<div dir="ltr">Hi Ivica,<div>I am not sure what you have in mind, but if you want to add a single vector and keep all the scaling the same as the original vector field, would it be possible to put your vector(s) in a gridded array?</div><div>If so, I would recommend setting the vcRefLengthF/vcRefMagnitude resources so that the vector sizes are the same, and draw the vector field, and then overlay the single vector.</div><div>For example:</div><div><br></div><div>res = True</div><div>res@gsnDraw = False</div><div>res@gsnFrame = False</div><div>...</div><div>res@vcRefLengthF = 0.05</div><div>res@vcRefMagnitudeF = 0.5</div><div>plot = gsn_csm_vector_map(wks,u,v,res)</div><div><br></div><div>u = u@_FillValue</div><div>v = v@_FillValue</div><div>u({30},{125}) = 0.75</div><div>v({30},{125}) = 0.31</div><div>oplot = gsn_csm_vector(wks,u,v,res) ; Add single vector</div><div><br></div><div>overlay(plot,oplot)</div><div>draw(plot)</div><div>frame(wks)</div><div><br></div><div>Hope that helps!</div><div>Adam</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 3, 2021 at 8:56 PM Ivica Janeković via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear users of NCL,<br>
<br>
I am plotting ROMS model results using standard<br>
gsn_csm_vector_scalar_map and all that is working perfectly. To<br>
compare model results with the observed currents I would like to<br>
overlay vector(s) on the map. Is there any way to add a vector on the<br>
map (and to be scaled as all other vectors from the map)?<br>
<br>
Thanks in advance,<br>
Ivica<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><span><font color="#888888">Adam Phillips <br></font></span></div><span><font color="#888888">Associate Scientist, </font></span><span><font color="#888888">Climate and Global Dynamics Laboratory, NCAR<br></font></span></div></div><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli/" target="_blank">www.cgd.ucar.edu/staff/asphilli/</a> </font></span><span><font color="#888888">303-497-1726 </font></span></div><span><font color="#888888"></font></span><div><div><span><font color="#888888"><br></font></span><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli" target="_blank"></a></font></span></div></div></div></div></div></div></div></div></div></div></div>