[ncl-talk] labelbar
Rick Brownrigg
brownrig at ucar.edu
Thu Jun 6 11:28:11 MDT 2019
Hi Frank,
Apologies for the delay in response -- I've been in a hectic workshop these
past 3 days. I sat down to look at this problem. Indeed, the source of the
warning message is that one of the labelbar end-values is a space. In
looking into how that comes to be, I stumbled across this note in the docs
for cnLabelBarEndStyle:
IncludeMinMaxLabels The two end boxes represent the fill color and/or
patterns used for areas of the plot where the data is below the minimum
contour level or above the maximum contour level. The first and last
labels, representing the minimum and maximum values in the field, are
aligned with the exterior boundaries of the outer boxes. However, if the
minimum and/or maximum field values fall within the range specified by the
minimum and maximum contour levels, one or both of these labels will be set
to an empty string.
The range of data values in this particular example is on the order of -29
... -14.5 Indeed, if I set the min/maxLevelVals to something like -25/-15,
I do get a labelbar that has the outer edges labelled.
So, it seems the code is behaving in a manner intended, and I'm not sure
what to suggest. You could force the issue by explicitly labeling the
labelbar, if you really want a guaranteed span of values.
I wish I had a better answer...
Rick
On Mon, Jun 3, 2019 at 11:22 PM Kreienkamp Frank <Frank.Kreienkamp at dwd.de>
wrote:
> Hello Rick,
>
>
>
> i have now a complete example (ncl, data, colortable).
>
>
>
> The target is to have a label bar covering 9 colors with labels on both
> ends and being based on a min, max, step definition and a 9 step color
> table.
>
>
>
> Frank
>
>
>
> *Von:* Rick Brownrigg [mailto:brownrig at ucar.edu]
> *Gesendet:* Montag, 3. Juni 2019 14:44
> *An:* Kreienkamp Frank
> *Cc:* ncl-talk at ucar.edu
> *Betreff:* Re: [ncl-talk] labelbar
>
>
>
> Hi,
>
>
>
> The place in the code where the warning message is issued is guarded by
> this conditional:
>
>
>
>
> if(end_labels_on.and.end_labelbar_style.eq.get_enum_value("IncludeMinMaxLabels").and.
> \
> (lbstrings(0).eq."".or.lbstrings(nlab-1).eq."")) then
>
>
>
> It appears as though at least one of the end-labels is blank. Its not
> clear to me why, and I would need your code and datasets in order to track
> this down. (BTW: I a bit puzzled by the narrowing of the label range -- I
> might have thought widening it was in order; e.g., -135 - 15. / 0 + 15. ??)
>
>
>
> Rick
>
>
>
> On Mon, Jun 3, 2019 at 12:50 AM Kreienkamp Frank <Frank.Kreienkamp at dwd.de>
> wrote:
>
> Hello,
>
>
>
> to solve my problem can change the Min and Max value to
>
> Min + cnLevelSpacingF
>
> Max – cnLevelSpacingF
>
> and using res at cnLabelBarEndStyle = " IncludeMinMaxLabels"
>
>
>
>
> unfortunately I get an warning:
>
> (0) Warning: add_labelbar: invalid end labels, turning them off.
>
>
>
> The colors are shown all. But no labeling at the ends. (NCL version 6.4.0)
>
>
>
> ;************************************************
>
> ; adding color definition
>
> res at cnFillPalette = "NCL_DWD_RedYellow"
>
> ;************************************************
>
> ; adding map
>
> res at cnFillOn = True ; color Fill
>
> res at cnFillMode = "RasterFill" ; Raster Mode
>
> res at cnLinesOn = False ; Turn off
> contour lines
>
> res at cnLevelSelectionMode = "ManualLevels"
>
> res at cnMinLevelValF = -135.0 + 15. ; min contour
> level
>
> res at cnMaxLevelValF = 0.0 - 15. ; max contour
> level
>
> res at cnLevelSpacingF = 15.0 ; contour spacing
>
> res at cnLabelBarEndStyle = "IncludeMinMaxLabels"
>
> ;res at cnLabelBarEndStyle = "IncludeMinMaxLabels"
> ;"ExcludeOuterBoxes" ; no additional ColorBoxes
>
> res at gsnAddCyclic = False ; regional
> data: not cyclic
>
> ;************************************************
>
> ; Plot will just be created, and not drawn yet.
>
> plot = gsn_csm_contour_map(wks,u,res)
>
>
>
>
>
> Frank
>
>
>
>
>
> *Von:* Kreienkamp Frank [mailto:Frank.Kreienkamp at dwd.de]
> *Gesendet:* Mittwoch, 29. Mai 2019 09:15
> *An:* Barry Lynn; Kreienkamp Frank
> *Cc:* ncl-talk at ucar.edu
> *Betreff:* AW: [ncl-talk] labelbar
>
>
>
> Hello,
>
>
>
> if you look at the included labelbar you can see that two colors are shown
> twice (position 2+3 and 7+8). The two other colors from the palette are not
> shown.
>
>
>
> [image: cid:image002.png at 01D515F2.EC6CCD40]
>
>
>
> Frank
>
>
>
> *Von:* Barry Lynn [mailto:barry.h.lynn at gmail.com]
> *Gesendet:* Mittwoch, 29. Mai 2019 08:25
> *An:* Kreienkamp Frank
> *Cc:* ncl-talk at ucar.edu
> *Betreff:* Re: [ncl-talk] labelbar
>
>
>
> Hi:
>
>
>
> Could you please explain in greater detail what you mean by: "not all
> colors are shown."
>
>
>
> Thank you,
>
>
>
> On Wed, May 29, 2019 at 8:52 AM Kreienkamp Frank <Frank.Kreienkamp at dwd.de>
> wrote:
>
> Hello,
>
>
>
> i am currently are stuck in a problem. I want to add a labelbar with 9
> colors. Using the following source:
>
>
>
> ;************************************************
>
> ; adding color definition
>
> res at cnFillPalette = "NCL_DWD_RedYellow"
>
> ;************************************************
>
> ; adding map
>
> res at cnFillOn = True ; color Fill
>
> res at cnLevelSelectionMode = "ManualLevels"
>
> res at cnMinLevelValF = -135.0 ; min contour level
>
> res at cnMaxLevelValF = 0.0 ; max contour level
>
> res at cnLevelSpacingF = 15.0 ; contour spacing
>
> res at cnLabelBarEndStyle = "ExcludeOuterBoxes" ; no
> additional ColorBoxes
>
>
>
> the color-palette "NCL_DWD_RedYellow" has 9 colors:
>
> ncolors= 9
>
> # r g b
>
> 102 051 051
>
> 140 039 039
>
> 178 026 026
>
> 216 013 013
>
> 255 000 000
>
> 255 063 000
>
> 255 127 000
>
> 255 191 000
>
> 255 255 000
>
>
>
> Unfortunately not all colors are shown.
>
>
>
>
>
> What do I have to change? I use version 6.4.0.
>
>
>
> Thanks in advance
>
> Frank
>
>
>
>
>
>
>
>
>
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>
>
>
> --
>
> Barry H. Lynn, Ph.D
>
> Senior Associate Scientist, 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
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> Int-IS: x972 2 930 9525
>
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