[ncl-talk] Overlay on panel plots

[Nkese Mc Shine]

Good day everyone,

I would like to overlay 12 wind direction vector maps on 12 wind speed maps however I keep getting an error. Can anyone assist?

Thanking you in advance.

Regards,
Nkese.

My script:

;;create plots

wks   = gsn_open_wks("ps","Caribbeanwinds_monthly6")
plot  = new(12,graphic)
plots = new(12,graphic)

  res                             = True
  res at gsnDraw             = False           ; don't draw
  res at gsnFrame           = False           ; don't advance frame
  res at cnFillOn             = True            ; turn on color
  res at gsnMaximize      = True

  cmap = read_colormap_file("BkBlAqGrYeOrReViWh200")
  res at cnFillPalette       = cmap(25:170,:)  ; set color map

  res at cnLinesOn              = False           ; no contour lines
  res at lbLabelBarOn         = False

  res at gsnLeftString          = "Speed"         ; change left string
  res at gsnRightString        = uwnd_practice at units  ; assign right string

  res at mpDataSetName                  = "Earth..4"
  res at mpDataBaseVersion              = "MediumRes"
  res at mpOutlineOn                        = True

  res at mpGeophysicalLineThicknessF = 2
  res at mpNationalLineThicknessF      = 2
  res at mpFillDrawOrder                    = "PostDraw"
  res at mpFillOn                                 = False          ; no map fill

  res at mpMinLatF           = 0
  res at mpMaxLatF          = 30
  res at mpMinLonF          = -110
  res at mpMaxLonF         = -30

  vecres                                = True          ; vector only resources
  vecres at gsnDraw                = False          ; don't draw
  vecres at gsnFrame              = False          ; don't advance frame
  vecres at vcGlyphStyle         = "LineArrow"    ; curly vectors
  vecres at vcRefMagnitudeF  = 10             ; define vector ref mag
  vecres at vcRefLengthF        = 0.045          ; define length of vec ref

  vecres at vcLineArrowThicknessF      = 1
  vecres at vcMinDistanceF                  = 0.05

  vecres at gsnRightString   = " "            ; turn off right string
  vecres at gsnLeftString     = " "            ; turn off left string
  vecres at tiXAxisString      = " "            ; turn off axis label
  vecres at vcRefAnnoOrthogonalPosF = -1.0   ; move ref vector into plot

  months = (/"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug",\
             "Sep","Oct","Nov","Dec"/)

  resP                  = True                           ; panel only resources
  resP at gsnPanelLabelBar = True
  resP at gsnMaximize      = True                ; maximize plots


     do nmo=0,11
         res at gsnCenterString=months(nmo)
         vecres at gsnCenterString=months(nmo)
         plot(nmo)  = gsn_csm_contour_map_ce(wks,wspd_monthly(nmo,:,:),res)
         plots(nmo) = gsn_csm_vector_map(wks,uwnd_monthly(nmo,:,:),vwnd_monthly(nmo,:,:),vecres)
         overlay(plot(nmo),plots(nmo))
         plot       = plot(nmo)
     end do


  gsn_panel(wks,plot,(/3,4/),resP)


Error:
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA
 warning:MapSetTrans: map limits invalid - using maximal area
 fatal:MapSetTrans: error initializing map: MAPINT/MDPINT - MAP HAS ZERO AREA

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