[ncl-talk] regrid to EASE grid

[Dennis Shea]

[1] The lat/lon file for the S. Hem. 721x721 EASE is on the ftp site:
      EaseLatLon.721x721.S_Hem.nc

      That is the only file I have for the S. Hem.

       See: http://nsidc.org/

       Search: EASE

       for other information.

[2] Attached is a modified script and a S. Hem EASE regridded plot.

[3] The error messages are output from the ESMF software. They are warnings
only.

Good Luck
D

On Tue, Sep 6, 2016 at 7:27 PM, Peter Gibson <peter.gibson at unsw.edu.au>
wrote:

> Hi Dennis,
>
>
> Thanks for providing these files.
>
> Correct me if wrong - but it appears the EASE files provided only cover
> the Northern Hemisphere (min=0.00012   max=90)?
>
>
> And, therefore setting *res at gsnPolar     = "SH" *produces missing values
> in the plots.
>
> During the regridding several warnings also produced: *warning:avg:
> Entire input array contains missing values, can't compute average*
>
>
> If this is the issue, and since I am interested in the SH, is it possible
> to upload EASE grids that include the SH?
>
>
> Thanks,
>
> Peter
> ------------------------------
> *From:* Dennis Shea <shea at ucar.edu>
> *Sent:* Wednesday, September 7, 2016 9:03:50 AM
> *To:* Peter Gibson
> *Cc:* ncl-talk at ucar.edu
> *Subject:* Re: [ncl-talk] regrid to EASE grid
>
> The 'EASE.nc' and 'CCSM4.nc" files are not available. However, the source
> CCSM4 file contained data on a rectilinear grid. We have several EASE grid
> files which contain the latitude and longitudes for several EASE
> configurations. Hence, you want rectilinear to curvilinear regridding.
> Attached is a sample output (png) and the NCL script used. The script is
> similar to ESMF_regrid_9.ncl
>
> I have placed the source ERAI file and several files containing various
> latitude and longitude grid configurations at the following ftp location:
>
> ftp ftp.cgd.ucar.edu
> anonymous
> your_email
> prompt
> cd pub/shea/ESMF_EASE
> ls
> mget *
> quit
>
>    518856   sep  6 16:54 EaseLatLon_100km.nc
>  33224032 sep  6 16:54 EaseLatLon.1441x1441.nc
>    8317800 sep  6 16:54 EaseLatLon.721x721.nc
>
>  43913096 sep 6  16:55 erai_1989-2009.mon.msl_psl.nc
>
> The example uses the EASE (721,721) grid.
>
> You may wish to test the bilinear and conservative methods.
> Generating the weights for the conservative method may take some time.
>
> Good Luck
>
>
>
>
>
> On Mon, Sep 5, 2016 at 9:39 PM, Peter Gibson <peter.gibson at unsw.edu.au>
> wrote:
>
>> Hi all,
>>
>>
>> I am attempting to regrid ERA-Interim to an EASE grid, using for example
>> the script https://www.ncl.ucar.edu/Applications/Scripts/ESMF_regrid_9.
>> ncl
>>
>>
>> The files "EASE.nc" and "CCSM4.nc" are not available on the example data
>> page http://www.ncl.ucar.edu/Applications/Data/
>>
>> can they please be added?
>>
>>
>> Regards,
>> Peter
>>
>>
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>
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