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I am very happy to report that Phase 1 of the SeaWiFS reprocessing in
which all twelve years of GAC L1A-L2 data were processed to produce
the expanded suite of ocean color products has been completed in
about 9.5 hours. There were about 4,200 data days processed at a
rate of about 443 days per hour. That's something like 10,600 data
days per day. Not bad for a system that started out with a design
requirement of 10 data days per day. All of the Level-1, Level-2 and
the expanded suite of Level-3 products products are available via the
The reprocessing of all of the 1 kilometer SeaWiFS data has begun
(on-board recorded LAC and HRPT data which have been combined to
produce a merged LAC product called MLAC) and is showing up on the
web browser as it is processed.
I strongly encourage everyone to take a look at the very extensive
documentation that the Ocean Biology Processing Group has put
together as part of this reprocessing. There are a number of
significant changes that have been implemented including algorithm
updates, calibration changes, filenames and file content. In
addition, a comprehensive presentation on the validation of the
documentation can be found at:
Finally, in an effort to make data access and download even more
efficient, we have recently put on line a new data distribution
Unlike the existing FTP data distribution server
(ftp://oceans.gsfc.nasa.gov), which allows access to Level 3 data for
all supported missions and a limited set of Level 1 and Level 2 MODIS
data, this new server allows users HTTP access to EVERY file within
This new HTTP-based server is intended to replace the functionality
of the existing FTP-based server. To aid in that transition, the
website is organized in a manner that generally replicates the FTP
directory tree structure (although some minor differences exist). An
overview of this new system and links to topics such as examples of
how to retrieve data in bulk , a file search utility to allow users
the ability to
locate data without manually traversing the directory tree and a
description of how to search for data non-interactively can be found
Thanks for your patience, support and participation in this process.
Now, on to MODIS!
The Ocean Biology Processing Group
p.s. Since our group currently supports both ocean color and sea
surface temperature and in the near future will be responsible for
the sea surface salinity processing from the upcoming Aquarius
mission, we should probably start thinking about another name for the
group. We are open to suggestions.
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