MINUTES OF KICK-OFF MEETING WG IOCCG ON ATMOSPHERIC
CORRECTION OVER OPTICALLY-COMPLEX WATERS
The members of this IOCCG WG gathered on May 14-15, 2014 at the Laboratoire
d’Océanologie et de Géosciences located in Wimereux, France. Five members were present
in Wimereux: Julien Brajard, Cédric Jamet, Palasinamy Shanmugam, Knut Stamnes, Sindy
Sterckx. Thomas Schroeder was on visio-conference for the entire meeting and Xianqiang He
was present on visioconference on the afternoon of May 14. Sean Bailey, Kevin Ruddick and
Menghua Wang were not available.
The kick-off meeting lasted one and half days (the agenda is at the end of the document).
Half of the meeting concerned presentations of each member showing their actitivities on
the atmospheric correction over optically-complex waters but also their participation in this
working-group. The second part of the meeting concerned different topics:
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Refinement of the goal and purpose of the working group
Datasets
How to inter-compare
Which algorithms
No a priori choice of the algorithms. Algorithm developers will be contacted to
participate to the round-robin. The selection will be done depending of the number of
answers. We consider, for the moment, to compare the algorithms of:
Brajard et al. (2012), He et al. (2013), Ruddick et al. (2000), Schroeder et al. (2007),
Shanmugam (2012), Singh and Shanmugam (2014), Stamnes et al. (2003), standard
NASA, Wang and Shi (2007), Wang et al. (2012).
The following algorithm will be considered by contacting their authors:
Chen et al. (2014), Doerrfer et al. (2007), Mao et al. (2013), Moore et al. (1999),
Steinmetz et al. (2010).
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Which sensors
It has been decided to start with the MODIS sensor as it is the only to have the SWIR
bands. But we will consider the MERIS sensor, with a focus on the next generation, the
Ocean and Land Color Imager (OLCI, launch mid-2015).
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Schedule of the WG
Next meeting
Management of the WG
Wednesday, 14, May, 2014:
9:00-9:30: Welcome (C. Jamet)
9:30-9:45: Why a new IOCCG WG? Purpose, goals of the WG and the kick-off meeting
9:45-10:15: Inter-comparison of atmospheric correction in moderate turbid waters for
SeaWiFS and MODIS-AQUA (C. Jamet)
10:15-10:45: Atmospheric correction using NeuroVaria, (J. Brajard)
10:45-11:00: Coffee break
11:00-11:30: Contribution from Stevens Institute of Technology (K. Stamnes)
11:30-12:00: Sunglint and aerosol correction algorithms for ocean colour sensors:
Preliminary results (P. Shanmugam)
12:00-12:30: Contribution from CSIRO (T. Schroeder)
12:30-14:00: Lunch
14:00-14:30: The use of NIR and SWIR wavelengths in the atmospheric and environment
correction (S. Sterckx)
14:30-15:00: Atmospheric correction using the ultraviolet wavelength for highly turbid
waters (X. He)
15:00: 17:00: Discussions
17:00: Adjourn
Role of each participant
Scope of the WG
Previous experience on round-robins
Lessons learnt from IOCCG report #10, CCI OC, …
What type of algorithms?
Which sensors?
Which datasets? In-situ? Simulated? Satellite? Where?
Schedule of the WG? Report in 2 years?
Thursday, 15, May:
9:00-10:30: Discussions
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Simulated datasets: useful? which aerosol models? Which RTE code for
atmosphere and ocean? How to define IOPs (link with IOCCG WG K.
Ruddick). What to simulate: ρTOA? ρrc= ρa+ ρra+ t.ρw? Multi-scattering?
Which definition of Rrs?
How to compare?
o Match-ups?
o Water-type classification
o Transects
o Error propagation
Sensitivities studies: fixed aerosol/bio-optical model
10:30-11:00: Coffee break
11:00-12:30: Discussions
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Sensitivities studies: fixed aerosol/bio-optical model
How to compare?
o Match-ups?
o Water-type classification
o Transects
o Error propagation
o Influence of observation angles
o ????
Adjacency effects
Other suggestions
12:30-14:00: Lunch
14:00-15:30: Discussions
15:30: Adjourn
One day workshop at Ocean Optics (Sunday, 25, October): 6-month
progress
Schedule of the WG? Report in 2 years?
Management of the WG