[ncl-talk] Make zero white in colour bar

[Barry Lynn]

Hi:

Thank you for taking a look.

It is WPS 6.3.

I am trying to ftp to the ftp site, but after opening once, it won't open
again (and it didn't accept my password).

ftp ftp.cgd.ucar.edu (can't enter).

You can take any wrf output file (the only thing is that you need to make
sure that lats/lons settings are within the domain.  The other thing is to
set fft_zh to QCLOUD, for example.

The plot doesn't matter, just that it should read one time step and make
the color bar incorrectly.

Barry



On Thu, Sep 28, 2017 at 6:13 PM, Mary Haley <haley at ucar.edu> wrote:

> Hi Barry,
>
> I couldn't reproduce your problem using a toy script. What version of NCL
> are you using?
>
> Can you upload the wrf output file so I can try running your script?
>
> http://www.ncl.ucar.edu/ftp_files.shtml
>
> Thanks,
>
> --Mary
>
>
> On Thu, Sep 28, 2017 at 8:21 AM, Barry Lynn <barry.h.lynn at gmail.com>
> wrote:
>
>> Hi:
>>
>> I need to follow up.
>>
>> radar_panel.. plots nc data from the Weather Climate and Tool Kit (anyone
>> is welcome to use -- but I am not finished with that part of the program to
>> remove attenuation).
>>
>> The other program plots WRF radar data.
>>
>> I have attached data from the mapping of radar observations (KOKX) and
>> the WRF output.
>>
>> The radar observations have white space around a 150 km radius because
>> the data is undefined.
>>
>> I tried to do the same for the WRF output following Mary's suggestion.
>> However, there are two problems: i) even though I use the same "NCV_jet"
>> and ispan values in each, the color bar in the WRF mapping is not the same
>> (it needs to be redder on the right hand side).  ii) I would expect white
>> coloring in the first (leftmost) part of the colorbar, but this doesn't
>> seem to work correctly either. Both problems are probably related.
>>
>> Thank you,
>>
>> Barry
>>
>> On Sun, Aug 6, 2017 at 9:53 AM, Michael Weston <mjweston at masdar.ac.ae>
>> wrote:
>>
>>> Thank you Mary!
>>>
>>> That is a much better approach :)
>>> Regards
>>> Michael
>>>
>>> On 04/08/2017 20:05, Mary Haley wrote:
>>>
>>> Hi Mike (and Barry),
>>>
>>> Just an FYI: I don't think you need to use cnFillColors. You can simply
>>> read the colormap you want, set the first color to white, and then load
>>> this new colormap using cnFillPalette:
>>>
>>>     cmap = read_colormap_file("BlueYellowRed")
>>>     cmap(0,:) = 1.   ; Make first color white
>>>
>>>     res at cnLevelSelectionMode = "ExplicitLevels"    ; set explicit
>>> contour levels
>>>     res at cnLevels        = (/0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1/)  ;
>>> 10 levels
>>>     res at cnFillPalette  = cmap
>>>
>>> If you want the first color to be transparent rather than white, then
>>> use:
>>>
>>>     cmap(0,3) = 0,0   ; Make first color transparent
>>>
>>> Cheers,
>>>
>>>
>>> --
>>>
>>> *Michael* *Weston*
>>> Research Engineer
>>>
>>>
>>> *A Part of Khalifa University of Science and Technology*
>>>
>>> PO Box 54224, Abu Dhabi,
>>> United Arab Emirates
>>> Office   +971 2 810 9510 <+971%202%20810%209510>
>>>
>>> Email   mjweston at masdar.ac.ae
>>>  http://www.masdar.ac.ae
>>>
>>>
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>>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>> US 914 432 3108 <(914)%20432-3108>
>>
>
>


-- 
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
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