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Thanks. Here is a portion of what I get after I use gpt to mosaic files:metadata:Processing_Graph:node_0:parameters:orthorectify = "false" ;                metadata:Processing_Graph:node_0:parameters:combine = "OR" ;     
...

I just look at ncdump of the L2 nc file.
Thanks.
Amita

In the GUI I can see NaN where there is no data (Rhos =0  there show up as NaN) it is the NetCDF file that they stay 0s and no appear as NaN. I tried a number (-9999) instead of NaN but that does not work either!
Thanks much for your help.
Amita

Hello George,  Thank you for the explanation. What I want to do is exclude land and cloud pixels from mosaic/composite and then set rhos to NaN or some missing value number if the value is 0. My par file looks like this:band1=rhos_412band1Expression=if (rhos_412 != 0) then rhos_412 else NaNqual...

Hello,  I am doing mosaic of a few mages and want to set certain value to NaN  I followed this statement in .par file:  band1Expression=if (Kd_490 != 0) then 1.3/Kd_490 else NaN   and have a statement that looks like:   band1Expression=if (rhos_443 != 0) then rhos_...

Hello,     I am trying one flag at a time, in addition to LAND,  to see the impact. I tried qualityExpression=!l2_flags.LAND and  !l2_flags.CLDICE -- but I still see data when clouds are present. Should it be 'or' so that either land or cloudy pixel will be excluded?...

Thank you.
Amita

Thanks Don. But it is not so obvious in other bands -- just 1640 nm! Is that to be expected?
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Thanks.
Amita

Hello, I am processing MODIS L1 to L2 at 1) 1 km and at 2) 250 m. Please see the attached images - in 1 km image I see stripes. In my par file I did not specify any resolution -- considering that 1 km would be default. Can you please help with this? https://oceancolor.gsfc.nasa.gov/forumdata/attach/...

Thanks George.I am interested in just Rhos for all bands. If I did not specify PRODFAIL, according to you message it would it still exclude invalid pixels - correct?In my averaged image Rhos which are not valid show up as '0'. Is there a way to set them as NaN or other undefined value?Thanks...