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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Alex,<br>
I'll take a look. Thanks for your time and for sharing this.<br>
best regards,<br>
Matt<br>
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<div style="direction: ltr;" id="divRpF416702"><font color="#000000" face="Tahoma" size="2"><b>From:</b> Alexander Schaefer [alexander.schaefer@mines.sdsmt.edu]<br>
<b>Sent:</b> Monday, March 23, 2015 12:01 PM<br>
<b>To:</b> Matthew Fearon<br>
<b>Cc:</b> ncl-talk@ucar.edu<br>
<b>Subject:</b> Re: [ncl-talk] diagonal cross section with wrf_user_intrp3d<br>
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<div>Matt,<br>
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Attached is a cross-section script I use. It goes rather in-depth. This one simply loops over the index values from point A to point B, which would be at a 45 deg angle. To get different angled cross-sections you would have to create an array of all the points
between the points on the line you want. It may be easier to use the point/angle method and just control the range of the data plotted.<br>
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Best of luck,<br>
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-Alex<br>
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<div class="gmail_quote">On Mon, Mar 23, 2015 at 12:01 PM, Matthew Fearon <span dir="ltr">
<<a href="mailto:Matthew.Fearon@dri.edu" target="_blank">Matthew.Fearon@dri.edu</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Alex,<br>
Yes. As you have time, please send your script. Would be good see an alternative.
<br>
thank you,<br>
Matt<br>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> Alexander Schaefer [<a href="mailto:alexander.schaefer@mines.sdsmt.edu" target="_blank">alexander.schaefer@mines.sdsmt.edu</a>]<br>
<b>Sent:</b> Monday, March 23, 2015 10:52 AM<br>
<b>To:</b> Matthew Fearon<br>
<b>Cc:</b> Evelyn Grell - NOAA Affiliate; <a href="mailto:ncl-talk@ucar.edu" target="_blank">
ncl-talk@ucar.edu</a>; <a href="mailto:wrf-help@ucar.edu" target="_blank">wrf-help@ucar.edu</a>
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<b>Subject:</b> Re: [ncl-talk] diagonal cross section with wrf_user_intrp3d<br>
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<div>Hi Matt,<br>
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I haven't been able to get the diagonal slicing with wrf_user_intrp3d to work right but I have been able to get diagonal cross-sections, though it was not pretty. Essentially created some arrays of the points that were in the cross-section and then used wrf_interp_1d
to interpolate the data at each point in the list to higher resolution in the vertical. Works best with points on the 45 deg angle to reduce horizontal space between points but I suppose that any array of points should work. I played with the "2-point" example
for multiple days before going other routes. This way does however let you control the horizontal extent like you were looking to do.<br>
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<div>I'll search for the script and pass it along if you would like to give it a whirl.<br>
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<div>-Alex<br>
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<div class="gmail_quote">On Mon, Mar 23, 2015 at 11:40 AM, Matthew Fearon <span dir="ltr">
<<a href="mailto:Matthew.Fearon@dri.edu" target="_blank">Matthew.Fearon@dri.edu</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hi Evelyn,<br>
Thank you for your help. I was able to get a diagonal slice using the single pivot point (and angle) example. Still no luck with the two point example. The latter would be better as I could limit the horizontal extent more easily. I'll try again later.
<br>
thanks again,<br>
Matt<br>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> Evelyn Grell - NOAA Affiliate [<a href="mailto:evelyn.grell@noaa.gov" target="_blank">evelyn.grell@noaa.gov</a>]<br>
<b>Sent:</b> Monday, March 23, 2015 8:12 AM<br>
<b>To:</b> Matthew Fearon<br>
<b>Cc:</b> <a href="mailto:wrf-help@ucar.edu" target="_blank">wrf-help@ucar.edu</a>;
<a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a><br>
<b>Subject:</b> Re: [ncl-talk] diagonal cross section with wrf_user_intrp3d<br>
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Matthew,</div>
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Regarding your second question (the easier one), I got confused by this too. I believe the order of the variables got changed between versions:</div>
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<div class="gmail_default" style="font-size:12.8000001907349px">In v6.1.2, the order to specify 2 points for a cross section has to be x1,x2,y1,y2.</div>
<div class="gmail_default" style="font-size:12.8000001907349px">In v6.2.1, the order to specify 2 points has to be x1,y1,x2,y2.</div>
<div class="gmail_default" style="font-size:12.8000001907349px">(maybe wrfhelp could add a note in the example.)</div>
<div class="gmail_default" style="font-size:12.8000001907349px"><br>
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<div class="gmail_default" style="font-size:12.8000001907349px">You can check by looking at the code in your</div>
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<div class="gmail_default"><font face="tahoma, sans-serif"><span style="font-size:12.8000001907349px">$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl</span></font><br>
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<div class="gmail_default"><font face="tahoma, sans-serif"><span style="font-size:12.8000001907349px">Another thing that I ran into is that it assumes you are defining your points in "WRF" space (ie arrays start with 1) rather than in "NCL" space (ie arrays
start with 0) so it subtracts 1 for you...</span></font></div>
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<span style="font-size:12.8000001907349px">In wrf_user_interp3d:</span><br>
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<pre><font color="#0000ff">; set vertical cross section
if (opts) then
xy = wrf_user_set_xy( z, loc_param(0)-1, loc_param(2)-1, \ ; the -1 is for NCL dimensions
loc_param(1)-1, loc_param(3)-1, \
angle, opts )</font><font face="tahoma, sans-serif">
</font></pre>
<div style="font-family:tahoma,sans-serif">(loc_param is the variable containing your XS endpoints).</div>
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<div style="font-family:tahoma,sans-serif">About your first question, maybe you are missing the 2d interpolation that defines the x-axis?</div>
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something like:</div>
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if (xang.gt.20. .and. xang.lt.340) then</div>
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X_plane = wrf_user_intrp2d(lon,xspts,0.,True)</div>
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else</div>
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X_plane = wrf_user_intrp2d(lat,xspts,0.,True)</div>
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end if</div>
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dimsX = dimsizes(X_plane)</div>
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xspan = dimsX(0)-1</div>
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<div><font face="tahoma, sans-serif"><span style="font-size:12.8000001907349px"> res@tmXBValues = fspan(0,xspan,2) </span></font><br>
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<div style="font-family:tahoma,sans-serif; font-size:12.8000001907349px">Hope that helps,</div>
<div style="font-family:tahoma,sans-serif; font-size:12.8000001907349px">Evelyn Grell</div>
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<div class="gmail_quote">On Mon, Mar 23, 2015 at 12:21 AM, Matthew Fearon <span dir="ltr">
<<a href="mailto:Matthew.Fearon@dri.edu" target="_blank">Matthew.Fearon@dri.edu</a>></span> wrote:<br>
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<pre>Dear WRF-help and NCL users,<br><br>Has anyone successfully plotted a cross section with wrf data <br>along a diagonal, say southeast to northwest or vice versa, using <br>wrf_user_intrp3d? North/south or east/west works fine, but from the <br>documentation, a diagonal seemed possible using the example below<b>, <br></b>although I can't get it working<b>? <br><br></b>Also, the plane is defined (/xstart,xend , ystart,yend/) for sure<br>rather than (/xstart,ystart , xend,yend/) instead?<b><br><br></b>thanks,<br>Matt<b><br><br></b><br><br><br>load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"<b>
a = <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml" target="_blank"><strong>addfile</strong></a></b>("wrfout_d01_2000-01-24_12:00:<a href="http://00.nc" target="_blank">00.nc</a>","r")
time = 1
tc = <a href="https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml" target="_blank"><strong>wrf_user_getvar</strong></a>(a,"tc",time) ; T [C]
z = <a href="https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml" target="_blank"><strong>wrf_user_getvar</strong></a>(a,"z",time) ; z on mass points
plane = (/ 40,81 , 259,81 /) ; approx. START x;y and END x;y point
; Extract cross section from point A to point B, as defined in "plane"
; And vertically interpolate to height coordinates ("z")
tc_plane = <strong>wrf_user_intrp3d</strong>(tc,z,"v",plane,0.,True)</pre>
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