[ncl-talk] Make zero white in colour bar
Barry Lynn
barry.h.lynn at gmail.com
Wed Aug 2 06:41:47 MDT 2017
Hi:
The easiest thing to do is just define your color bar manually, and your
intervals not to include 0. You then set the leftward most color to white.
I am not sure if there is an easier way.
Do you need help with this?
Barry
On Wed, Aug 2, 2017 at 3:31 PM, Michael Weston <mjweston at masdar.ac.ae>
wrote:
> Hi
> No not really. What line in the code is causing it to be included?
> My understanding from both these lines is that it starts at zero.
>
> res at cnLevels = fspan(0,1,10)
> ...
> res at lbLabelStrings = (/"0","0.1","0.2","0.3","0.4",
> "0.5","0.6","0.7","0.8","0.9","1"/)
>
> Mike
>
>
> On 02/08/2017 16:21, Barry Lynn wrote:
>
> Hi:
>
> Do you really want to include the < 0 part of your color bar?
>
> On Wed, Aug 2, 2017 at 2:51 PM, Michael Weston <mjweston at masdar.ac.ae>
> wrote:
>
>> Dear NCL users,
>>
>> This question has been asked many times. However, I wonder if a more
>> elegant solution has been found in the mean time.
>> E.g subjects in this group, but these do not answer my question
>>
>> Making zero value white in contour plot (Jake Huff)
>> Re: Making zero value white in contour plot (Mary Haley)
>> Re: Making zero value white in contour plot (Dennis Shea)
>>
>> I have also tried:
>> Getting the colour index (*get_color_index*), setting the colour index
>> to another colour using *NhlSetColor*
>>
>> I have tried these links
>> "How to coincide zero with the white color of the colo bar with uneven
>> numbering"
>> http://mailman.ucar.edu/pipermail/ncl-talk/2014-November/001361.html
>> This involves indexing a 256 color palette to the colours you want in
>> your 16 level map/color bar.
>>
>> combined with
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/get_color_index.shtml
>>
>> However, none have really hit the nail on the head despite my efforts.
>> And I imagine this must be much simpler than indexing a 256 color scheme.
>>
>> What I want:
>> 1. I want to make a map using filled contours, but I want zero to be
>> represented by white.
>> I can achieve this by making all zero values missing values.
>> 2. I want to have a color bar next to my map, with zero represented by
>> white.
>> I can not achieve this.
>>
>> My map is attached.
>> As you can see it is beautiful, except, I would like to get rid of the
>> delightful purple and dark blue in the color bar. (i.e. first two classes.)
>>
>> Is this possible?
>>
>> Thanks and regards
>> Michael
>>
>>
>> general overview of code below
>>
>> sfile = addfile(srcFileName,"r")
>> TMP = sfile->var_index
>> TMP = where(TMP.ne.0,TMP,TMP at _FillValue) ;MAKE ZERO MISSING
>>
>> res at cnFillOn = True
>> res at cnFillMode = "RasterFill" ; Raster Mode
>> res at cnConstFEnableFill = True
>> res at cnLinesOn = False
>> res at cnLineLabelsOn = False
>>
>> res at cnLevelSelectionMode = "ExplicitLevels"
>> res at cnLevels = fspan(0,1,10)
>> cmap = read_colormap_file("BlueYellowRed")
>> res at lbLabelBarOn = True
>> res at lbLabelStrings = (/"0","0.1","0.2","0.3","0.4",
>> "0.5","0.6","0.7","0.8","0.9","1"/)
>> res at lbOrientation = "Vertical"
>> wks = gsn_open_wks("png","ncl_map")
>> plot = gsn_csm_contour_map(wks,TMP,res)
>> draw(plot)
>> frame(wks)
>> delete(wks)
>>
>> --
>>
>> *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
>>
>>
>> *Please consider the environment before printing this email*
>>
>> This transmission is confidential and intended solely for the person or
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>>
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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>
>
>
> --
>
> *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
>
>
> *Please consider the environment before printing this email*
>
> This transmission is confidential and intended solely for the person or
> organization to whom it is addressed. It may contain privileged and
> confidential information. If you are not the intended recipient, you should
> not copy, distribute or take any action in reliance on it. If you have
> received this transmission in error, please notify us immediately by e-mail
> at *info at masdar.ae <info at masdar.ae>**.*
>
--
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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