[ncl-talk] Color filled contour disappears with contour_shade pattern

[S Br]

Hi Rick,
Thanks for your reply but my region of interest cover a regional lat/lon
domain, so I can't use gsn_csm_contour(). Instead, I am using
gsn_csm_contour_map().
Actually, my main objective is to draw a correlation plot with contour
filled with color and then mark pattern to the region having significant
correlation value (see the map attached).
For example, I have calculated the threshold value of correlation to be
significant is 0.39. So, I want to draw patterns over the filled contour
for the region having the correlation value below -0.39 and above 0.39.
'gsn_contour_shade' is working fine for this but unfortunately, I can't use
this with gsn_csm_contour_map()

Is there any otherway to achieve this?

Thanks.
SB





On Thu, May 2, 2019 at 4:45 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> The docs for gsn_contour_shade() state:
>
> You cannot mix and match color and shading with this routine. For an
> example of drawing shaded and filled contours, see example coneff_14.ncl
> <http://ncl.ucar.edu/Applications/coneff.shtml#ex14>.
>
> However, that example coneff_14 shows how to achieve the result via two
> calls to gsn_csm_contour():
>
> http://ncl.ucar.edu/Applications/coneff.shtml#ex14
>
> Hope that helps...
> Rick
>
> On Thu, May 2, 2019 at 5:39 AM S Br <sbr.climate at gmail.com> wrote:
>
>> Hi Users,
>> I am trying to plot a contour map filled with color and then apply
>> patterns to the values greater and smaller than the specified values using
>> the function gsn_contour_shade(plot,0.5,3.0,opt)
>>
>> However, when I use the gsn_contour_shade and overlay, the contour filled
>> with color disappears. I can only see the patterns without the filled
>> contour. Please have a look at the attached image.
>>  I am using NCL6.4.0 and my script is given below.
>>
>> Thank you, SB
>>
>> begin
>>
>>  in1 = addfile("precip.gpcp.mon.mean.nc","r")
>>   rain=in1->precip(0,:,:)
>>   printVarSummary(rain)
>> ;************************************
>> ;create plot
>> ;************************************
>>   wks = gsn_open_wks("pdf","overlay")             ; send graphics to PNG
>> file
>>   res                     = True
>>   res at gsnDraw           = False         ; Don't draw plots
>>   res at gsnFrame          = False         ; Don't advance frame
>>   res at cnFillOn          = True          ; Turn on contour fill
>>   res at cnLinesOn         = False         ; Turn off contour lines
>>   res at cnFillPalette       = "MPL_YlOrRd"   ; set color map
>>   res at tiMainString        = "Overlaying shaded contours on filled
>> contours"
>> ;  res at cnFillMode = "RasterFill"
>>   res at cnLevelSelectionMode =  "ManualLevels"
>>   res at cnMinLevelValF       = 0.0
>>   res at cnMaxLevelValF       = 5.0
>>   res at cnLevelSpacingF      = 0.5
>>
>> ;   res at gsnAddCyclic     = False
>>    res at mpMinLatF    =   -10.0               ; only plot 30S to 30N
>>    res at mpMaxLatF    =  54.0
>>    res at mpMinLonF    = 30.0              ; only plot 30S to 30N
>>    res at mpMaxLonF    = 100.0
>>
>>   plot = gsn_csm_contour_map(wks,rain,res)
>>
>>   opt = True
>>   opt at gsnShadeFillType = "pattern"      ; pattern fill
>>   opt at gsnShadeHigh = 2                  ; use pattern #2
>>   opt at gsnShadeLow = 17                  ; use pattern #17
>>   plot2 = gsn_contour_shade(plot,0.5,3.0,opt)
>>   overlay(plot,plot2)
>>
>>   draw(plot)
>>   frame(wks)
>> end
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