Re: Duplicate contour line labels with overlay shading

Hi Arlene,
According to the documentation, the gsn_contour_shade function only
accepts a limited set of resources:
http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_contour_shade.shtml
All other resources that are set beyond the possible 4 listed in the
documentation are ignored.

All that being said, gsn_contour_shade simply modifies/sets some of the
following resources after a plot is drawn:
cnFillOn, cnMonoFillPattern, cnMonoFillColor, cnFillColors, and
cnFillPatterns. In other words, it doesn't change the behavior of the
line labels generated in the original plot. If you had line labels in
the original plot, gsn_contour_shade will not modify them. (The opposite
is true as well.)

I wonder if you see the same duplicate line labels when omitting the
calling of gsn_contour_shade, as you are doing multiple overlays.

If I'm off base here, include a .gif/.png/ or .jpg of the plot in your
reply to ncl-talk..
Adam

Arlene Laing wrote:
> Good day,
>
> I am getting duplicate contour line labels after overlaying a
> stippling pattern for contours above a certain value of equivalent
> potential temperature (eth).
>
> As you can see from the excerpted script below, I reset the resource
> (res_eth) contour line and contour line label to "False" before
> calling "gsn_contour_shade". However, that does not stop the
> duplication.
>
> Your help with solving this problem will be greatly appreciated.
>
> Thanks.
> Arlene Laing
> NCAR/MMM
>
> ;***********************************************
> ; set plot resources
> res_at_vpWidthF = .9 ; overwrite basic plot size
> res_at_vpHeightF = 1.0
> pltres = True
>
> res_xy = res
> res_xy_at_tiYAxisString = "Pressure (hPa)"
> res_xy_at_AspectRatio = 0.75
> res_xy_at_cnMissingValPerimOn = True
> res_xy_at_cnMissingValFillColor = 0
> res_xy_at_cnMissingValFillPattern = 11
> res_xy_at_sfYCStartV = max(pressure_levels)
> res_xy_at_sfYCEndV = min(pressure_levels)
> res_xy_at_trYReverse = True ; reverse Y axis
> res_xy_at_trYLog = True ; Log scale
> res_xy_at_tmYLMode = "Explicit"
> res_xy_at_tmYLValues = (/1000., 850., 700., 600., 500., 400., \
> 300., 250., 200./)
> res_xy_at_tmYLLabels = (/"1000","850","700","600","500","400", \
> "300","250","200"/)
> ; res_xy_at_sfYArray = pressure_levels
> res_xy_at_tiXAxisFontHeightF = 0.02
> res_xy_at_tiYAxisFontHeightF = 0.02
> res_xy_at_tmXBMajorLengthF = 0.02
> res_xy_at_tmYLMajorLengthF = 0.02
> res_xy_at_tmYLLabelFontHeightF = 0.015
> res_xytxFontHeightF = 0.015
> res_xy_at_tiXAxisString = "Latitude"
> res_xy_at_sfXArray = lat2d(:,0)
>
> res_xy_at_gsnDraw = False ; Don't draw plots
> res_xy_at_gsnFrame = False ; Don't advance frame
>
> ; Plotting options for U
> res_u = res_xy
> ; res_u_at_cnInfoLabelOrthogonalPosF = 0.00
> res_u_at_cnInfoLabelOn = False ; turn off cn info label
> res_u_at_cnLineLabelPerimOn = False ; turn off label perimeter
> res_u_at_cnLabelMasking = True ; do not draw labels over contour
> res_u_at_cnLineLabelFontHeightF = 0.016
> res_u_at_cnLineLabelBackgroundColor = "white"
> res_u_at_cnLineThicknessF = 1.5
> res_u_at_ContourParameters = (/ -30., 20, 2. /)
> res_u_at_gsnContourNegLineDashPattern = 1
>
> ; Plotting options for RH
> res_rh = res_xy
> res_rh_at_pmLabelBarOrthogonalPosF = -0.07
> res_rh_at_ContourParameters = (/ 10., 90., 10. /)
> res_at_cnFillMode = "RasterFill" ; Raster Mode
> res_at_cnLinesOn = False ; Turn off contour lines
> res_at_cnLineLabelsOn = False ; Turn off contour lines
> res_rh_at_cnFillOn = True
> res_rh_at_cnFillColors = (/"White", "White","White",\
> "White","DarkOliveGreen1","Chartreuse","Green",
> \
> "Green3", \
> "ForestGreen","PaleGreen4"/)
>
> ; Plotting options for ETH, Equivalent Pot Temperature
> res_eth = res_xy
> res_eth_at_cnInfoLabelOrthogonalPosF = 0.00
> res_eth_at_cnLineColor = "Blue"
> res_eth_at_cnLineThicknessF = 1.0
> res_eth_at_cnLineLabelFontHeightF = 0.020
> res_eth_at_cnLabelMasking = True ; do not draw labels over
> contour
> res_eth_at_ContourParameters = (/ 320., 376., 2. /)
>
> ; Get the contour info (from WRF NCL example)
> contour_u = wrf_contour(a,wks,zave_u,res_u)
> contour_rh = wrf_contour(a,wks,zave_rh,res_rh)
> contour_eth = wrf_contour(a,wks,zave_eth,res_eth)
>
> ; MAKE PLOTS
> pltres_at_FramePlot = False ; do not frame plot - will do this
> later
>
> plot =
> wrf_overlays(a,wks,(/contour_eth,contour_u,contour_rh/),pltres)
>
> res_at_gsnRightString = ""
> res_at_gsnLeftString = ""
> res_at_gsnCenterString = ""
>
> ; testing shaded contour for eth > 343K
> res_eth_at_cnLinesOn = False ; Turn off contour lines
> res_eth_at_cnLineLabelsOn = False ; Turn off contour labels
> res_eth_at_cnMonoFillColor = True ; default color is fground
> [black]
> res_eth_at_cnMonoFillPattern = False ; want multiple patterns
> res_eth_at_cnMonoFillScale = False ; want patterns w/ diff
> densities
> res_eth_at_gsnShadeFillType = "Pattern"
> res_eth_at_gsnShadeHigh = 17 ; Use fill pattern #17 (stipple)
>
> ; plot=gsn_contour(wks,zave_eth,res_eth) ; plot zonal ave of eth
> plot = gsn_contour_shade(plot,-999.,343., res_eth) ; Pattern
> shade contours above 343
>
> draw(plot)
> frame(wks)
>
> ;***********************************************
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-- 
--------------------------------------------------------------
Adam Phillips			             asphilli_at_ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000	  http://www.cgd.ucar.edu/cas/asphilli
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