Re: Why I can not label zero line in the contour

Hi Wenjun,
Try setting the resource cnLineLabelInterval to 1 . (The default is 2)
http://www.ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnLineLabelInterval

If that does not fix the issue please respond to the ncl-talk email list..
Adam

On 03/27/2014 12:40 PM, Wen-Jun Qu wrote:
>
> Hello, dear NCL friends,
> I am try to draw a contour and label the zero line, but I failed many
> times.
> Would anyone pls help me to find where is the bug?
> I attached the code and also paste it as following.
> Thanks a lot in advance.
> Wenjun
> ******************************************************************************************************
> ;************************************************
> ; Plot less CW winter average boundary layer height0utc6step anomaly
> ;************************************************
> ;************************************************
> ; create plot
> ;************************************************
> wks =
> gsn_open_wks("ps","lesscw_winter_average_boundary_layer_height0utc6step_anomaly")
> ; open a ps file
> gsn_define_colormap(wks,"rainbow")
> res = True ; plot mods desired
> ;res@tiMainString = "Less CW winter average boundary layer
> height0utc6step anomaly (meter) ~C~ (95% significance)"
> res@gsnAddCyclic
> <javascript:_e(%7B%7D,'cvml','res@gsnAddCyclic');> =
> False ; The range of the longitude data is not 360, may
> want to set gsnAddCyclic to False to avoid a warning
> res@cnFillOn
> <javascript:_e(%7B%7D,'cvml','res@cnFillOn');> =
> True ; turn on color fill
> res@cnLinesOn
> <javascript:_e(%7B%7D,'cvml','res@cnLinesOn');> =
> True ; turn on contour lines
> res@cnMonoLineColor
> <javascript:_e(%7B%7D,'cvml','res@cnMonoLineColor');> =
> True ; turn on the drawing of contours lines in one color
> res@cnLineColor
> <javascript:_e(%7B%7D,'cvml','res@cnLineColor');> =
> "white" ; set the contour line color as "white"
> res@gsnContourNegLineDashPattern
> <javascript:_e(%7B%7D,'cvml','res@gsnContourNegLineDashPattern');> =
> 2 ; set the contour line pattern as "dash"
> res@gsnContourPosLineDashPattern
> <javascript:_e(%7B%7D,'cvml','res@gsnContourPosLineDashPattern');> =
> 11 ; set the contour line pattern as "dash"
> res@gsnContourLineThicknessesScale
> <javascript:_e(%7B%7D,'cvml','res@gsnContourLineThicknessesScale');> =
> 1.8 ; set the contour lines thickness
> res@gsnContourZeroLineThicknessF
> <javascript:_e(%7B%7D,'cvml','res@gsnContourZeroLineThicknessF');> =
> 1.8 ; set the zero contour line thickness
> res@cnInfoLabelOn
> <javascript:_e(%7B%7D,'cvml','res@cnInfoLabelOn');> =
> True ; turn on coutour information label
> res@gsnSpreadColors
> <javascript:_e(%7B%7D,'cvml','res@gsnSpreadColors');> = True
> res@gsnSpreadColorStart
> <javascript:_e(%7B%7D,'cvml','res@gsnSpreadColorStart');> = 2
> res@gsnSpreadColorEnd
> <javascript:_e(%7B%7D,'cvml','res@gsnSpreadColorEnd');> = 255
> res@lbOrientation
> <javascript:_e(%7B%7D,'cvml','res@lbOrientation');> =
> "vertical" ; vertical label bars
> res@cnFillDrawOrder
> <javascript:_e(%7B%7D,'cvml','res@cnFillDrawOrder');> = "Predraw"
> res@cnLineDrawOrder
> <javascript:_e(%7B%7D,'cvml','res@cnLineDrawOrder');> = "Predraw"
> res@cnLevelSelectionMode
> <javascript:_e(%7B%7D,'cvml','res@cnLevelSelectionMode');> =
> "ExplicitLevels" ; set explicit contour levels
> res@cnLevels
> <javascript:_e(%7B%7D,'cvml','res@cnLevels');> =
> (/-200,-150,-125,-100,-80,-60,-40,-20,0,20,40,60,80,100,125,150,200/)
> res@cnLineLabelPlacementMode
> <javascript:_e(%7B%7D,'cvml','res@cnLineLabelPlacementMode');> =
> "computed" ; define the contour Line Label Placement Mode
> levels =
> (/-200,-150,-125,-100,-80,-60,-40,-20,0,20,40,60,80,100,125,150,200/)
> nlev = dimsizes(levels)
> ;--------------------------------------------------
> ;set only to label the zero and positive labels
> res@cnLevelSelectionMode
> <javascript:_e(%7B%7D,'cvml','res@cnLevelSelectionMode');> =
> "ExplicitLevels"
> res@cnLevels <javascript:_e(%7B%7D,'cvml','res@cnLevels');> = levels
> ; Control which contour lines get drawn.
> res@cnLevelFlags
> <javascript:_e(%7B%7D,'cvml','res@cnLevelFlags');> =
> (/"NoLine","NoLine","NoLine","NoLine",
> "NoLine","NoLine","NoLine","NoLine","LineAndLabel","NoLine","NoLine","NoLine",
> \
> "NoLine","NoLine","NoLine","NoLine","NoLine"/)
> lbstrings = new(nlev, "string")
> ;lbstrings = ""
> lbstrings = where(levels .eq. 0, "0", 0)
> print(lbstrings)
> ;lbstrings = where(levels .eq. 0.02, "0.02", lbstrings)
> ;lbstrings = where(levels .eq. 0.04, "0.04", lbstrings)
> ;lbstrings = where(levels .eq. 0.06, "0.06", lbstrings)
> res@cnExplicitLineLabelsOn
> <javascript:_e(%7B%7D,'cvml','res@cnExplicitLineLabelsOn');> = True
> res@cnLineLabelStrings
> <javascript:_e(%7B%7D,'cvml','res@cnLineLabelStrings');> = lbstrings
> ;--------------------------------------------------
> res@mpFillOn
> <javascript:_e(%7B%7D,'cvml','res@mpFillOn');> =
> True ; turn on gray continents
> ;res@mpCenterLonF = 180 ; Centers the plot at 180
> res@mpLimitMode
> <javascript:_e(%7B%7D,'cvml','res@mpLimitMode');> = "LatLon"
> ;res@mpMinLonF = 72.
> ;res@mpMaxLonF = 136.
> ;res@mpMinLatF = 17.
> ;res@mpMaxLatF = 55.
> res@mpMinLonF
> <javascript:_e(%7B%7D,'cvml','res@mpMinLonF');> = 70.
> res@mpMaxLonF
> <javascript:_e(%7B%7D,'cvml','res@mpMaxLonF');> = 140.
> res@mpMinLatF
> <javascript:_e(%7B%7D,'cvml','res@mpMinLatF');> = 15.
> res@mpMaxLatF
> <javascript:_e(%7B%7D,'cvml','res@mpMaxLatF');> = 55.
>
> ;fill_specs = (/"water","land"/)
> ;res@mpFillBoundarySets = "NoBoundaries"
> ;res@mpFillAreaSpecifiers = fill_specs
> ;res@mpSpecifiedFillColors = (/"gray","gray"/)
> res@mpAreaMaskingOn
> <javascript:_e(%7B%7D,'cvml','res@mpAreaMaskingOn');> = 1
> res@mpMaskAreaSpecifiers
> <javascript:_e(%7B%7D,'cvml','res@mpMaskAreaSpecifiers');> =
> (/"China","Taiwan"/)
> ;
> ; Set up some map resources.
> ;
> ;nc1 = NhlNewColor(wks,.7,.7,.7) ; Add light gray to colormap,
> ; for continents.
> res = True
> res@gsnMaximize <javascript:_e(%7B%7D,'cvml','res@gsnMaximize');> =
> True ; Maximize plot in frame.
> res@gsnFrame <javascript:_e(%7B%7D,'cvml','res@gsnFrame');> =
> False ; Don't advance the frame
> res@mpDataSetName
> <javascript:_e(%7B%7D,'cvml','res@mpDataSetName');> =
> "Earth..4" ; This new database contains
> ; divisions for other
> countries.
> res@mpDataBaseVersion
> <javascript:_e(%7B%7D,'cvml','res@mpDataBaseVersion');> =
> "MediumRes" ; Medium resolution database
> res@mpOutlineOn
> <javascript:_e(%7B%7D,'cvml','res@mpOutlineOn');> = True ;
> Turn on map outlines
> res@mpOutlineSpecifiers
> <javascript:_e(%7B%7D,'cvml','res@mpOutlineSpecifiers');> =
> (/"China:states","Taiwan"/) ;China:states
> res@mpGeophysicalLineThicknessF
> <javascript:_e(%7B%7D,'cvml','res@mpGeophysicalLineThicknessF');>= 2.
> ; double the thickness of geophysical boundaries
> res@mpNationalLineThicknessF
> <javascript:_e(%7B%7D,'cvml','res@mpNationalLineThicknessF');>= 2. ;
> double the thickness of national boundaries
> ;
> ; Zoom in on P. R. China.
> ;
> res@mpMinLatF <javascript:_e(%7B%7D,'cvml','res@mpMinLatF');> = 17.
> res@mpMaxLatF <javascript:_e(%7B%7D,'cvml','res@mpMaxLatF');> = 55.
> res@mpMinLonF <javascript:_e(%7B%7D,'cvml','res@mpMinLonF');> = 72.
> res@mpMaxLonF <javascript:_e(%7B%7D,'cvml','res@mpMaxLonF');> = 136.
> ;res@mpFillColors = (/-1,-1,nc1,-1/) ;assign light gray to land
> masses
> res@mpFillColors <javascript:_e(%7B%7D,'cvml','res@mpFillColors');> =
> (/"transparent","transparent","transparent","transparent"/) ;fill land
> and ocean in transparent
> res@cnInfoLabelOn <javascript:_e(%7B%7D,'cvml','res@cnInfoLabelOn');>
> = False ;Don't draw an informational label
> plot =
> gsn_csm_contour_map_ce(wks,blh0utc6step_ave_lesscwyear_anomaly(:,:),
> res) ; create plot
> ******************************************************************************************************
> ------------------------------------------------------------------------
> Wen.J.Qu
> 2014-03-27
>
>
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

-- 
______________________________________________________________
Adam Phillips                                asphilli@ucar.edu
NCAR/Climate and Global Dynamics Division       (303) 497-1726
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/staff/asphilli

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Thu Mar 27 13:01:17 2014