[ncl-talk] add string on each domain

[LI Qi]

Dear Rick,


Really appreciate your help! It works!


Attached is my script to add domain idx. 


But I still have a minor question: when the minimum contour level of terrain height (unit: m) is set to 0, the ocean area shows green. Only when set to 2, the ocean displays correctly (shown below). Why? 
The terrain data is output from WRF model. 


Best regards,
Qi




ncl script:
  xbox = (/lon2(0,0),lon2(0,nx2),lon2(ny2,nx2),lon2(ny2,0),lon2(0,0)/)
  ybox = (/lat2(0,0),lat2(0,nx2),lat2(ny2,nx2),lat2(ny2,0),lat2(0,0)/)
  datatondc(map, xbox, ybox, xbox_out, ybox_out)
  gsn_polyline_ndc(wks, xbox_out, ybox_out, lnres)
; domain 2 idx
  gsn_text_ndc(wks, "d02" , xbox_out(3), ybox_out(3), txres)‍



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------------------ Original ------------------
From:  "Rick Brownrigg";<brownrig at ucar.edu>;
Date:  Thu, Apr 2, 2015 00:47 AM
To:  "LI Qi"<liqi123sh at qq.com>; 
Cc:  "ncl-talk"<ncl-talk at ucar.edu>; 
Subject:  Re: [ncl-talk] add string on each domain



Hi,


There's probably a couple of ways to do this.  gsn_add_text allows you to add and position text in the coordinate space of the data:

http://ncl.ucar.edu/Document/Graphics/Interfaces/gsn_add_text.shtml



In the example script you referenced, you'd want to make this call before the call to "draw(map)" for plot 3.

Alternatively, you can position the text in normalized-device-coordinate space (NDC-space) using gsn_text_ndc():

http://ncl.ucar.edu/Document/Graphics/Interfaces/gsn_text_ndc.shtml


Look in particular at how the nested domain's outline was drawn *on top of* plot3 using NDC coordinates:
; PLOT 3   draw(map)   ; domain 2 already overlaid here - so just draw again   xbox = (/lon2(0,0),lon2(0,nx2),lon2(ny2,nx2),lon2(ny2,0),lon2(0,0)/)   ybox = (/lat2(0,0),lat2(0,nx2),lat2(ny2,nx2),lat2(ny2,0),lat2(0,0)/)   datatondc(map, xbox, ybox, xbox_out, ybox_out)   gsn_polyline_ndc(wks, xbox_out, ybox_out, lnres)

Hope that helps...
Rick





On Tue, Mar 31, 2015 at 8:35 PM, LI Qi <liqi123sh at qq.com> wrote:
Hello NCL community,


I was wondering how to add strings like d01 and d02 in the top-left corner of each domain separately.


The plot of nested domains is shown below.
( http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/EXPERIMENTAL/wrf_overlay_doms.htm )‍


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