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

Tue May 26 21:51:20 MDT 2015

Rabah,

So if you don’t put them both both res and pltres you still end up with 2 plots?

It might also be worth trying to use the gsn_add_polymarker as opposed to using the gsn-polymarker. gsn_polymarker might have the frame internally built. The gsn_add_polymarker does return an identifier so you would do it similar to your polyline call:

pm_id = gsn_add_polymarker(wks,plot,npres at ref_lon,npres at ref_lat,mpres)

If this doesn’t work can you attach your geo_em file and script and I will see if I can see what is going on.

-Alex

On May 26, 2015, at 7:06 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca> wrote:

> Hi Alex ,
> 
> When i add 
>  opts at gsnDraw = False
>  opts at gsnFrame = False   
>  or 
>  res at gsnDraw = False
>  res at gsnFrame = False   
> 
> and also 
> 
>  pltres at gsnDraw = False
>  pltres at gsnFrame = False 
> 
> I get only grid with the box and the marker like attached. 
> 
> 
> 
> 2015-05-26 20:47 GMT-04:00 Alex Schaefer <alexander.schaefer at mines.sdsmt.edu>:
> 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 
>> _______________________________________________
>> ncl-talk mailing list
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> 
> 
> 
> 
> -- 
> ------------------------------
> Cordialement,
> Best regards,
> Rabah Hachelaf 
> <plt_geo_6.png>

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