Hi, Everybody
Now I am trying to mark tropical cyclone track overlaid on some shaded fields with "gsn_add_polymarker" and "gsn_add_polyline"
But I am puzzled why I can not add dots and lines on the plot. My NCL scripit is as follows:
***********************************************************************************
.....
sst!0= "lat"
sst&lat = f1->lat
sst!1 = "lon"
sst&lon = f1->lon
sst!2 = "mo"
wks = gsn_open_wks("ps","tt-98-jul") ; open a ps file
gsn_define_colormap(wks,"wh-bl-gr-ye-re") ; choose a colormap
res = True ; use plot options
res@gsnDraw = False
res@gsnFrame = False
res@cnFillOn = True ; Fill contours
res@gsnSpreadColors = True ; use full range of colors
res@mpMaxLatF = 40.
res@mpMinLatF = 0.
res@mpMaxLonF = 140.
res@mpMinLonF = 100.
;adding TC track
y1 = (/17,20,23,25/)
x1 = (/32,29,24,21/)
dot = new(4,graphic)
dot_line = new(4,graphic)
polyres = True
polyres@gsLineThicknessF = 8.0 ; 2.0 thickness of lines
polyres@gsLineColor = "white" ; color of lines
polyres@gsMarkerColor = "white" ; color of lines
polyres@xyMarker = 16 ; 14 polymarker style
polyres@gsMarkerIndex = 14 ; 14 polymarker style
polyres@gsMarkerSizeF = 0.1 ; polymarker size
plot = gsn_csm_contour_map_ce(wks,sst(:,:,1),res)
do i = 0,2
dot(i)=gsn_add_polymarker(wks,plot,x1(i:i+1),y1(i:i+1),polyres)
dot_line(i)=gsn_add_polyline(wks,plot,x1(i:i+1),y1(i:i+1),plres)
end do
draw(plot)
frame(wks)
###################################################################################
whatever I change y1 and x1 to, it failed to mark TC on the panel.
Thanks for your help!
Jing
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