[ncl-talk] Gap in a plot

[Anahita Amiri Farahani]

Hi all,

I plotted change in the low cloud as a difference between two simulations
and added the 95% confidence level but the problem is there is a band that
significant values are not shown. it is around 180 degrees longitude.
Attached is the figure, and here is the code that I used:


wks = gsn_open_wks("eps","low_cloud_summer")
 gsn_define_colormap(wks,"BlWhRe")   ; choose color
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  res                     = True               ; plot mods desired
  res at cnFillOn            = True              ; turn on color
  res at gsnSpreadColors     = True               ; use full color map
  res at cnLinesOn           = False              ; no contour lines
  res at cnLineLabelsOn      = False              ; no line labels



  ;res at gsnAddCyclic        = False
  res at gsnDraw             = False           ; don't draw
  res at gsnFrame            = False           ; don't advance frame
  res at cnInfoLabelOn       = False           ; turn off cn info label
  res at cnFillOn            = True            ; turn on color
  res at gsnSpreadColors     = True            ; spread out color table
  res at gsnSpreadColorStart = 2               ; color to startt

  res at lbLabelBarOn        = False           ; turn off individual cb's


 res at cnLevelSelectionMode =  "ManualLevels"   ; AutomaticLevels
  res at cnMinLevelValF       = -20.              ; min level
  res at cnMaxLevelValF       =  20.              ; max level
  res at cnLevelSpacingF      =  2               ; interval

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
res at tiMainString        = " Summer changes in low clouds" ;Cloud Fraction
Derivative fall

plot= gsn_csm_contour_map(wks,low_summer,res)
;delete(wks)
; ========================= PLOT 2 ==============================
 res2 = True                            ; res2 probability plots


  res2 at gsnDraw              = False           ; Do not draw plot
  res2 at gsnFrame             = False           ; Do not advance frame

  res2 at cnInfoLabelOn       = False       ; turn off info label

  res2 at cnLinesOn           = False       ; do not draw contour lines
  res2 at cnLineLabelsOn      = False       ; do not draw contour labels

  res2 at cnFillScaleF        = 0.6         ; add extra density
;;  delete(alpha at long_name)
;;  delete(alpha at units)

  plot2   = gsn_csm_contour(wks,alphat_low_summer, res2)
  plot2   = ShadeGtContour(plot2, 0.05, 17)  ; shade all areas less than the
                                             ; 0.05 contour level
  overlay (plot, plot2)

  draw (plot)
  frame(wks)
  delete(wks)
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