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

[Will Hobbs]

Hi Mary

You’re absolutely correct; I was reading a slightly different input domain for the variable ‘var’ and the source latitude. All fixed now; sorry to waste your time on such a silly little error.

Will


From: Mary Haley <haley at ucar.edu>
Date: Tuesday, 21 August 2018 at 6:19 AM
To: Will Hobbs <will.hobbs at utas.edu.au>
Cc: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] ESMF_regrid - SrcGridLat/SrcGridLon not recognised

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<mailto: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<http://cmip-pcmdi.llnl.gov/CMIP5/dataLocation> gridspecFile: gridspec_ocean_fx_FGOALS-g2_historical_r0i0p0.nc<http://historical_r0i0p0.nc> areacello: areacello_fx_FGOALS-g2_historical_r0i0p0.nc<http://historical_r0i0p0.nc> volcello: volcello_fx_FGOALS-g2_historical_r0i0p0.nc<http://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<http://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<http://tmp2.nc>

  SrcFileName : tmp1.nc<http://tmp1.nc>



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