problem with labels

[Arpita Mandal]

hi
i have a binary file of precipitation data for whole world. when i plot in
grads for india i give the lat and lon by set lat and set lon.
now over india i want only the land mass not the oceans.
how do i do those
arpita



     WITH WARM REGARDS

     Dr Arpita Mandal
     Post Doctoral Fellow
     Planetary and Geosciences Division
     Physical Research Laboratory
     Navrangpura, Ahmedabad-380009
     Gujarat, India
     Tel No:07926314260
     Mob No:09427321259
     Email:arpita at prl.ernet.in
           arpita_mandal2000 at yahoo.com