Not sure if there is an "easy way" but you can use
the "gc_inout" function to get the grid points you want.
http://www.ncl.ucar.edu/Applications/shapefiles.shtml#ex4
http://www.ncl.ucar.edu/Applications/shapefiles.shtml#ex5
These uses shapefiles to define the boundary.
You can use your own lat/lon boundaries if you wish.
On 11/3/11 2:02 PM, Lei Meng wrote:
> Hi There,
> I was wondering if there is any easy way to calculate an average of
> precipitation in ERA40 over China. As you know, the boundary of China
> map is irregular. I just don't want include gridcells outside. Any
> suggestions will be appreciated. Thanks,
> Lei Meng
>
>
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Received on Fri Nov 4 07:32:44 2011
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