[ncl-talk] polygon now showing up in the polar plot

[Ipshita Majhi]

Dear All,

I am trying to plot a polygon on a polar plot but it is not showing up

;************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
;************************************************
begin
;************************************************
; read in netCDF file and access data
a =addfile("~/Documents/Snow_cover_IMS/nhsce_v01r01_19661004_20140602.nc
","r");
  sce=a->snow_cover_extent(0,:,:)
 lat=a->latitude
 lon=a->longitude


 sce at lat2d=lat
 sce at lon2d=lon
                                 ;
;************************************************
; create polygon (remember the earth is a sphere)
;************************************************
  xpt = new(20,float)
  ypt = new(20,float)

  xpt(0:9)     = fspan(120,-120,10)  ; lon around edge
  xpt(10:14)   = -180                ; up 240
  xpt(15:19)   = 120                 ; down 120

  ypt(0:9)     = 40                  ; lat around edge
  ypt(10:14)   = fspan(40.,90.,5)    ; lat up to pole
  ypt(15:19)   = fspan(90.,40.,5)    ; lat down from pole
;************************************************
; create plots
;************************************************
  wks = gsn_open_wks("ps" ,"sce_polar_polygon")              ; create ps
plot
   res            = True                          ; plot mods desired
  res at gsnPolar   = "NH"                          ; specify the hemisphere
  plot = gsn_csm_contour_map_polar(wks,sce,res)    ; create the plot


 dum1 = gsn_add_polygon(wks,plot,xpt,ypt,False) ; add polygon
end
;***********************************************
Best Regards
Ipshita
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