[ncl-talk] ESMF regridding on mutiple time steps

[Dennis Shea]

[1] The function should work across all time steps.
[2] The following might cause an issue:



*Opt at SrcMask2D         = where(.not.ismissing(var),1,0) *
The left-hand-side clearly expect a 2D array, 'var' (tos) is 3D. Try:



*Opt at SrcMask2D         = where(.not.ismissing(var(0,:,:)),1,0)    ; 2D*
Note: if there are no _FillValue then setting this attribute is not
necessary.

========================================================================


A side point: from NCL 6.2.1 onward the following libraries need not be
explicitly loaded by the user.





*load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"load
"$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"load
"$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"*
In fact, for 6.4.0, the following libraries are loaded by default.

*Preloaded NCL scripts*

Several NCL scripts are now preloaded, and you no longer need to explicitly
load them at the top of your own scripts. Here's a full list of the
preloaded scripts:

    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/bootstrap.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/csm/extval.ncl"
    "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

It's okay to still load these scripts even though it's no longer required.


----

Only, the ESMF_regridding.ncl need be loaded.

*load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"*

On Tue, Apr 4, 2017 at 10:47 PM, wangna at mail.iap.ac.cn <
wangna at mail.iap.ac.cn> wrote:

>
> Dear all,
>
> I am trying to use ESMF_regrid to regrid from a curvillinear grid to a
> 1deg grid. When the variable needed to regrid  is 3-D(time,i,j), I got an
> error as follows:
>
> fatal:Eq: Dimension size, for dimension number 0, of
> operands does not match, can't continue
>
> fatal:["Execute.c":8640]:Execute: Error occurred at or
> near line 1108 in file ./ESMF_regridding.ncl
>
> fatal:["Execute.c":8640]:Execute: Error occurred at or
> near line 2978 in file ./ESMF_regridding.ncl
>
> fatal:["Execute.c":8640]:Execute: Error occurred at or
> near line 3089 in file ./ESMF_regridding.ncl
>
> But for the 2-D variale, my script can be run.
>
> Do I need to write a loop to regrid on mutiple time steps? Or are there
> any other ways?
>
> P.S. the ncl version is 6.4.0
>
> Here's my script:
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> *load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"begin;---Data file containing source grid    dir      = "/home/wangn/data/CMIP5/LGM/monthly/tos/"    src_file = "tos_Omon_CNRM-CM5_lgm_r1i1p1_197001-197912.nc"
>       sfile    = addfile(dir + src_file,"r");---Get variable to regrid    varname = "tos"
>                          var     = sfile->tos    src_lat = sfile->lat
>            src_lon = sfile->lon
>  ;---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       = "curv_to_1deg.nc
> <http://curv_to_1deg.nc>"    Opt at SrcGridLat        = src_lat
>      Opt at SrcGridLon        = src_lon    Opt at SrcRegional       = False
>           Opt at SrcInputFileName  = src_file
>      Opt at SrcMask2D         = where(.not.ismissing(var),1,0)
>
>      Opt at DstGridType       = "1deg"
>       Opt at DstLLCorner       = (/-89.75d,   0.00d /)
>       Opt at DstURCorner       = (/ 89.75d, 359.75d /)  *
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> *    Opt at DstRegional       = False
>       Opt at PrintTimings      = True    Opt at Debug             = True    var_regrid = ESMF_regrid(var,Opt)
>        printVarSummary(var_regrid)end*
>
>
>
> Thank you for your attention
>
> Wang Na
>
> ------------------------------
> wangna at mail.iap.ac.cn
>
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