I am actually using gpt with the newest SeaDAS.
I am Mosaic’ing oisst files (for example one of these…( ftp://eclipse.ncdc.noaa.gov/pub/OI-daily-v2/NetCDF/2016/AVHRR/ ).
When I do it from the command line with gpt.sh the missing values are set to 0., which can actually be a valid value. Using the GUI (SeaDAS) it is handled correctly (missing (or land) = NaN).
Are there any tricks with maybe a conditional expression to achieve the same thing with gpt.sh?