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Lakes Processor - Using L1 flags?
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Lakes Processor - Using L1 flags?
1/17/12 5:24 PM
Hello!

I have processed a time series of MERIS FRS scenes for a lake (size app 1.8 x 2.7 km) in Denmark. The processing is based on Radiometry corrected data with the Eutrophic Lake module. Sadly, the results are not as anticipated. After having screened the data using the L2 flags I end up with 43 out of 50 extracted cloud free points being extremely low for all products (a_ys_443, a_pig_443, a_total_443, bb_spm_443). The concentrations for e.g. chl are therefore also very low throughout the season (typically between 1 - 1.5 mg/m3) and absolutely no seasonal trend is detectible. The remaining 7 points are also somewhat dodgy…
My question is:
  1. Are the L1 flags used in the L2 IOP processing to exclude pixels from being processed? I notice that all the pixels are flagged with the L1 Land flag
  2. If yes to 1 is there a way to bypass that?
I am using the newest release of BEAM and all modules are updated.

Best regards,
Lars
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RE: Lakes Processor - Using L1 flags?
1/23/12 11:10 AM as a reply to Lars Boye Hansen.
Hi Lars,

I'm sorry, but our chief developer of the lake processor is currently not available, so I cannot tell why your results look not as expected; however, I will try to answer your questions.
You are referring to the MERIS Case-2 Regional Processor, right? I have just looked into it: only the 'invalid' flag of the L1 data is used to exclude pixels. It is used in a hard-coded way, so there's no way for the user to bypass it.
Please let me know if this helps you or if I should investigate further.
Best regards,
Thomas
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