[ncl-talk] How to change values inside the area of a shapefile?

[Adam Phillips]

Hi Zeinab,
You can use the gc_inout function to develop a mask, and then apply the
mask to your data using a where statement.
http://www.ncl.ucar.edu/Document/Functions/Built-in/gc_inout.shtml
There are a number of examples that use gc_inout, including 3 from the
Shapefiles applications page:
http://www.ncl.ucar.edu/Applications/func_list.shtml#gc_inout
Hope that helps! If not, or if you have any other questions, please reply
to the ncl-talk email list.
Adam



On Wed, Dec 9, 2020 at 11:54 PM Zeinab Salah via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi,
> If I have a shapefile for a region, how can I change the values in a
> netcdf file only inside the boundary of the shapefile, and keep the values
> outside it without change?
>
> I used this way: in the region between lat1 and lat2 and lon1 and lon2
> where the value <=50, replace it with 0, however I missed some values,
> therefore I want to change all values inside the region in the shapefile.
> Could you help me, Please?
>
> Thank you in advance.
>
> Best regards,
>
> Zeinab
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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