[ncl-talk] labelbar
Kreienkamp Frank
Frank.Kreienkamp at dwd.de
Fri Jun 7 01:16:58 MDT 2019
Hello Rick, Hello Barry,
thanks for your help.
@ Rick: we all have full load off work. Any help, even with a few days offset is thankfully appreciated.
Reading the comment from Rick, i would like to ask NCAR/UCAR if it is possible to add two more options to cnLabelBarEndStyle. One forcing the system to plot the min/max-label even if there is no value at one or both ends. Second: one option where I can define min/max/step and a color Palette and the system plot this configuration as defined.
The background for this question is simple. If I plot a changing information over time I want to use the same color bar. In the current setting (and me limited understanding) this is limited to color-palettes having an additional color at both ends. If I have a color palette going from white over grey to black I would need one additional ultra white on one side and the opposite on the other end.
Frank
Von: Barry Lynn [mailto:barry.h.lynn at gmail.com]
Gesendet: Donnerstag, 6. Juni 2019 21:03
An: Rick Brownrigg
Cc: Kreienkamp Frank; ncl-talk at ucar.edu
Betreff: Re: [ncl-talk] labelbar
Hello:
I don't know if this will help, but here is snippet of code I use to label my label bars.
levels= (/10,20,30,40,50,60/)
n_colors = 7
sres_colors = (/ \
"SpringGreen1", \
"SpringGreen4", \
"Yellow","Orange","Red1","HotPink1","Violet"/)
sres at cnLevels = (/15,25,35,45,55/)
sres at cnFillOpacityF = 0.80
sres at cnFillColors = sres_colors
sres at lbLabelAlignment = "BoxCenters"
sres at lbLabelStrings = (/"10-20","20-30","30-40","40-50","50-60","> 60"/)
On Thu, Jun 6, 2019 at 8:28 PM Rick Brownrigg <brownrig at ucar.edu<mailto:brownrig at ucar.edu>> wrote:
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<mailto: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<mailto:brownrig at ucar.edu>]
Gesendet: Montag, 3. Juni 2019 14:44
An: Kreienkamp Frank
Cc: ncl-talk at ucar.edu<mailto: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<mailto: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<mailto:Frank.Kreienkamp at dwd.de>]
Gesendet: Mittwoch, 29. Mai 2019 09:15
An: Barry Lynn; Kreienkamp Frank
Cc: ncl-talk at ucar.edu<mailto: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.
[cid:image002.png at 01D515F2.EC6CCD40]
Frank
Von: Barry Lynn [mailto:barry.h.lynn at gmail.com<mailto:barry.h.lynn at gmail.com>]
Gesendet: Mittwoch, 29. Mai 2019 08:25
An: Kreienkamp Frank
Cc: ncl-talk at ucar.edu<mailto: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<mailto: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.
[cid:image001.png at 01D51D0F.3B35E380]
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
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
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_______________________________________________
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ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
--
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
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
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