[ncl-talk] Make zero white in colour bar
Michael Weston
mjweston at masdar.ac.ae
Wed Aug 2 07:35:31 MDT 2017
Hi Barry,
Thanks for your help! I'll try this direction for a little well and
report back if there is any success.
Was hoping to make use of the beautiful palettes rather than creating my
own mixes.
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
> <mailto: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 <mailto: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 <mailto: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 <mailto: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
>>>> <mailto: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
>>>> <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
>>>> <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 <tel:+971%202%20810%209510>
>>>>
>>>> Email mjweston at masdar.ac.ae
>>>> <mailto:mjweston at masdar.ac.ae>
>>>> http://www.masdar.ac.ae <http://www.masdar.ac.ae/>
>>>> **
>>>> /Please consider the environment before
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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 <tel:%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 <tel:+971%202%20810%209510>
>>>
>>> Email mjweston at masdar.ac.ae
>>> <mailto:mjweston at masdar.ac.ae>
>>> http://www.masdar.ac.ae <http://www.masdar.ac.ae/>
>>> **
>>> /Please consider the environment before printing
>>> this email//
>>> /
>>> This transmission is confidential and intended
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>>> us immediately by e-mail at *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 <tel:%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 <tel:+971%202%20810%209510>
>>
>> Email mjweston at masdar.ac.ae <mailto:mjweston at masdar.ac.ae>
>> http://www.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
>> <mailto: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 <tel:%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 <tel:%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 <tel:+971%202%20810%209510>
>
> Email mjweston at masdar.ac.ae <mailto:mjweston at masdar.ac.ae>
> http://www.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 <mailto: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
--
*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
Email mjweston at masdar.ac.ae <mailto:mjweston at masdar.ac.ae>
http://www.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
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