Re: ESMF Regridding

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Thu Feb 21 2013 - 09:22:28 MST

What version of NCL do you have? Are you running the ESMF_regrid_15.ncl script that I sent you ?

I just ran this with V6.1.2 and it works fine. I uncommented "Opt@Debug = True" and here's what the output gives me when it reaches the "conserve" regridding part:

. . .

(0) ESMF_regrid_gen_weights: the following command is about to be executed on the system:
(0) 'ESMF_RegridWeightGen --source SrcSCRIP.nc --destination DstSCRIP.nc --weight Curv_2_1x1_conserve.nc --method conserve --src_regional --dst_regional -i --64bit_offset'
(0) --------------------------------------------------
(0) ESMF_regrid_gen_weights: output from 'ESMF_RegridWeightGen':
(0) Starting weight generation with these inputs:
(1) Source File: SrcSCRIP.nc
(2) Destination File: DstSCRIP.nc
(3) Weight File: Curv_2_1x1_conserve.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: conserve
(11) Pole option: NONE
(12) Ignore unmapped destination points
(13) Output weight file in 64bit offset NetCDF file format
(14)
(15) Completed weight generation successfully.
(16)
(0) --------------------------------------------------
(0) ESMF_regrid_gen_weights: 'ESMF_RegridWeightGen' was successful.
(0) ESMF_regrid_with_weights: regridding using interpolation weights ...
(0) ESMF_regrid_with_weights: Source Grid:
(0) rank: 2
(0) dimensions: 277 349
(0) original source rank: 3
(0) latitude min/max: 0.897945/85.3326
(0) longitude min/max:148.642/357.43
(0) ESMF_regrid_with_weights: Destination Grid:
(0) dimensions: 85 209
(0) latitude min/max: 1/85
(0) longitude min/max:149/357
(0) ESMF_regrid_with_weights: retrieving interpolation weights ...
(0) ESMF_regrid_with_weights: calling sparse_matrix_mult to apply weights...
(0) ESMF_regrid_with_weights: dividing results by frac_b...
(0) (currently for conserve interpolation only)
(0) ESMF_regrid_with_weights: dstData
(0) Dimensions: 402 85 209
(0) minSrcData: 229.758
(0) maxSrcData: 400.008
(0) minDstData: 231.09
(0) maxDstData: 400.008
(0) ESMF_copy_varcoords: detected a rectilinear grid.
(0) If you know your grid is rectilinear, then set
(0) opt@DstGridType = "rectilinear" to
(0) prevent this potentially slow test.

--Mary

On Feb 21, 2013, at 9:01 AM, Travis, Katherine wrote:

> Mary
> Thank you,
> When I run the "conserve" regridding again, I still get this error:
> PET0 ESMCI_Regrid_F.C:119 c_esmc_regrid_create() Invalid argument - Src contains a concave cell
>
> Can you help with this?
> Thanks
> Katie
>
> From: Mary Haley <haley@ucar.edu>
> Date: Thursday, February 21, 2013 10:34 AM
> To: Katherine Travis <ktravis@fas.harvard.edu>
> Cc: ncl-talk USERS <ncl-talk@ucar.edu>
> Subject: Re: ESMF Regridding
>
> Hi Katie,
>
> You have a few issues with the code.
>
> First, there's an error with:
>
> Opt@DstLLCorner = (/round(minlat,0),round(minlat,0)/)
>
> it should be:
>
> Opt@DstLLCorner = (/round(minlat,0),round(minlon,0)/)
>
> The SrcGridCornerLat/DstGridCornerLat options are not being used correctly. You need to provide the corners of *each* lat/lon center point, and not just the corners of your domain. You don't appear to have an n x 4 array on your file that defines lat/lon grid corners, so comment those two lines and let ESMF_regrid try to guess at the corners.
>
> Lastly, for ESMF_regrid to guess at the corners, it seems to prefer the longitudes to go from 0 to 360, so you need to do this:
>
> lon2d = where(lon2d.lt.0,lon2d+360,lon2d)
> datAir@lon2d=lon2d
>
> See attached.
>
> --Mary
>
>
> On Feb 20, 2013, at 8:51 AM, Travis, Katherine wrote:
>
> > Dennis,
> > Thank you.
> > The script is loaded: ESMF_regrid_15.ncl.
> > For some reason air.2m.mon.mean.nc forced me to rename it to send, so it
> > is called test.nc.
> > Thanks
> > Katie
> >
> > On 2/20/13 9:37 AM, "Dennis Shea" <shea@ucar.edu> wrote:
> >
> >> Hello
> >>
> >> offline here .......
> >>
> >> Can you please send your file and script to
> >>
> >> ftp ftp.cgd.ucar.edu
> >> anonymous
> >> <use your email address for the password>
> >> cd incoming
> >> put ...
> >> put ...
> >> quit
> >>
> >> Send email to me (shea@ucar.edu) and/or Mary (haley@ucar.edu)
> >> after you have successfully completed the transfer.
> >>
> >> Note that for security reasons, you cannot list the contents of this
> >> directory, and neither can we. We need to know the *exact* names of the
> >> files in order to retrieve them.
> >>
> >> Thx
> >> D
> >>
> >> On 2/20/13 7:16 AM, Travis, Katherine wrote:
> >>> Dennis,
> >>> Thanks. This variable was short, so I unpacked to float. However
> >>> conserve regridding still crashes on the destination corners of the
> >>> grid.
> >>> You can see below I have the source corners, but not the destination.
> >>> When
> >>> I try to provide corners, the program gives me this:
> >>>
> >>> 20130220 091610.975 ERROR PET0 ESMF_Grid.F90:5238
> >>> ESMF_GridCreateFrmScripDistGrd Wrong argument specified - - Bad corner
> >>> array in SCRIP file
> >>>
> >>> netcdf air.2m.mon.mean {
> >>> dimensions:
> >>> time = UNLIMITED ; // (402 currently)
> >>> y = 277 ;
> >>> x = 349 ;
> >>> nbnds = 2 ;
> >>> variables:
> >>> int Lambert_Conformal ;
> >>> Lambert_Conformal:grid_mapping_name =
> >>> "lambert_conformal_conic" ;
> >>> Lambert_Conformal:standard_parallel = 50., 50. ;
> >>> Lambert_Conformal:longitude_of_central_meridian =
> >>> -107. ;
> >>> Lambert_Conformal:latitude_of_projection_origin = 50. ;
> >>> Lambert_Conformal:false_easting = 5632642.22547 ;
> >>> Lambert_Conformal:false_northing = 4612545.65137 ;
> >>> short air(time, y, x) ;
> >>> air:units = "K" ;
> >>> air:long_name = "Monthly Air Temperature at 2 m" ;
> >>> air:scale_factor = 0.003799786f ;
> >>> air:add_offset = 275.5f ;
> >>> air:unpacked_valid_range = 151.f, 400.f ;
> >>> air:precision = 0.003799786f ;
> >>> air:actual_range = 229.7579f, 310.9593f ;
> >>>
> >>> // global attributes:
> >>> :standardpar1 = 50. ;
> >>> :standardpar2 = 50.000001 ;
> >>> :centerlon = -107. ;
> >>> :centerlat = 50. ;
> >>> :latcorners = 1.000001f, 0.897945f, 46.3544f,
> >>> 46.63433f ;
> >>> :loncorners = -145.5f, -68.32005f, -2.569891f,
> >>> 148.6418f ;
> >>> :stream = "s1" ;
> >>> :title = "Monthly NARR" ;
> >>> :Conventions = "CF-1.0" ;
> >>> :history = "created 2005 by Jeff Whitaker" ;
> >>> :institution = "National Centers for Environmental
> >>> Prediction" ;
> >>> :platform = "Model" ;
> >>> :references =
> >>> "http://wwwt.emc.ncep.noaa.gov/mmb/rreanl/index.html\n",
> >>>
> >>> "http://www.esrl.noaa.gov/psd/data/gridded/data.narr.html" ;
> >>> :NCO = "4.0.0" ;
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> On 2/20/13 12:57 AM, "Dennis Shea" <shea@ucar.edu> wrote:
> >>>
> >>>> Before proceeding, could you please do a
> >>>>
> >>>> %> ncdump -h air.2m.mon.mean.nc | less
> >>>>
> >>>> What numeric type is the variable "air" ?
> >>>>
> >>>> If it is type 'short', then you *must* unpack prior to use.
> >>>> Use 'short2flt' located in 'contributed.ncl'
> >>>> http://www.ncl.ucar.edu/Document/Functions/Contributed/short2flt.shtml
> >>>>
> >>>> datAir = short2flt( sfile->air )
> >>>> printVarSummary(datAir)
> >>>> print("datAir: min="+min(datAir)+" max="+max(datAir))
> >>>>
> >>>> Perhaps you were getting the "large errors" cuz you did not unpack.
> >>>>
> >>>>
> >>>>
> >>>> On 2/19/13 5:20 PM, Travis, Katherine wrote:
> >>>>> Hi,
> >>>>> Could anyone who uses the ESMF_regridding.ncl routine tell me how to
> >>>>> properly set the following options?
> >>>>> I am trying to regrid sparse emissions data on a regional (US) 12km by
> >>>>> 12km curvilinear grid to a 1x1degree grid, and the bilinear and path
> >>>>> methods give me large errors.
> >>>>> I am trying to use the conserve method, but I get the error that my
> >>>>> grid corners are bad. Here is how I am currently trying to set them
> >>>>> up:
> >>>>>
> >>>>> srcFile = "air.2m.mon.mean.nc"
> >>>>> sfile = addfile(srcFile,"r")
> >>>>> datAir = sfile->air
> >>>>> lat = sfile->lat
> >>>>> lon = sfile->lon
> >>>>>
> >>>>> Opt@SrcGridCornerLat = (/min(lat(0,:)),min(lat(:,0)),
> >>>>> max(lat(0,:)),max(lat(:,0))/)
> >>>>> Opt@SrcGridCornerLon = (/min(lon(0,:)),min(lon(:,0)),
> >>>>> max(lon(0,:)),max(lon(:,0))/)
> >>>>> Opt@DstGridCornerLat = (/1,1,11,47/)
> >>>>> Opt@DstGridCornerLon = (/-144,-179,-68, 179/)
> >>>>>
> >>>>> Thank you,
> >>>>> --
> >>>>> Katherine R. Travis
> >>>>> PhD Student
> >>>>> Harvard University
> >>>>> SEAS
> >>>>> ktravis@fas.harvard.edu
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> ncl-talk mailing list
> >>>>> List instructions, subscriber options, unsubscribe:
> >>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
> >>>>>
> >>>
> >
>
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Received on Thu Feb 21 09:23:01 2013

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