[ncl-talk] Make zero white in colour bar
Michael Weston
mjweston at masdar.ac.ae
Wed Aug 2 06:31:32 MDT 2017
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
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>
> Email mjweston at masdar.ac.ae <mailto:mjweston at 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
>
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--
*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
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have received this transmission in error, please notify us immediately
by e-mail at *info at masdar.ae**.*
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