[gradsusr] Ploting Cross/X at specific grid box

[Dan Zhang]

Dear all,

I have a global NetCDF file (resolution T31) with constant value of 1 and 1000 
missing values. I would like to plot a cross/X at each grid box, except the 
box with missing value.

Questions: 
Is it possible to do it by a loop of 'draw string x-position y-position X'?     
Since x-position and y-position are related to the latitudes and longitudes 
of  the boxes. But then how to exclude the boxes with missing value?
Or is there another easier way?

Please help me out. Thanks a lot.
sincerely,

Dan


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Dan ZHANG

Max Planck Institute for Meteorology
Meteorological Insititute, University Hamburg
KlimaCampus
Room 407, Grindelberg 5
D-20144, Hamburg
Germany

Tel(office):+49 (0)40 42838 5067
Fax:+49 (0)40 42838 5066

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