[ncl-talk] cnConstFEnableFill usage?

[David Brown]

Hi Liz,
I am looking into this now. I will let you know what I find.
 -dave

On Wed, Sep 10, 2014 at 4:09 PM, Elizabeth Burakowski <burakows at ucar.edu>
wrote:

> Hi NCL-Talk,
>
> I am trying to use cnConstFEnableFill to stiple regions in a constant fill
> color/pattern where signal/noise ratios are greater than two.  However, I
> keep getting an error that says:
>
> warning:ContourPlotInitialize: scalar field is constant; no contour lines
> will appear; use cnConstFEnableFill to enable fill
>
> The plotting resources for my contour plot (res) and my signal:noise ratio
> plot (snres) using cnConstFEnableFill is below.  The plot turns out
> perfectly fine, minus the desired stipling.
>
> Is there a specific order I must put cnConstFEnableFill in my script that
> I am missing?  The full script is pretty long, so I've snipped out the bulk
> of it and copied the plot resources information below.  If the full script
> is desired, it is available here:
>
>
> /glade/p/work/burakows/plot/NCL/LC_Diff/biascorr_diff_PD_DF_mult_mean_panel.ncl
>
> Thanks,
>
> Liz.
>
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"
>
> ;==========================================================
> ;                         The main code
> ;==========================================================
>
> begin
>
> <snip>
>
>
> ;----------------------------------------------------------------------
> ; Plotting options section
> ;----------------------------------------------------------------------
>
>  pltType = "ps"                                 ; plot type
>        pltDir = "./"                            ; plot directory
>        pltName = "Panel_biascorr_"+varw+"PD-DF_2011"   ; plot name (ps
> file)
>        pltPath = pltDir+pltName                 ; plot path
>
>    wks = gsn_open_wks(pltType,pltPath)              ; create workstation
> for ps file
>
>         gsn_define_colormap(wks,"temp_diff_18lev")
>
> res = True
>
> res at gsnDraw = False
> res at gsnFrame = False
>
> res at cnFillOn             = True              ; color plot desired
>     res at cnLinesOn            = False             ; turn off contour lines
>     res at cnLineLabelsOn       = False             ; turn off contour labels
>     res at cnInfoLabelOn = False     ; turn off info label (top labels of
> indvid. plots)
> res at cnFillMode           = "RasterFill"      ; turn raster on
> res at cnLevelSelectionMode = "ManualLevels"  ; Set contour levels manually
> res at cnMinLevelValF       = -4                ; minimum contour (degrees
> C, or mm)
>         res at cnMaxLevelValF       = 4                 ; maximum contour
> (degrees C, or mm)
>         res at cnLevelSpacingF      = 0.5               ; contour interval
>
>     res at lbLabelBarOn         = False             ; Will turn on in panel
> later
> res at lbOrientation = "Horizontal"     ; Horizontal label bar
>
>     res at mpFillOn             = False
>     res at mpOutlineOn           = True
>     res at mpOutlineBoundarySets = "AllBoundaries"
>     res at mpProjection          = "CylindricalEquidistant"
>
>     res at mpLimitMode           = "LatLon"           ; required
>     res at mpMinLatF             = minlat-bndadd
>     res at mpMaxLatF             = maxlat+bndadd
>     res at mpMinLonF             = minlon-bndadd
>     res at mpMaxLonF             = maxlon+bndadd
>     res at mpCenterLonF          = (minlon + maxlon)*0.5
>     res at mpCenterLatF          = (minlat + maxlat)*0.5
>  res at gsnLeftString         = ""                ; Turn off left subtitle
>         res at gsnRightString        = ""                ; Turn off right
> subtitle
>     res at gsnMajorLatSpacing    = 2
>     ;res at gsnMajorLonSpacing   = 2
>     res at gsnMinorLonSpacing    = 2
>
> res at gsnAddCyclic = False ; regional grid (changes central meridian)/xwo
>     ;----Resources for stipling of significant signal/noise (>2)
>         snres = True
> snres at gsnDraw = False
> snres at gsnFrame = False
>  snres at lbLabelBarOn = False ; turn off label bar
> snres at cnInfoLabelOn = False ; turn off info label
> snres at cnLineLabelsOn = False ; turn off contour labels
> snres at cnLinesOn = False ; no contour lines
> snres at cnConstFEnableFill= True ; allow constant values (1=sig) to fill
> snres at cnFillOn = True ; turn on fill
> snres at cnMonoFillPattern = True ; single fill pattern
> snres at cnFillColor = "black" ;
> snres at cnFillPattern = 17 ; stipling
> <snip>
>  plot_diff = gsn_csm_contour_map(wks,Wrfdiff_mean,res)
> plot_sn   = gsn_csm_contour(wks,Wrfdiff_sn2,snres)
>  overlay(plot_diff,plot_sn)
>
>
>
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