Evaluation of multi and hyperspectral chl-a algorthms in the Río de la Plata turbid waters during a Cyanobacteria bloom

DOGLIOTTI, A. I.; GOSSN, J. I.; GONZÁLEZ, C.; YEMA L.; SÁNCHEZ ML; O'FARRELL INÉS

Simposio; International Geoscience and Remote Sensing Symposium (IGARSS); 2021

The Río de la Plata estuary, located in the eastern coast of South America, has largesocial, ecological and economical importance for Argentina and Uruguay, in whichmargins their capital cities (Buenos Aires and Montevideo) and a number of harbours,resorts and industrial centres are located. Being the estuary the main source of drinkingwater for the millions of inhabitants in the region and a recreational area, the increasingoccurrence of cyanobacteria blooms, consistently composed of Microcystis andDolichospermum complex, is worrying and the need for a monitoring tool like remotesensing is highly desirable. In the present study we evaluated existing multi- and hyperspectralred/NIR chlorophyll-a (chl-a) algorithms using radiometric and bio-optical fieldmeasurements. Empirically derived multi-spectral algorithms showed poor results,while hyper-spectral algorithms showed better and promising results. S3B/OLCI andCHRIS-PROBA chl-a maps were generated using fitted models derived using the existingin situ dataset.