Re: Questions on NCL ESMF Regridding and Plotting

Hi NCL,

Thanks for the answers.

For the question #1, Actually the Daymet files were corrected by a set of
coordinates provided by Dave (which were generated by a Geotrans software
that a full coordinates for my study area).I may try a most recent version
of Daymet joining script(which the coordinates were provided by the Daymet
data group). but I guess there should be no diffference.

Thanks,

Ping

On Fri, Jan 4, 2013 at 3:28 PM, Dennis Shea <shea@ucar.edu> wrote:

> 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<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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-- 
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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Received on Fri Jan 4 14:42:20 2013