polar map

[Muyin Wang <muyin@xxxxxxxxxxxxx>]

Hi, I try to plot some polar projection figure using
 go polar_land.jnl
But I was told that 
**TMAP ERR: non-existent or not on line
             unf_tlandr.dat
SET DATA/EZ/col=2/form=unform/var="xland,yland"/grid=gtlandr unf_tlandr.dat
Command file, command group, or REPEAT execution aborted

Can someone tell me where the unf_tlandr.dat is?
Thanks a lot!
Muyin