[ncl-talk] Overlay a box and a marker over WRF field

[Alex Schaefer]

Rabah,

Where in your script did you add the resources suggested by Jared?

Since you have a bunch of different resource objects you will need to set it in each going into plots controlling plot resources. For you this should include res or opts and likely pltres.

-Alex


On May 26, 2015, at 6:36 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca> wrote:

> Hi Jared,
> 
> Thanks for your reponse,
> 
> But add  
> 
> 
> res at gsnDraw = False
> res at gsnFrame = False
> 
> doesn't change any things. 
> 
> Rabah
> 
> 
> 2015-05-26 18:34 GMT-04:00 Jared Lee <jaredlee at ucar.edu>:
> Hi Rabah,
> 
> I believe what you're missing is these two lines where you set other 'res' resources:
> 
> res at gsnDraw = False
> res at gsnFrame = False
> 
> By default they're both set to True, which would give you two separate images. If you set both to false you should get a single plot with your polymarker overlaid.
> 
> Hope that helps.
> 
> Jared
> 
> On Tue, May 26, 2015 at 4:21 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca> wrote:
> 
> 
> Hello NCL users,
> 
> I am using the script below to plot a box and a marker dot over topography field from WRF outputs,
> 
> My problem is i can not get one figure, i get two separate figures like attached. 
> 
> Any suggestion to solve this.
> 
> 
> 
> 
> 
> ;   Example script - plot terrain (using some basic WRF scripts)
> ;   Overwrite basic map background settings
> ;   November 2008
> 
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
> 
> begin
> 
>   a = addfile("../geo_em.d02.nc","r")           ; Open a file
>   filename = "../namelist.wps"
> 
>   npres= True
>   npres at ref_lat   = stringtofloat(systemfunc("grep ref_lat    " +filename+ " | cut -f2 -d'=' | cut -f1 -d','" ) )
>   npres at ref_lon   = stringtofloat(systemfunc("grep ref_lon    " +filename+ " | cut -f2 -d'=' | cut -f1 -d','" ) )
> 
>  type = "png"
>   wks = gsn_open_wks(type,"plt_geo_6")         ; Create a plot workstation
> 
> 
>   opts = True                                  ; Set some Basic Plot options
>   opts at MainTitle = "GEOGRID FIELDS"
>   opts at InitTime = False                        ; Do not plot time or footers
>   opts at Footer = False    
> 
>   ter = wrf_user_getvar(a,"HGT_M",0)           ; Read the variable to memory
>   lon = a->XLONG_U(0,:,:)
>   lat = a->XLAT_U(0,:,:)
>  printVarSummary(lat) 
>  
>  print (lat(0,0)+", "+lon(0,0)+",0,")
>  print (lat(0,60)+", "+lon(0,60)+",0,")
>  print (lat(59,60)+", "+lon(59,60)+",0,")
>  print (lat(59,0)+", "+lon(59,0)+",0")
>  
>  
>   res = opts                                   ; Use basic options for this field
>   res at cnFillOn = True                          ; Create a color fill plot
>   res at ContourParameters = (/ 0., 1000., 50. /) ; Set the levels
> 
>   contour = wrf_contour(a,wks,ter,res)
> 
>   pltres = True                                ; Set plot options
>   mpres = True                                 ; Set map options
>   mpres at mpGeophysicalLineColor      = "Black"  ; Overwrite basic map settings
>   mpres at mpGridLineColor             = "Black"
>   mpres at mpLimbLineColor             = "Black"
>   mpres at mpNationalLineColor         = "Black"
>   mpres at mpPerimLineColor            = "Black"
>   mpres at mpUSStateLineColor          = "Black"
>      mpres at mpProjection = "LambertConformal"
>        mpres at mpLambertParallel1F = 30
>        mpres at mpLambertParallel2F = 60 
>        mpres at mpLambertMeridianF = -98
>        mpres at mpGridSpacingF     = 0.25
> ;************************************************
> ; add the box
> ;************************************************
> ;************************************************
>  ypts = (/ lat(10,10), lat(10,50), lat(49,50),  lat(49,10),  lat(10,10)/)
>  xpts = (/ lon(10,10), lon(10,50), lon(49,50),  lon(49,10),  lon(10,10)/)
> ;************************************************
> 
>   resp                  = True                      ; polyline mods desired
>   resp at gsLineColor      = "black"                     ; color of lines
>   resp at gsLineThicknessF = 2.0                       ; thickness of lines
> ;  resp at gsLineLabelString= "test"                    ; adds a line label string
>    
> 
>        
>   plot = wrf_map_overlays(a,wks,(/contour/),pltres,mpres) ; Plot field over map background
>   
>   
>   dum = new(4,graphic) 
>   do i = 0 , 3
>     dum(i)=gsn_add_polyline(wks,plot,xpts(i:i+1),ypts(i:i+1),resp)      
>   end do 
> ;********************************************************* 
>   mpres at gsMarkerColor = "Black"
>   mpres at gsMarkerIndex = 16
>   mpres at gsMarkerSizeF = 0.005
>   gsn_polymarker(wks,plot,npres at ref_lon,npres at ref_lat,mpres)
>    
>   draw(plot)
>   frame(wks)
>  
> end
> 
> -- 
> ------------------------------
> Cordialement,
> Best regards,
> Rabah Hachelaf 
> 
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> 
> 
> 
> -- 
> ===============================
> Jared A. Lee, Ph.D.
> Project Scientist I
> Research Applications Laboratory
> National Center for Atmospheric Research
> Boulder, Colorado, USA
> 
> Email: jaredlee at ucar.edu (w)
> Phone: 303.497.8485 (w)
> Web: https://staff.ucar.edu/users/jaredlee
> ===============================
> 
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> 
> 
> 
> -- 
> ------------------------------
> Cordialement,
> Best regards,
> Rabah Hachelaf 
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