[ncl-talk] Make zero white in colour bar
Barry Lynn
barry.h.lynn at gmail.com
Fri Aug 4 12:31:09 MDT 2017
Hi Mary:
Thank you for *filling* us in.
Barry
On Fri, Aug 4, 2017 at 7:05 PM, Mary Haley <haley at ucar.edu> 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,
>
> --Mary
>
>
>
>
> On Wed, Aug 2, 2017 at 8:45 AM, Michael Weston <mjweston at masdar.ac.ae>
> wrote:
>
>> Hi Barry
>>
>> Here we go;
>>
>> 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
>> cmap = read_colormap_file("BlueYellowRed")
>> mycol = span_color_indexes("BlueYellowRed",11) ; levels+1
>> myind = reshape(mycol,11) ;
>> reshape array so that cnFillColors is happy later
>> myind(0) = 0
>> ; set first colour to background colour, which is white in this case. 0 is
>> an index number for the palette
>> res at cnFillColors = (/ myind /)
>>
>> Output is attached.
>>
>> Thanks for your help on this.
>>
>> Cheers
>>
>> Mike
>>
>> On 02/08/2017 17:32, Barry Lynn wrote:
>>
>> Hi:
>>
>> You need to define things, so I guess you're/we're stuck.
>>
>> I am not sure about the "Span" index line -- someone else will have to
>> answer.
>>
>> Barry
>>
>> On Wed, Aug 2, 2017 at 4:28 PM, Michael Weston <mjweston at masdar.ac.ae>
>> wrote:
>>
>>> Hi Barry
>>>
>>> Thanks for this. Yes, while is does achieve white in the first block
>>> (see attached), I was actually trying to avoid defining each colour of each
>>> block individually.
>>>
>>> If I adapt this approach, I could use *get_color_index *and loop
>>> through my levels. Get the named colour of each level. And then recreate
>>>
>>> icol = get_color_index(cmap,levels,0)
>>>
>>> res1 at cnFillColors = (/"White", cmap[icol_1],cmap[icol_2],etc,
>>> ...,cmap[icol_10]/)
>>>
>>> I was hoping to there was a cleaner approach something like:
>>>
>>> res at cnFillColors = (/"White",*span_color_indexes*("BlueYellowRed
>>> ",10)[1:9]/) ; I know syntax is not ncl correct here but hope you get
>>> my drift
>>>
>>> Is this possible?
>>>
>>> Mike
>>>
>>>
>>>
>>> On 02/08/2017 17:03, Barry Lynn wrote:
>>>
>>> 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","HotPi
>>>> nk3","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
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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>**.*
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> ncl-talk mailing list
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>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 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 <%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 <%28914%29%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 <%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>**.*
>>
>> _______________________________________________
>> ncl-talk mailing list
>> ncl-talk at ucar.edu
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>>
>
--
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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