Re: Problem with common label bar and gsn_csm_vector_scalar_map_polar panel plot

Hi Eowyn,
I believe you've found a bug. I copied your resource list and used some
data I have here, and I see the same thing you are seeing: the panel
label bar drawing is just weird. There is no way to get it without
drawing a label bar for at least one of the panels.

Here's the work around:
Before you create plot(3), add the following 2 lines:
   res@lbLabelBarOn = True
   res@pmLabelBarOrthogonalPosF = 0.30

This effectively pushed the label bar created for the 4th plot off of
the page, and you're left with the panel label bar. I'll send an example
of this to the ncl developers...
Adam

On 07/15/2010 11:07 AM, Eowyn Connolly-Brown wrote:
> Hello all,
>
> I've searched the archives & examples and haven't found an example of a
> common label bar for a panel plot composed of vectors overlaid on a
> field, where the label bar matches the field. If you know of such an
> example, please send it my way! Otherwise here is my question:
>
>
> I am creating plots of a field overlaid with wind vectors via:
>
> plot= gsn_csm_vector_scalar_map_polar(wks,u,v,var,res)
>
> These are arranged in a panel plot, one panel for each season, eg:
>
>
> res = True
> res@gsnDraw = False ; don't draw
> res@gsnFrame = False ; don't advance frame
> res@gsnPolar = "NH" ; specify the hemisphere
> gsn_define_colormap(wks,"wgne15")
> res@mpMinLatF = 30
> res@mpFillOn = False
>
> res@cnFillOn = True ; color fill
> res@cnLevelSpacingF = 3. ; interval spacing
> res@cnLinesOn = False ; no contour lines
>
> res@gsnScalarContour = True ; vectors over scalars
> res@vcRefMagnitudeF = 20.0 ; vec magnitude
> res@vcRefLengthF = 0.04 ; size of ref vector
> res@vcLineArrowColor = "white" ; white vectors
> res@vcMinDistanceF = 0.02 ; thins arrows near pole
> res@vcGlyphStyle = "CurlyVector" ; turns on curley vectors
>
> res@vcRefAnnoArrowLineColor = "black" ; black ref vector
> res@vcRefAnnoArrowUseVecColor = False
>
> res@gsnSpreadColors = True ; use full colormap
> res@gsnSpreadColorStart = 2
> res@gsnSpreadColorEnd = -3
>
> res@cnLevelSelectionMode = "ManualLevels" ; set manual contour levels
> res@cnMinLevelValF = 0 ; set min contour level
> res@cnMaxLevelValF = 20 ; set max contour level
> res@cnLevelSpacingF = 2. ; set contour spacing
> res@lbLabelBarOn = False
>
>
> plot(0)= gsn_csm_vector_scalar_map_polar(wks,u,v,varDJF,res)
> plot(1)= gsn_csm_vector_scalar_map_polar(wks,u,v,varMAM,res)
> plot(2)= gsn_csm_vector_scalar_map_polar(wks,u,v,varJJA,res)
> plot(3)= gsn_csm_vector_scalar_map_polar(wks,u,v,varSON,res)
>
> resP = True ; modify the panel plot
> resP@gsnPanelLabelBar = True ; add common colorbar
> resP@lbTitleString ="kg/m2/s"
> resP@lbTitlePosition="Bottom"
> resP@lbAutoManage = False
> resP@lbTitleFontHeightF= 0.010
> resP@lbLabelFontHeightF= 0.01
> resP@txString = VAR+" NAO+ composite"
> gsn_panel(wks,plot,(/2,2/),resP) ; now draw as one plot
>
>
>
> Here is the problem: If res@lbLabelBarOn = False then there will be no
> common label bar, even though resP@gsnPanelLabelBar = True . Yet if
> res@lbLabelBarOn = True and resP@gsnPanelLabelBar = True , each
> individual plot has its own label bar (expected) and suddenly there is a
> common label bar, too! What's going on here? I suspect the
> gsnPanelLabelBar resource doesn't know whether to make a label bar for
> the vectors or the colored contours (since this problem only appears
> when the overlaid vectors are included). Interestingly, even if only one
> of the 4 plots has vectors, the problem appears. Please see attached
> images to see what I'm talking about.
>
> Has anyone else encountered this problem before? Any ideas how to fix it?
>
> Thanks in advance. I'm a summer student, new to NCL, and I really
> appreciate the help.
>
> Cheers,
> Eowyn
>
>
>
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-- 
__________________________________________________
Adam Phillips 
asphilli@ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli
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