Dear Support,
I am interested in using l2gen on lakes. I'd like a confirmation on the use of the atmospheric pressure. From the source code, I understand that the pressure used is always the sea level pressure (from MERRA files) to which is applied an exponential correction if proc_land=1 (default) and height >0 . So l2gen in default mode applies an atmospheric correction with a corrected pressure (for the lake altitude). Is this correct ?
A secondary question: when processing OLCI, if MERRA files are given in the l2gen parameter file, l2gen will use the MET data of MERRA and not OLCI's MET data, correct?
Thanks a lot for confirming!
Best
F.
l2gen on lakes / pressure
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OB.DAACx - SeanBailey
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Re: l2gen on lakes / pressure
Frederic,
Yes, by default l2gen corrects for atmospheric pressure, even over high altitude lakes (if proc_land is on, which it is by default). And yes, processing for OLCI uses the input MERRA2 ancillary data, not the ancillary included with the OLCI L1B files.
Regards,
Sean
Yes, by default l2gen corrects for atmospheric pressure, even over high altitude lakes (if proc_land is on, which it is by default). And yes, processing for OLCI uses the input MERRA2 ancillary data, not the ancillary included with the OLCI L1B files.
Regards,
Sean