[ncl-talk] NARR regridded plots

[Dennis Shea]

Two issues:

[1] NARR data (nominally) span -180 to 180. The specified rectilinear
destination grid spanned all positive values

    nlat  = 337
    nlon  = 831
    lat   = fspan(1.0, 85.0 ,nlat)
    lon   = fspan( *150.0,358.5* ,nlon)     ; all > 0

;----FIX: adjust the NARR longitudes to be all positive
    lat2d = sfile->lat             ; (:,:)
    lon2d = sfile->lon           ; (:,:)
    lon2d = *where*(lon2d.lt.0, lon2d+360, lon2d)  ; nominally:  0-360

[2] These netCDF NARR data files have 2 different attributes to specify
missing/Fill values

        uwnd:missing_value = -9.96921e+36f ;
        uwnd:_FillValue = 9.96921e+36f ;

;---print missing/fill information
   nmiss = *num*(var.eq.var at missing_value)
   nfill = *num*(*ismissing*(var))
   print("nmiss="+nmiss+"  nfill="+nfill)

;---Fix conflicting missing_value and _FillValue
   var     = *where*(var.eq.var at missing_value, var at _FillValue, var)
   nmiss = *num*(var.eq.var at missing_value)
   nfill     = *num(ismissing*(var))
   print("nmiss="+nmiss+"  nfill="+nfill)
   print("---")

D

On Sat, Sep 29, 2018 at 12:31 AM Samar Minallah <minallah at umich.edu> wrote:

> Hello,
>
> I am battling with NARR regridding and creating comparison plots. I have
> regridded the NARR data using available scripts (have attached my scripts
> to produce weight files and the regridded netcdf+comparison plots).
>
> I am unable to plot the original and regridded variables correctly and
> cannot seem to identify where it is going wrong (I have attached the output
> image).
>
> Can anyone please assist with this issue.
>
> Thank you
> [image: ESMF_wgts_test.png]
>
>
>
> --
> Samar
>
>
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