Data Fusion of Remote-sensing and In-lake chlorophyll a Data Using Statistical Downscaling

Citation

Wilkie CJ, Scott EM, Miller C, Tyler AN, Hunter PD & Spyrakos E (2015) Data Fusion of Remote-sensing and In-lake chlorophyll a Data Using Statistical Downscaling. Spatial Statistics conference 2015, Avignon, France, 09.06.2015-12.06.2015. Procedia Environmental Sciences, 26, pp. 123-126. https://doi.org/10.1016/j.proenv.2015.05.014

Abstract
Chlorophyll a is a green pigment, used as an indirect measure of lake water quality. Its strong absorption of blue and red light allows for quantification through satellite images, providing better spatial coverage than traditional in-lake samples. However, grid-cell scale imagery must be calibrated spatially using in-lake point samples, presenting a change-of-support problem. This paper presents a method of statistical downscaling, namely a Bayesian spatially-varying coefficient regression, which assimilates remotely-sensed and in-lake data, resulting in a fully calibrated spatial map of chlorophyll a with associated uncertainty measures. The model is applied to a case study dataset from Lake Balaton, Hungary.

Keywords
statistical downscaling; Bayesian spatially-varying coefficients; chlorophyll a; spatial calibration; MCMC;

Journal
Procedia Environmental Sciences: Volume 26

People

Dr Peter Hunter

SIEC/Forth-ERA Science Director, Scotland's International Environment Centre

Dr Evangelos Spyrakos

Associate Professor, Biological and Environmental Sciences

Professor Andrew Tyler

Scotland Hydro Nation Chair, Biological and Environmental Sciences