[ncl-talk] interpolation

[Dennis Shea]

Without the printVarSummary() of your 'z' variable, it is hard to tell what
the problem might be:

function dspnt2 (
                x  [*] : numeric,
                y  [*] : numeric,
                z      : numeric,
                xo [*] : numeric,
                yo [*] : numeric
        )

This assumes a cartesian grid. Still: lon[*] and lat[*] are commonly input
to the function as x[*] and y[*]

=====
However, I am not evne going to deall with the 'dspnt2. Please use the ESMF
regridding library.


  http://www.ncl.ucar.edu/Applications/ESMF.shtml

Something like:

    var = f->FOO
    printVarSummary(var)
    printMinMax(var,0)

    interp_method = "bilinear"   ; "neareststod", "patch"
    wgt_file_name = "wgt.ESHAN_"+interp_method+".nc"

  Opt                 = True
  Opt at SrcGridLat      = lat     ; rectilinear lat[*]
  Opt at SrcGridLon      = lon     ;      "      lon[*]

  Opt at DstGridLat      = ulat    ; unstructured latitudes
  Opt at DstGridLon      = ulon    ;      "       longitudes

  Opt at InterpMethod    = interp_method
  Opt at WgtFileName     = wgt_file_name


  var_regrid = ESMF_regrid(var,Opt)     ; Do the regridding

    printVarSummary(var_regrid))
    printMinMax(var_regrid,0)

PLEASE *CAREFULLY* READ the documentation and examples.


On Thu, Jul 19, 2018 at 2:04 AM, Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com
> wrote:

> Hi,
> Is there any interpolation method from rectilinear grid to an
> unstructured grid other than bilinear interpolation in NCL, like kriging,
> nearest point, etc? However I found this link (https://www.ncl.ucar.edu/
> Support/talk_archives/2011/0595.html) which states "There is no kriging
> interpolation function in NCL".
> Beside that could "dspnt2" be used to interpolate from rectilinear grid
> to an unstructured grid? However it seems it couldn't and following error
> is the subject "fatal:dspnt2: the rightmost dimension of z must be the
> same as the dimension of x and y".
>
> I'll be thankful for any help.
>
> Sincerely
> Ehsan
>
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