[gradsusr] Maskout sea from shapefile

[Rabah Hachelaf]

Hello all,

I am trying to maskout sea area from shapefile, but the command i found
masked out land area

like :

'open gfs.ctl'
'set rgb 99 227 210 145'
'set lat 12 33'
'set lon 34.5 60'
'd tmp2m'
'set shpopts 99'
'draw shp world'
'printim tmp2m.png'


I am wondring if there is a command line to inverse the process and maskout
sea instead of land.

Thank you

Rabah
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