[ncl-talk] Wind Barbs cross equator issue

[Jianyu Liu]

Hi,


I'm using NCL 6.3.0,  just noticed there was an issue for the Wind Barbs cross equator that gsn_csm_vector does not currently automatically change the wind barb tick position to account for the conventional difference for north and south of the equator.


I knew it could manually change the resource vcWindBarbTickAngleF to a negative value to get wind barbs that conform to the southern hemisphere convention, but this does not help for plots that cross the equator where both conventions are needed.   Please see the attachment for the example.


Here are my settings for the Wind Barbs


  opts at gsnLeftStringFontHeightF  = 0
  opts at gsnRightStringFontHeightF = 0
  opts at vcRefMagnitudeF           = 10.0             ; define vector ref mag
  opts at vcRefLengthF              = 0.030           ; define length of vec ref
  opts at vcGlyphStyle              = "WindBarb"         ; select wind barbs
  opts at vcMinDistanceF            = 0.02              ; thin out windbarbs
  opts at vcVectorDrawOrder         = "PostDraw"
  opts at vcRefAnnoOrthogonalPosF   = -1.08


Wondering if I'm missing certain settings or what's the workaround for this sort of issue ?


Thanks for your time


Regards


Jerry


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180607/766b180a/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Wind_Barbs_Cross_Equator.png
Type: image/png
Size: 513803 bytes
Desc: Wind_Barbs_Cross_Equator.png
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180607/766b180a/attachment-0001.png>