[ncl-talk] horizontal interpolation

[Jon Meyer]

I might add a possible solution that kills two birds with one stone. The
ECMF regridding functions can be used to increase resolution and capture
the coastlines better, while allowing you to specify a mask(landmask) that
the regridding ignores.

Some examples of the ECMF capabilities can be found at
http://ncl.ucar.edu/Applications/ESMF.shtml

Jon

On Tue, Feb 17, 2015 at 10:06 AM, Adam Phillips <asphilli at ucar.edu> wrote:

> Hi Basit,
> I would suggest setting cnFillMode = "RasterFill" to see exactly where
> data is present. The default setting for cnFillMode ("AreaFill") will not
> necessarily show a grid box with data if there is missing data present
> anywhere around the grid box. This is the case here.
>
> If you are set on interpolating, you can try to use the poisson_grid_fill
> function:
> http://www.ncl.ucar.edu/Document/Functions/Built-in/poisson_grid_fill.shtml
>
> Note that this function will fill in _all_ areas with data. It would then
> be up to you to mask the land out after using poisson_grid_fill.
>
> Hope that helps.. If you have any further questions please respond to
> ncl-talk.
> Adam
>
>
> On Mon, Feb 16, 2015 at 3:36 AM, BasitAli Khan <BasitAli.Khan at kaust.edu.sa
> > wrote:
>
>>   Hi there,
>>
>>  I want to plot  SST from ECMWF-Era-Interim 0.75 x 0.75 degree data. The
>> SST field in this dataset is land masked that is all the land points are
>> 'missing values' . However, due to coarse resolution, there are white
>> spaces along the shorelines (please see the attached figure). I want to
>> interpolate  SST up to shorelines so that no white spaces are shown in the
>> plot. I wonder how can i do this.
>> Any help would be greatly appreciated.
>>
>>  Regards,
>>   Basit
>>
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>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Division, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>
> <http://www.cgd.ucar.edu/staff/asphilli>
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