[gradsusr] Mask out with polygon shape file

[Alejandro Meza Mayorga]

Hello grads users:

I have a netcdf file that contains daily sst 
values, and I need to extract the grid inside an irregular area between 
lat 0-25 N and lon 110 W to the pacific coastline of the american 
continent. I've read in previous posts that it can be done using the maskout function. And the maskout data can be made using the software MeteoInfo (I read it in this thread: http://gradsusr.org/pipermail/gradsusr/2013-April/034603.html).

But I'm having problems making the shape file needed for the maskout. The area that I need is something like the one on the 
attachment (Area.png). 

Any sugestions on how to make it? Can this be done using MeteoInfo?
  

Hope you can help me.


Thanks in advance. 

Alejandro.
 		 	   		  
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