[ncl-talk] Plotting overlay plot with significance values

[Sri Nandini]

Hello

I am trying to plot seasonal (DJF, MAM, JJA, SON) temperature values with thier ttest values (all already calculated and saved in netcdf file).

I attach my plotting script below:
And my error is: 
Argument type mismatch on argument (1) of (gsn_csm_contour_map_polar) can not coerce

Would appreciate any advice on why the plot turns out like this, see attached.

; Reading all seasonal differences and ttest, then overlaying on each plot with the caspian basin shapefile to show the 95% or 99% significance levels


  latS   =  30.                ; N. Hemisphere
  latN   =  90. 

ADD_SHAPEFILE_OUTLINES = True
  sname = "Caspian_Basin.shp"

; ==============================================================
; Open the files:Read all the seasonal differences and ttest values 
; ==============================================================
f     = addfile ("T2M_BC_DJF_Diff.nc", "r")
T1diff    = f->T1diff

f2 = addfile("T2M_BC_MAM_Diff.nc","r")
T2diff    = f2->T2diff

f3 = addfile("T2M_BC_JJA_Diff.nc","r")
T3diff    = f3->T3diff

f4 = addfile("T2M_BC_SON_Diff.nc","r")
T4diff    = f4->T4diff

;==================================================================
f5 = addfile("T2M_BC_DJF_ttest.nc","r")
probt1    = f5->probt1

f6 = addfile("T2M_BC_MAM_ttest.nc","r")
probt2    = f6->probt2

f7 = addfile("T2M_BC_JJA_ttest.nc","r")
probt3    = f7->probt3

f8 = addfile("T2M_BC_SON_ttest.nc","r")
probt4    = f8->probt4

;=====================================================================Start the graphics
  wks = gsn_open_wks("png","T2M_BC_seasons_diff_ttest_")

  res                     = True
  res at gsnDraw             = False
  res at gsnFrame            = False
  res at cnFillPalette       = "BlWhRe"            ; select a color map with white in the 
  res at gsnPolar            = "NH"
  res at mpGridAndLimbOn     = "False"             ; turn off lat/lon lines
  res at mpFillOn            = False               ; turn off map fill

  res at mpMinLatF            = latS               ; zoom in on map
  res at mpMaxLatF            = latN

  res at cnLevelSelectionMode = "ManualLevels"     ; manual set levels
  res at cnMinLevelValF       =-3
  res at cnMaxLevelValF       = 3
  res at cnLevelSpacingF      = 0.5                ; contour levels   
  
  res at cnFillOn             = True
  res at cnLinesOn            = False
  res at cnLineLabelsOn       = False
  res at cnFillDrawOrder      = "Predraw"          ; fill and lines before map
  res at mpDataBaseVersion    = "MediumRes"        ; use GMT coastline

  res at mpGridAndLimbOn      = False              ; set to true if you want grid lines to show
  res at lbLabelBarOn         = False              ; turn off individual label bars
  ;res at cnRasterModeOn      = True               ; Raster mode shows grid cells
  res at gsnRightString       = ""                 ; Turn off subtitles
  res at gsnLeftString        = ""

;==================================Create arrays to hold series of plots
    plots = new(4,graphic)   
 
 plots(0)  = gsn_csm_contour_map_polar(wks,T1diff,res)

 plots(1)  = gsn_csm_contour_map_polar(wks,T2diff,res)

 plots(2)  = gsn_csm_contour_map_polar(wks,T3diff,res)

 plots(3)  = gsn_csm_contour_map_polar(wks,T4diff,res)
  printVarSummary(plots)

;=====================================================================
;Second plot resources and overlay onto first
;=====================================================================
  res2 = True                            ; res2 probability plots
  res2 at gsnDraw             = False       ; Do not draw plot
  res2 at gsnFrame            = False       ; Do not advance frome

  res2 at cnLevelSelectionMode = "ExplicitLevels"       ; set explicit cnlev
  res2 at cnLevels   = (/99./)              ; only have 1 contour level
  res2 at cnInfoLabelOn       = False
  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

  res2 at gsnRightString      = ""          ; Turn off subtitles
  res2 at gsnLeftString       = ""                                 
  res at gsnAddCyclic         = True        ; add cyclic point

;========================================================================
  opt = True                                         ; set up parameters for pattern fill
  opt at gsnShadeFillType = "pattern"                   ; specify pattern fill
  opt at gsnShadeHigh      = 17                         ; stipple pattern
  opt at gsnShadeDotSizeF = 1                           ; make dots larger

;==================================Create arrays to hold series of ttests or make a loop
    plot2 = new(4,graphic)   
 
 plot2(0)  = gsn_csm_contour(wks,probt1,res2) 

 plot2(1)  = gsn_csm_contour(wks,probt2,res2) 

 plot2(2)  = gsn_csm_contour(wks,probt3,res2) 

 plot2(3)  = gsn_csm_contour(wks,probt4,res2) 
  printVarSummary(plot2)
;==========================================================================cycle through seasons
season = (/"DJF","MAM","JJA","SON"/)
nof=4

do mm=0,nof-1
  res at gsnCenterString = season(mm)

  plots(mm)   = gsn_csm_contour_map_polar(wks,plots(mm),res)
  plot2(mm)   = gsn_contour_shade(plot2(mm),1,99., opt)        ; stipple all areas >= 99%  contour    
   
  overlay (plots (mm), plot2 (mm))
end do

  printVarSummary(plots)
  printVarSummary(plot2)

;=====================================
;Attach the polylines and shape
;=====================================
   pres             = True
   pres at gsLineColor = "black"
   pres at gsLineThicknessF = 2.0                ; 2x thickness
   shp1 = gsn_add_shapefile_polylines(wks,plots,sname,pres) 
   printVarSummary(shp1)

;==================================
; panel resources for the 4 plots
;==================================
  pres1                     = True             ; modify the panel plot
  pres1 at gsnPanelLabelBar    = True             ; common label bar
  pres1 at gsnFrame            = False            ; don't advance frame yet
  pres1 at lbOrientation       = "Vertical"       ; vertical label bar
  pres1 at gsnPanelMainString  = "T2m BigCaspian-NoCaspian Seasonal Difference"     
  pres1 at lbBoxEndCapStyle  = "TriangleBothEnds" ; Added in NCL V6.4.0
  pres1 at gsnMaximize         = True             ; large format

   gsn_panel(wks,plots,(/2,2/),pres1)

   draw (plots)
   frame(wks)



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