresses the problem of accurately retrieving water quality parameters for remote sensing applications in complex Case 2 waters, which is a challenge for environmental monitoring and aquatic science.
This paper explores various machine learning regression methods to retrieve water quality parameters from the Case2eXtreme dataset, focusing on absorbing waters with high concentrations of colored dissolved organic matter. The study compares regularized linear, random forest, Kernel ridge, Gaussian process, and support vector regressors, validating them against an independent simulation dataset and the OLCI Neural Network Swarm (ONSS).
Water quality parameters are derived applying several machine learning regression methods on the Case2eXtreme dataset (C2X). The used data are based on Hydrolight in-water radiative transfer simulations at Sentinel-3 OLCI wavebands, and the application is done exclusively for absorbing waters with high concentrations of coloured dissolved organic matter (CDOM). The regression approaches are: regularized linear, random forest, Kernel ridge, Gaussian process and support vector regressors. The validation is made with and an independent simulation dataset. A comparison with the OLCI Neural Network Swarm (ONSS) is made as well. The best approached is applied to a sample scene and compared with the standard OLCI product delivered by EUMETSAT/ESA