[ncl-talk] Make zero white in colour bar

[Barry Lynn]

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
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>
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>  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
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