Dear Jing,
In order to use gsn_add_polymarker and gsn_add_polyline, the X/Y
coordinates of the lines and markers
must be in the same coordinate space as the plot you just created. In
your case, your plot is a cylindrical
equidistant map that goes from 0 to 40 latitude, and 100 to 140
longitude, so your X/Y values need to
be in the range 100 to 140 for X, and 0 to 40 for Y.
In your script below, you are using values of x1 = (/32,29,24,21/) for
your X values, and these are well
outside the range 100 to 140, so that's why you are not seeing the
lines or markers.
I'm not sure what your x1/y1 values are supposed to represent, but you
need to translate them to lat/lon
coordinates. If they are already lat/lon values, then you need to
either change the mpMin/MaxLon/LatF
resources so that your map range includes the range of your x1/y1
values, or you need to change your x1/y1 values to
be in the correct range.
--Mary
On Jun 21, 2005, at 9:31 PM, Jing YANG wrote:
> 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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