POSTER Session 3

RHODAMINE SPECTRAL CHARACTERIZATION FOR COASTAL SURVEILLANCE

Understanding coastal ocean currents helps predict travel times for toxic material spills. The prevalent method for analyzing dispersion processes in coastal areas and rivers involves visible tracer dyes, such as rhodamine. Nevertheless, in situ measurements of rhodamine have spatial limitations, as instruments can solely provide dye concentration data at a single point. To address this challenge, remote sensing and hyperspectral imagery play a vital role in ocean surveillance, as they can cover a larger area of influence and provide more detailed spatial and spectral information for rhodamine characterization. Although prior research has shown the capability to deduce dye concentrations from remotely sensed data, in-depth studies on the influence of water composition and ocean floor in coastal areas need to be conducted. The image background is expected to influence the spectral information received at the sensor, as rhodamine is a semi-transparent dye when diluted in water. Laboratory experiments help to analyze the influence of water composition and background on the spectral signature of rhodamine. We tried concentrations ranging up to 30 mg/L, using both distilled water and seawater, along with dark and light backgrounds. The results indicate that the most significant spectral regions for distinguishing rhodamine concentration are around 400 nm, 550 nm and 600 nm. In addition, the classification algorithms used to determine the concentrations perform best on light backgrounds and distilled water, with an accuracy above 85%. The study will continue with tests on different sea beds in controlled outdoor experiments, where similar results are expected.

*Ámbar Pérez-García, Universidad de Las Palmas de Gran Canaria, Spain, [email protected], https://orcid.org/0000-0002-2943-6348

Alba Martín Lorenzo, Universidad de Las Palmas de Gran Canaria, Spain, [email protected]

José Fco. López Feliciano, Universidad de Las Palmas de Gran Canaria, Spain, [email protected]

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