POSTER SESSION 4
10:30–12:30, Thursday, September 17
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1271 | POSTER 256
SWAMPY (SHALLOW WATER SEMI-ANALYTICAL MODEL IN PYTHON)
Bathymetric and bottom cover maps in optically shallow waters are critical for coastal management and habitat monitoring, particularly in sensitive ecosystems such as seagrass meadows and coral reefs. However, retrieving this information from ocean colour observations remains challenging. Several approaches have been proposed to estimate bottom properties, including physics-based inversion algorithms combined with optimization techniques that minimize the mismatch between observed and simulated spectra, as well as more recently, data-driven approaches based on machine learning. While physics-based inversion algorithms are not dependent on a specific training dataset and can therefore be applied more robustly to new regions, their application is often constrained by high computational demand, implementation complexity, and sensitivity to initial parameter guesses. SWAMpy is a Python implementation of a semi-analytical inversion model designed to retrieve water column depth, inherent optical properties, and bottom substrate composition from satellite reflectance that was initially made available in the ESA’s SNAP toolbox an output of the Sen2Coral project. The model builds on the foundational radiative transfer formulations for shallow waters proposed by Lee et al. (1998, 1999) and incorporates key elements from SAMBUCA (Brando et al., 2009) and BOMBER (Giardino et al., 2012), including a relaxed-constraints formulation for bottom reflectance. (Petit et al. 2017). Here, we present an updated version of SWAMpy introducing methodological innovations such as strategies to reduce model unknowns, for example, constraining water column properties using nearby deep-water estimates or using a bathymetric map as input, as well as improved initialization schemes to limit convergence to local minima.
Maria Laura Zoffoli, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), [email protected], https://orcid.org/0000-0003-1892-0051
Simon Oiry, Institut des Substances et Organismes de la Mer, ISOMer, Nantes Université, [email protected]
Claudia Giardino, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR-IREA), [email protected]
Federica Braga, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), [email protected]
Giuliana Profeti, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), [email protected]
Vittorio E. Brando, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
