[ncl-talk] ESMF_regrid - SrcGridLat/SrcGridLon not recognised

[Mary Haley]

Hi Will,

Were there any other errors with this script?

The reason I ask is that it looks like your source grid is dimensioned 59 x
360 according to your printVarSummary statement, but the SrcGridLat says it
is an array of 54 elements.  I'm assuming that "var" is the variable you
are regridding? If so, then you will need to make sure the lat/lon arrays
are set to the same lat/lon arrays as "var".  In fact, since "var" is a
rectilinear grid and has lat/lon attached as coordinate arrays, you
shouldn't need to set SrcGridLat or SrcGridLon at all.

I've attached a very simple example of regridding data that is on a
rectilinear grid. You'll see that I'm not setting SrcGridLat/Lon at all.
The data is attached too since it's small.

--Mary




On Sun, Aug 19, 2018 at 6:53 PM, Will Hobbs <will.hobbs at utas.edu.au> wrote:

> Hi all
>
>
>
> I am using ESMF_regrid to regrid a number of different ocean models (some
> rectilinear, some not)  onto a common lat/lon grid. To do this I explicitly
> set the SrcGridLat and SrcGridLon attributes, but sometimes I get the
> following error message:
>
>
>
> (0)  get_src_grid_info: SrcGridType and/or SrcGridLat/SrcGridLon were not
> set.
>
> (0)            Cannot determine the source grid type.
>
>
>
> I’ve done a printVarSummary of both the variable to regrid and the ‘Opt’
> (i.e. options variable – see below) and it’s clear that both attributes are
> there on the Opt file, just not being recognised by ESMF_regrid. I can’t
> find any reason why they wouldn’t be.
>
>
>
> Any ideas?
>
>
>
> Will
>
>
>
> Variable: var
>
> Type: float
>
> Total Size: 4893696000 bytes
>
>             1223424000 values
>
> Number of Dimensions: 4
>
> Dimensions and sizes:     [time | 1920] x [lev | 30] x [lat | 59] x [lon
> | 360]
>
> Coordinates:
>
>             time: [674900.5..733269.5]
>
>             lev: [   5..5243.5966796875]
>
>             lat: [-78.5..-20.5]
>
>             lon: [ 0.5..359.5]
>
> Number Of Attributes: 9
>
>   standard_name :    sea_water_salinity
>
>   long_name :   Sea Water Salinity
>
>   units : psu
>
>   cell_methods :     time: mean (interval: 60 seconds)
>
>   cell_measures :    area: areacello volume: volcello
>
>   history :     2011-12-26T07:02:13Z altered by CMOR: replaced missing
> value flag (1e+35) with standard missing value (1e+20).
> 2011-12-26T07:02:15Z altered by CMOR: Converted type from 'd' to 'f'.
> 2011-12-26T07:02:15Z altered by CMOR: Inverted axis: lat.
>
>   missing_value :    1e+20
>
>   _FillValue :  1e+20
>
>   associated_files : baseURL: http://cmip-pcmdi.llnl.gov/
> CMIP5/dataLocation gridspecFile: gridspec_ocean_fx_FGOALS-g2_
> historical_r0i0p0.nc areacello: areacello_fx_FGOALS-g2_
> historical_r0i0p0.nc volcello: volcello_fx_FGOALS-g2_historical_r0i0p0.nc
>
>
>
> Variable: Opt
>
> Type: logical
>
> Total Size: 4 bytes
>
>             1 values
>
> Number of Dimensions: 1
>
> Dimensions and sizes:     [1]
>
> Coordinates:
>
> Number Of Attributes: 18
>
>   WgtFileName : /g/data1/ua8/CMIP5_ocean_processing/masks/FGOALS-g2/
> FGOALS-g2_-80--25_1x1_level0_weights.nc
>
>   SrcGridMask : <ARRAY of 21240 elements>
>
>   RemovePETLog :     True
>
>   RemoveWgtFile :    False
>
>   RemoveDstFile :    True
>
>   RemoveSrcFile :    True
>
>   DstRegional : True
>
>   DstURCorner : ( -25, 359 )
>
>   DstLLCorner : ( -80,  0 )
>
>   DstGridLon :  <ARRAY of 360 elements>
>
>   DstGridLat :  <ARRAY of 56 elements>
>
>   SrcRegional : True
>
>   SrcGridLon :  <ARRAY of 360 elements>
>
>   SrcGridLat :  <ARRAY of 54 elements>
>
>   ForceOverwrite :   True
>
>   InterpMethod :     bilinear
>
>   DstFileName : tmp2.nc
>
>   SrcFileName : tmp1.nc
>
>
>
>
>
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