Re: Questions on NCL ESMF Regridding and Plotting

I think the answer to the 1st questions is that to have
true conservative remapping, the ESMF software requires
the *exact* vertex (corner) locations of each cell.
This is not available on Daymet files. NCL makes a guess
at what the vertex locations might be. Possibly, the
guesses were not exact.

On 1/4/13 1:24 PM, David Brown wrote:
> I can't answer the first question, but as to the second, you should set cnFillMode to "RasterFill" or "CellFill" (read the docs to learn the difference - http://www.ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnFillMode), making sure that cnRasterSmoothingOn is set False (that is the default value).
> -dave
>
>
> On Jan 4, 2013, at 1:11 PM, Ping Yang wrote:
>
>> Dear NCL,
>>
>> I have two issues with the NCL:
>>
>> 1) Regridding with ESMF
>> Has anyone here tested the NCL ESMF regridding function with real data, actually I got problems when I did the regridding using Daymet data, what I did was regridding 1KM to 3MIN and Half degree, and I found bias occurred during the regridding using ESMF conserve method (which is not conserve, the regridded output lost precipitation instead of conserve the value)
>>
>> 2)Plotting using the NCL 6.1.0
>> I got problems when plotting the half degree resolution and the 3MIN resolution for the a same dataset(0.5 D was regridded from the 3MIN) , here I show a figure which can
>> <image.png>
>> <image.png>
>> The first one is 0.5 degree and the following one is 3 MIN, however, I expected to see some bricks(coarser grids) instead of so smoothing contour in the half degree plot. Has anyone else has the same problem, or is there a place to configure the plot setting to remove the smoothing effect?
>>
>> Looking forward to hearing from you.
>>
>> Best Regards,
>>
>> Ping
>> --
>> Ping Yang, Ph.D.
>> CUNY Environmental Crossroads Initiative
>> Marshak Science Building - Suite 925
>> The City College of New York - CUNY
>> 160 Convent Avenue, New York NY 10031
>> Phone: 212-650-5769
>> Fax: 212-650-7064
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>
>
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Received on Fri Jan 4 13:28:45 2013