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Previous Next Up Topic Special Topics / Ocean Color Reprocessing / MODIS Aqua Reprocessing 2010.0 (locked) (13120 hits)
- By @bryan Date 2011-06-07 18:54
The Ocean Biology Processing Group is in final preparations for a partial reprocessing of MODIS-Aqua Ocean Color products to correct for temporal drift in the calibration during the latter period of the mission.  We will be replacing ocean color products from MODS-Aqua spanning the period from 1 January 2009 to present. Details of the change are posted here:

http://oceancolor.gsfc.nasa.gov/WIKI/OCReproc20100MA.html

-- bryan
Parent - By ABorg Date 2011-06-09 10:03
Hi Bryan,

Can I ask if this reprocessing will be following by an update to the SeaDAS software?
Or will the changes be released in updated LUTs?

Thanks for any info

Alexa
Parent - By @bryan Date 2011-06-09 14:18
There will be a minor update to distribute new static data files for the temporal RVS adjustment.

-- bryan
Parent - By mshatley Date 2011-07-06 18:16
Hi Bryan,

I hate to ask, but do you have an idea when the updated static data files will be available?

Thanks for any information,
-- Matt
Parent By @bryan Date 2011-07-06 18:51 Edited 2011-07-06 18:57
I will check with the SeaDAS guru, but in the interim I placed the files here:

ftp://samoa.gsfc.nasa.gov/pub/franz/data/

just drop these into the same directories in your $SEADAS/run/data/ path, and be sure to update the Aqua LUT via the SeaDAS update button.

-- bryan
Parent - By @bryan Date 2011-06-23 21:20
The Partial Mission Reprocessing of MODIS Aqua finished on Monday 20 June. All MODIS Aqua data distributed through the OBPG, including the forward stream, now reflect the R2010.0 reprocessing described here:

  http://oceancolor.gsfc.nasa.gov/WIKI/OCReproc20100MA.html

-- bryan
Parent - By kjwh Date 2011-06-30 17:34
Were the level 3 GSM products also reprocessed?  They are not showing up in the MODISA archive.
Thanks,
Kim
Parent By @bryan Date 2011-06-30 18:08
No, but all evaluation products are in the queue to be regenerated.  It should get done within the next few weeks.  Frankly, we get so little feedback on the evaluation products that I never really know if we should bother. I'm glad to hear that you're using them.

-- bryan 
Parent - By @bryan Date 2011-07-18 20:03
Kim,

The GSM products, and all other evaluation products, have been regenerated for 2009 and later.

-- bryan
Parent - By kjwh Date 2011-07-19 14:21
Thanks Bryan!
Have the reprocessing updates been added to SeaDAS yet or is that still in the works?
Parent By @bryan Date 2011-10-25 13:55
Yes.
Parent - By carlos.ordonez Date 2011-07-12 14:16
Hi,

I am a user of some level 3 data products from MODIS Aqua. Every month I do some processing of chlorophyll concentration, chromophoric dissolved organic matter index (CDOM), and SST (11 um). I understand that the 2010.0 reprocessing only affects chlorophyll and CDOM data but not SST.

Today I have downloaded some daily and 3-day composites of chlorophyll and CDOM at 9 km from http://oceancolor.gsfc.nasa.gov/cgi/l3 to repeat my analyses with the new 2010.0 data. I see that the version of the daily composites there is 2010.0, but this is not the case for the 3-day composites.

My question is: Will the 3-day composites be reprocessed too? I would just like to know this to decide whether to wait for that reprocessing or change my scripts.

Thanks,
Carlos
Parent By norman Date 2011-07-12 15:08
Hi Carlos,

The three-day products are only provided to give users a little
better spatial coverage in near real time.  They are not standard
archive products and are therefore not included in our reprocessing
schedule.  If you wish to have reprocessed three-day products,
you must produce them yourself from the daily products.

Regards,
Norman
Parent - By jlandimvargas Date 2011-10-17 17:15
Hi, I am researching the concentration of chlorophyll on the shelf of my country using MODIS images at level 2. However, I have thought that the images at level 3 with 4km of resolution would be better.But for that I need to know how these images are produced: if they have any additional information or images are the same as level 2 but clean and with lower resolution? Could you give me more information about the best thing to do when i want seasonal and mounthly avarages?

thanks,
Juliane
Parent - By @bryan Date 2011-10-17 18:01
Level-3 is a temporal and/or spatial composite of Level-2 products.  If the resolution is sufficient, then yes I would use Level-3 for seasonal or monthly statistics.

-- bryan
Parent - By jlandimvargas Date 2011-10-24 15:40
Are these composites made by a simple mean?
Parent - By @sean Date 2011-10-24 17:50
Yes.
Parent By @bryan Date 2011-10-25 13:54
Yes, but the temporal averaging is weighted by the square-root of the number of observations. For more details, see:

http://oceancolor.gsfc.nasa.gov/cgi/tech_memo.pl?32

but ignore the part about maximum likelihood estimator.

--  bryan

p.s.: this conversation would be more appropriate to the algorithm forum.
Previous Next Up Topic Special Topics / Ocean Color Reprocessing / MODIS Aqua Reprocessing 2010.0 (locked) (13120 hits)



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