[ncl-talk] Help with line labels

[Laura Fowler]

Hi Adam:

Thanks for sending me an e-mail earlier (to which I replied). As an
experiment, I reverted to ncl choosing the levels instead of choosing
the levels using "Explicit Levels". As expected, the new plot shows a
bunch of contour lines, but without any labels. I also added the lines
draw(plot) and frame(wks). That did not help either. So I am really
baffled as why ncl refuses to add labels to my plot.

Thanks,
Laura




On Fri, Dec 15, 2017 at 4:28 PM, Adam Phillips <asphilli at ucar.edu> wrote:
> Hi Laura,
> I believe NCL will limit the drawing of line labels if it believes they will
> come close to overlapping, although in this case I'm not sure why it doesn't
> simply draw one for each line.
> See example #5 here:
> http://www.ncl.ucar.edu/Applications/contourLab.shtml#ex5
> and try setting cnLineLabelPlacementMode = "constant"
> and see if that helps. Other examples show how to make sure labels are drawn
> on every line (as opposed to the default behavior of skipping every other
> one.), along with other modifications.
> Adam
>
> On Fri, Dec 15, 2017 at 4:16 PM, Laura Fowler <laura at ucar.edu> wrote:
>>
>> Hello:
>>
>> I have been fussing for quite a while on how to draw labels on the
>> contour line of the attached plot. The 3 contours show the resolution
>> of my variable-resolution mesh. The red, blue, and black contours
>> correspond to a resolution of 4.8 km, 9.6, and 14.4 km, respectively.
>> I am not understanding why I am unable to add at least one label per
>> contour?
>>
>> sres = True
>>
>> sres at gsnDraw          = False
>> sres at gsnFrame         = False
>> sres at gsnMaximize      = False
>> sres at cnFillMode       = "AreaFill"
>> sres at cnFillOn         = False
>> sres at cnLinesOn        = True
>> sres at cnLineLabelsOn   = True
>> sres at cnLineThicknessF = 3.4
>> sres at cnInfoLabelOn    = False
>>
>> sres at cnLevelSelectionMode = "ExplicitLevels"
>> sres at cnLevels             = (/4.8,9.6,14.4/)
>> sres at cnMonoLineColor      = False
>> sres at cnLineColors         = (/"red","blue","black"/)
>> sres at cnMonoLevelFlag      = True
>> sres at cnLevelFlag         = "LineAndLabel"
>>
>> There must be something I am missing, or I am getting confused between
>> sres at cnLevelFlag and sres at cnLevelFlags, but I just can't make it work?
>> I know that it may be a little finnicky to add labels at times, ....
>> Would somebody be able to help me out so that I do not have to add
>> those labels in PowerPoint. If interested, my entire ncl script is in
>>
>> /glade2/scratch2/laura/MPAS.PacificOcean/plots.centeredPacificOceanMesh.15-3km.20151129-20151231
>> (see global_mean.precipitation.ncl).
>>
>>
>> Many thanks,
>> Laura
>>
>>
>>
>>
>>
>> --
>>
>> !-------------------------------------------------------------------------------------------------------------
>> Laura D. Fowler
>> Mesoscale and Microscale Meteorology Division (MMM)
>> National Center for Atmospheric Research
>> P.O. Box 3000, Boulder CO 80307-3000
>>
>> e-mail: laura at ucar.edu
>> phone: 303-497-1628
>>
>>
>> !-------------------------------------------------------------------------------------------------------------
>>
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>
>
>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>



-- 
!-------------------------------------------------------------------------------------------------------------
Laura D. Fowler
Mesoscale and Microscale Meteorology Division (MMM)
National Center for Atmospheric Research
P.O. Box 3000, Boulder CO 80307-3000

e-mail: laura at ucar.edu
phone: 303-497-1628

!-------------------------------------------------------------------------------------------------------------