[ncl-talk] Make zero white in colour bar
Barry Lynn
barry.h.lynn at gmail.com
Wed Aug 2 07:03:08 MDT 2017
You can remove one interval and one "whilte."
On Wed, Aug 2, 2017 at 4:02 PM, Barry Lynn <barry.h.lynn at gmail.com> wrote:
> Hi:
>
> You need to set your classes.
>
> res1 at cnLevelSelectionMode = "ExplicitLevels" ; set explicit
> contour levels
>
> res1 at cnLevels = (/ 000, 1,5, 10., 15., \
>
> 20, 30,40,50,75,100/)
>
> res1 at cnFillColors = (/"White","White","AntiqueWhite","AntiqueWhite3",
> \
>
> "chartreuse", \
>
> "chartreuse3","ForestGreen", \
>
> "Yellow","Orange","Red","
> HotPink3","HotPink1","HotPink","Violet"/)
>
> On Wed, Aug 2, 2017 at 3:59 PM, Michael Weston <mjweston at masdar.ac.ae>
> wrote:
>
>> Hi Barry
>>
>> So I can define the classes manually as below (although this is a
>> tradeoff):
>>
>> res at cnLevelSelectionMode = "ManualLevels"
>> res at cnMinLevelValF = 0.1 ; set min contour level
>> res at cnMaxLevelValF = 1 ; set max contour level
>> res at cnLevelSpacingF = 0.1 ; set contour spacing
>>
>> res at lbLabelStrings = (/"0.1","0.2","0.3","0.4","0.5
>> ","0.6","0.7","0.8","0.9","1"/)
>> But it still creates a purple box in the color bar.
>> Is this what you had in mind?
>>
>> Thanks
>> Mike
>>
>>
>> On 02/08/2017 16:41, Barry Lynn wrote:
>>
>> 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_colo
>>>> r_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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>>>> received this transmission in error, please notify us immediately by e-mail
>>>> at *info at masdar.ae <info at masdar.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 <%28914%29%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 <(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 <(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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