Radiative transfer model for quality control of above-water hyperspectral downwelling irradiance measurements

Masoud Moradi; Behnaz Arabi; Annelies Hommersom; Johan van der Molen; Cyrus Samimi

doi:10.1117/12.2684363

17 October 2023 Radiative transfer model for quality control of above-water hyperspectral downwelling irradiance measurements

Masoud Moradi, Behnaz Arabi, Annelies Hommersom, Johan van der Molen, Cyrus Samimi

Author Affiliations +

Proceedings Volume 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023; 127280C (2023) https://doi.org/10.1117/12.2684363
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

Above-water spectral measurements are a critical component of ocean remote sensing and provide essential information for validating and improving remote sensing algorithms for water quality analysis. The downwelling irradiance (Es) is an essential component of above-water spectral measurements and it is particularly important for water constituent concentration, sea surface temperature, and atmospheric correction algorithms. The atmosphere particles scatter and absorb the direct and diffusive components of the downwelling irradiance, creating a complex and distorted spectrum. We analyzed 6 years of the above-water hyperspectral measurements collected every 15 minutes at the Royal Netherlands Institute for Sea Research (NIOZ) Jetty Station (JNS) installed in the Marsdiep tidal inlet of the Dutch Wadden Sea. The minimum level of solar irradiance and spectral shape of Es(λ) were simulated using Radiative Transfer (RT) to identify optimal Es spectra that could be favorable for remote sensing applications. The RT models were adjusted for the study area using in-situ bio-optical measurements. The spectrum of Es(λ) at the 3-optical depths were simulated to identify the minimum level of Es(λ). The red-shifted spectrum of Es(λ), caused by intense atmospheric scattering and the reddish hue of dusk or dawn radiations, was identified by Support Vector Machine applied to the simulated Es(λ) components. The results indicated that the maximum spectral value of Es(λ)_max <= 25 mW m^-2 nm^-1 identifies the minimum level of above-water solar irradiance, and the ratios of Es(480)/Es(680) ≤ 1 mW m^-2 nm^-1 and Es(λ)_max/Es(865) ≤ 1.25 mW m^-2 nm^-1 show the red-shifted spectra.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Masoud Moradi, Behnaz Arabi, Annelies Hommersom, Johan van der Molen, and Cyrus Samimi "Radiative transfer model for quality control of above-water hyperspectral downwelling irradiance measurements", Proc. SPIE 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023, 127280C (17 October 2023); https://doi.org/10.1117/12.2684363

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available