[ncl-talk] regrid variable writing netcdf file

[Rick Brownrigg]

Hi,

Without the data, I can't run the script, but on visual inspection, it
*looks* like you have all the right elements in place to write the NetCDF
file. What's not happening for you -- any errors or odd results, or just
plain nothing?

Rick

On Thu, Mar 22, 2018 at 6:58 AM, Anil Kumar - NOAA Affiliate <
anil.kumar at noaa.gov> wrote:

> Hi,
>
> I am trying to write regrid variable (unstructured data to WRF grid),
> code creates var_regrid  successfully at that point. I want to write
> var_regird variable in separate netcdf file with lat & lon dimension in it.
> Can anyone please help me on this. Thanks
>  The var_regrid print summmary
> ********
>
> Variable: var_regrid
>
> Type: double
>
> Total Size: 1301864 bytes
>
>             162733 values
>
> Number of Dimensions: 2
>
> Dimensions and sizes: [353] x [461]
>
> Coordinates:
>
> Number Of Attributes: 10
>
>   missing_value : -99999
>
>   remap : remapped via ESMF_regrid_with_weights: Bilinear
>
>   lon2d : <ARRAY of 162733 elements>
>
>   lat2d : <ARRAY of 162733 elements>
>
>   long_name : maximum water surface elevationabove geoid
>
>   standard_name : maximum_sea_surface_height_above_geoid
>
>   location : node
>
>   mesh : adcirc_mesh
>
>   units : m
>
>   _FillValue : -99999
>
> ********
> here is the code
>
> begin
>
>
>
>
>  src_file = "maxele.63.nc"
>
>  sfile = addfile(src_file,"r")
>
>
> ;printVarSummary(sfile)
>
>  lat1D = sfile->y
>
>  lon1D = sfile->x
>
>  var = sfile->zeta_max
>
>
>  dst_file = "geo_em.d01.nc"
>
>  dfile    = addfile(dst_file,"r")
>
>
>
> ;---Set up regridding options
>
>
>     Opt                = True
>
>
> ;---"bilinear" is the default. "patch" and "conserve" are other options.
>
>     Opt at InterpMethod     = "bilinear"        ;;---Change (maybe)
>
>     Opt at WgtFileName      = "unstruct_to_rect.nc"
>
>
>     Opt at SrcGridLat       = lat1D
>
>     Opt at SrcGridLon       = lon1D
>
>     Opt at SrcRegional      = False            ;;--Change (maybe)
>
>     Opt at SrcInputFileName = src_file          ; optional, but good idea
>
>
>     Opt at SrcMask2D        = where(.not.ismissing(var),1,0) ; Necessary if
> has
>
>                                                           ; missing
> values.
>
>
>     dst_lat              = dfile->XLAT_M(0,:,:)    ; Be sure to use
> appropriate names
>
>     dst_lon              = dfile->XLONG_M(0,:,:)   ; here.
>
>     Opt at DstGridLon       = dst_lon
>
>     Opt at DstGridLat       = dst_lat
>
>     Opt at DstRegional      = True            ;;--Change (maybe)
>
> ;    Opt at DstMask2D = where(.not.ismissing(dst_lat).and.\
>
> ;                          .not.ismissing(dst_lon),1,0) ; Necessary if
> lat/lon
>
>                                                       ; has missing
> values.
>
>                                                       ; has missing
> values.
>
>     Opt at ForceOverwrite   = True
>
>     Opt at Debug            = True
>
>     Opt at PrintTimings     = True
>
>
>     var_regrid = ESMF_regrid(var,Opt)     ; Do the regridding
>
>
>     printVarSummary(var_regrid)
>
>
>
> ; Code for writing netcdf format file with lat and long cordinate
>
>  setfileoption("nc", "Format",  "NetCDF4")
>
>   fon = "ZETA_MAX_D01.nc"
>
>   system("/bin/rm -f " + fon) ; remove if exists
>
>   fnew = addfile(fon, "c")
>
>
>
> ;===================================================================
>
> ; create global attributes of the file (optional)
>
> ;===================================================================
>
>   fAtt               = True            ; assign file attributes
>
>   fAtt at title         = "NCL Simple Approach to netCDF Creation"
>
>   fAtt at source_file   =  "original-file.nc"
>
>   fAtt at Conventions   = "None"
>
>   fAtt at creation_date = systemfunc ("date")
>
>   fileattdef( fnew, fAtt )            ; copy file attributes
>
>
>   filedimdef(fnew,(/"lat","lon"/),(/353,461/),(/False,False/))
>
>   var_names2D = (/ "var_regrid" /)
>
>   varvar_types2D = (/ "float" /)
>
>
>   filevardef( fnew, var_names2D, varvar_types2D, (/  "lat", "lon" /) )
>
>
>
>   var_regrid!0  =  "lat"
>
>   var_regrid!1  =  "lon"
>
>
>   var_regrid&lat = dst_lat
>
>   var_regrid&lon = dst_lon
>
>
>   var_regrid at long_name = "maximum water surface elevationabove geoid"
>       ; assign attributes
>
>   var_regrid at units     = "m"
>
>
>   fnew->ZETA_MAX = var_regrid                ; name on file different
> from name in code
>
>
>
> end
>
>
> --
> Dr. Anil Kumar
> NWS/NCEP/EMC, Office# 2875
> NOAA Center for Weather and Climate Prediction (NCWCP)
> 5830 UNIVERSITY RESEARCH CT
> College Park, MD 20740-3818
> 301-683-0494 <(301)%20683-0494>
> anil.kumar at noaa.gov
>
>
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