[ncl-talk] GFS_NCL

[Alan Brammer]

How are you converting from K to C ?

Assume we have tmpK  which has all the metadata associated.

tmpC = tmpK - 273.15    ;;  This will not retain any metadata and NCL will
not know how to plot the variable.
printVarSummary(tmpC)   ;; Will be a blank variable with no information.

Two ways to do it.
;1.
tmpC = tmpK - 273.15     ;;; Lost all metadata.
copy_VarCoords(tmpK, tmpC)   ;; Copy over information about the
coordinates.  variable still doesn't' have units, long name etc, but that
probably doesn't matter.

;2.
tmpC = tmpK    ;;; This will copy metadata
tmpC = tmpC - 273.15  ;; Variable already has metadata and it will be
retained.   (Note: long name and units are likely now incorrect)


As always, use printVarSummary() where ever you do pretty much anything as
you learn to understand how NCL handles metadata and what you need to do
about it.


Good luck,

Alan.



On Thu, 16 Jul 2015 at 19:28 Sebastian Otarola-Bustos <
Sebastian.F.Otarola-Bustos.1 at nd.edu> wrote:

> Thank you very much,
>
> The last question for everybody, I attached you two images, the first one
> I'm plotting temperature in kelvin, in the second one I'm plotting
> temperature in Celcius, but as you can see, unlike what happened in the
> first plot here is painting everything in white. And I'm not sure why/or
> what option in temperature contour plot I should change.
>
>
> Thank you a lot,
> All the best,
> Sebastián.
>
> On Thu, Jul 16, 2015 at 5:41 PM, Dennis Shea <shea at ucar.edu> wrote:
>
>> Take a look at the colormaps:
>>
>> http://www.ncl.ucar.edu/Document/Graphics/color_table_gallery.shtml
>>
>> Choose a blue-red color map
>>
>>   wks = ...
>>   gsn_define_colormap(wks,".....")
>>
>>
>> https://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_define_colormap.shtml
>>
>> ===
>> or
>>
>> res at cnFillPalette        = "...."
>>
>> http://www.ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnFillPalette
>>
>>
>>
>> On Thu, Jul 16, 2015 at 4:21 PM, Sebastian Otarola-Bustos <
>> Sebastian.F.Otarola-Bustos.1 at nd.edu> wrote:
>>
>>> I Finally solved my problem , here is what I've got. I just have to
>>> correct some things. By the way, only if someone know quickly the answer.
>>> How can I do a colorbar just using red for high values, and blue for low
>>> values, but only with averaged color between red and blue for the middle
>>> values, not using a completely different color.
>>>
>>> All the best,
>>> Sebastián.
>>>
>>> On Thu, Jul 16, 2015 at 3:16 PM, Dennis Shea <shea at ucar.edu> wrote:
>>>
>>>> The question is rather vague.
>>>>
>>>> What type of "troubles" ?
>>>> Do you have a sample script that you tried?
>>>> What does
>>>>
>>>> ncl_filedump ...GFS_file ...
>>>>
>>>> show?
>>>>
>>>> On Thu, Jul 16, 2015 at 2:08 PM, Sebastian Otarola-Bustos <
>>>> Sebastian.F.Otarola-Bustos.1 at nd.edu> wrote:
>>>>
>>>>> Hi everybody,
>>>>>
>>>>> I've been trying to plot GFS  output variables, mainly, HGT,TMP,UGRD
>>>>> &VGRD for different isobaric levels, but I'm having lot of troubles. If
>>>>> somebody has a script that do similar things, and could share it with me,
>>>>> it would be really really appreciated. Or if somebody knows where I can
>>>>> find an example, it would be also appreciated.
>>>>>
>>>>>
>>>>> All the best,
>>>>> Thank you very much.
>>>>> Sebastián.
>>>>>
>>>>>
>>>>>
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>>>>
>>>
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