[gradsusr] plotting sea ice data in GrADS-defining grid

[Kyle Clem]

Hello GrADS users,

I just started my PhD, and would like to begin incorporating sea ice data into my work. I am trying to convert the Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Dataset (as a service description file .srv) to a GrADS data descriptor file for plotting. Unfortunately, I have not been able to accurately specify the grid values, in particular the undefined values (UNDEF), and possibly the XDEF and YDEF range/contour intervals (not sure if these are correct either). If anyone could take a look at the specifications below and tell me if they see an error, I would greatly appreciate it. Or, if I am missing something.

When I display the descriptor file in GrADS, it says "Entire Grid Undefined."

cat > seaice_con_${seas}.des <<EOF
DSET ^seaice_con_${seas}.bin
TITLE ${seas} Sea Ice Con
options sequential
UNDEF -9e33
XDEF 316 LINEAR 0 1.138089297
YDEF 332 LINEAR -90 0.1520239364
ZDEF 1 LEVELS 1000
TDEF 1 LINEAR Dec1980 1yr
VARS 1
ice_con 1 99 ice_con
ENDVARS
EOF​

Thank you very much for your help!
Kyle Clem


----------------------
Kyle Clem, M.Sc.
PhD Student
School of Geography, Environment and Earth Sciences
Victoria University of Wellington
Cotton Building, Room 222
kyle.clem at vuw.ac.nz