[ncl-talk] large ESMF regrid intermediate files

[Mary Haley]

Hi Katelyn,

You are using an older version of NCL (and hence ESMF_RegridWeightGen) that
doesn't allow you to write NetCDF4 files, which is required in your case in
order to handle the large variable size.

If you can upgrade to NCL V6.2.1 or V6.3.0, then the ESMF regridding
package allows you to write NetCDF4 by adding this option:

opt at NetCDFType = "netcdf4"

--Mary



On Wed, Jul 13, 2016 at 3:44 PM, Katelyn Watson <
katelynwatson at u.boisestate.edu> wrote:

> I have a couple of NCL scripts I have been using to regrid data and am
> having trouble with a new dataset, because the intermediate files appear to
> be too big to write.  I was able to subset and run the scripts, but I would
> prefer not to.  I found some mention of this issue back in the ncl-talk
> archives (https://www.ncl.ucar.edu/Support/talk_archives/2014/1840.html)
> and was curious if there were updates since then.
>
> I have tried including the line below, but still got the same error.  I
> would include the script and files, but the files are not particularly
> small.
>
> setfileoption("nc","format","NetCDF4")
>
> Thanks,
> Katelyn
>
> Output and error message:
>  Copyright (C) 1995-2014 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.2.0
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
> (0) ESMF_regrid_gen_weights: number of processors used: 1
> (0) --------------------------------------------------
> (0) ESMF_regrid_gen_weights: the following command is about to be
> executed on the system:
> (0) 'ESMF_RegridWeightGen --source Daymet.SCRIP_grid_description.nc
> --destination WRF.SCRIP_grid_description.nc --weight
> Daymet_to_WRF.bilinear.WgtFile.nc --method bilinear --src_regional
> --dst_regional -i'
> (0) --------------------------------------------------
> (0) ESMF_regrid_gen_weights: output from 'ESMF_RegridWeightGen':
> (0)      Starting weight generation with these inputs:
> (1)        Source File: Daymet.SCRIP_grid_description.nc
> (2)        Destination File: WRF.SCRIP_grid_description.nc
> (3)        Weight File: Daymet_to_WRF.bilinear.WgtFile.nc
> (4)        Source File is in SCRIP format
> (5)        Source Grid is a regional grid
> (6)        Source Grid is a logically rectangular grid
> (7)        Destination File is in SCRIP format
> (8)        Destination Grid is a regional grid
> (9)        Destination Grid is a logically rectangular grid
> (10)        Regrid Method: bilinear
> (11)        Pole option: NONE
> (12)        Ignore unmapped destination points
> (13)
> (14)     NetCDF Error: Daymet_to_WRF.bilinear.WgtFile.nc : NetCDF: One or
> more variable sizes violate format constraints
> (15)      ERROR: Problem on processor            0 . Please see the
> PET*.RegridWeightGen.Log files for a traceback.
> (0) --------------------------------------------------
> (0) ESMF_regrid_gen_weights: 'ESMF_RegridWeightGen' was not successful.
>
> --
> Katelyn Watson
> PhD Candidate - Geosciences
> Boise State University
> katelynwatson at u.boisestate.edu
>
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