A neural network method to correct bidirectional effects in water-leaving radiance

Yongzhen Fan, Wei Li, Kenneth J. Voss, Charles K. Gatebe, Knut Stamnes

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

The standard method to convert the measured water-leaving radiances from the observation direction to the nadir direction developed by Morel and coworkers requires knowledge of the chlorophyll concentration (CHL). Also, the standard method was developed for open ocean water, which makes it unsuitable for turbid coastal waters. We introduce a neural network method to convert the water-leaving radiance (or the corresponding remote sensing reflectance) from the observation direction to the nadir direction. This method does not require any prior knowledge of the water constituents or the inherent optical properties (IOPs). This method is fast, accurate and can be easily adapted to different remote sensing instruments. Validation using NuRADS measurements in different types of water shows that this method is suitable for both open ocean and coastal waters. In open ocean or chlorophyll-dominated waters, our neural network method produces corrections similar to those of the standard method. In turbid coastal waters, especially sediment-dominated waters, a significant improvement was obtained compared to the standard method.

Original languageEnglish
Title of host publicationRadiation Processes in the Atmosphere and Ocean, IRS 2016
Subtitle of host publicationProceedings of the International Radiation Symposium (IRC/IAMAS)
EditorsWerner Schmutz, Roger Davies, Luca Egli
ISBN (Electronic)9780735414785
DOIs
StatePublished - 22 Feb 2017
EventInternational Radiation Symposium 2016: Radiation Processes in the Atmosphere and Ocean, IRS 2016 - Auckland, New Zealand
Duration: 16 Apr 201622 Apr 2016

Publication series

NameAIP Conference Proceedings
Volume1810
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Radiation Symposium 2016: Radiation Processes in the Atmosphere and Ocean, IRS 2016
Country/TerritoryNew Zealand
CityAuckland
Period16/04/1622/04/16

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