Re: Snow depth interpolation

Assuming you have a triplet: lat[*], lon[*], val[*]

[1] I would eliminate all observations east of 87W and south of 45.5N.
     This would definitely prevent any obs from the western shore regions
     of Michigan from affecting the interpolation. I would keep all
     other obs regardless of state.

     ii = ind(lon.lt.-87.0) ; eliminate Michigan obs

     Then use lat(ii), lon(ii), val(ii)

[2] Try http://www.ncl.ucar.edu/Applications/ESMF.shtml
           Example 21

[3] The next release of NCL [ 6.2.0 ] will have high quality
     nearest neighbor interpolation.

     http://www.ncl.ucar.edu/future_release.shtml

Good luck

On 3/4/14, 9:23 PM, Michael Notaro wrote:
> What NCL function is recommended for interpolating
> daily snow depth (cm) observations from weather stations to
> a 0.5 degree x 0.5 degree grid in and around Wisconsin?
>
> Can the function avoid trying to interpolate values from Michigan
> across Lake Michigan into Wisconsin? (is that best regulated by
> limiting the radius of influence?)
>
> Thanks, Michael
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Received on Wed Mar 5 08:37:10 2014