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Oh hang on, I think I'm an idiot and the numbers I was getting in the above were right. :) Mea culpa.The VIIRS/MODIS figures I had pulled for comparison were not what I thought they were. Going back to my code and getting the correct numbers, I get similar corrections of up to a few percent for ...

Hi all,I’m trying to isolate the SeaWiFS trace gas absorption for water vapour as a sanity check on something. The calculation for two-way transmittance is a fairly simple expression in water_vapor.c within l2gen:/* Returns SeaWiFS water-vapor transmittance */float water_vapor (int iband, float uH2O...

Aha! Even better. :) Thanks! I scanned the flags for a tilt but it didn't click that NAVWARN would cover that. Mea culpa, I should read more closely!

Andy

Thanks, Fred! Yes, that's a better solution. I'll do it that way.

Andy

Hi all,I've been running l1bgen to convert SeaWiFS GAC L1a data to L1b (I don't need L2 data, just the L1b, hence l1bgen not l2gen). I'd like to be able to identify scan lines during which the spacecraft is tilting, so I can have a way to mask them out later (in case they give me trouble...

Thanks, both of you. I appreciate the suggestions. In that case I'll give that a shot when SeaDAS 7.5 comes out. For the moment I can just pull the land mask from OCSSW (ocssw/run/data/common/landmask_GMT15ARC.nc) when I read in the L1b and use that directly to categorise pixels; I tested this m...

Thanks Sean, that is good to know! So to use the latest coefficients (until SeaDAS 7.5) my call looks like this:l1bgen ifile=/data15/asayer/aac/seawifs_input/l1a/S1997259070828.L1A_GAC.x.hdf ofile=/data15/asayer/aac/seawifs_input/l1b/S1997259070828.L1B_GAC.x.h5 gain="[1.0014, 0.9925, 0.9820, 0....

Hi all,I have a quick question about command-line usage of l1bgen from SeaDAS 7.4. My goal is to take L1a files and make L1b files using the latest available calibration coefficients, etc. Reading the documentation I was not 100% sure whether I need to specify the calibration files etc or whether ju...

It turns out that replacing -B with -b in install_ocssw.py was sufficient to get it to run and install without any error messages. :)

Thanks; I am not sure if we can update to a newer git here on this OS but can ask the sysadmin. What are the required versions? The page for requirements listed in the install instructions gives an error code: https://seadas.gsfc.nasa.gov/requirements.html