Re: extracting polygonal subgrid from a larger grid file using gmtselect

You can use grdmask to create a mask grid from the polygon file and than 
apply that mask to the grid with grdmath

> Dear All,
>
> I'm wondering if there is a way to extract a polygonal region of 
> interest from a grid file. I used gmtselect, but it seems like it 
> selects only a rectangular grid based on minmax values of polygon 
> file. Is there a way to extract a polygonal grid file instead? I use 
> gmt 5.1 with the following command.
>
> gmtselect input.xyz -Fpolygon.xy > output.xyz
>
> Thank you very much and look forward to your response.
>
> Cheers
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