<div>Hello Steve,</div>
<div>You should be able to use gr2stn to get what you want. First, set x and y to fixed (z and/or t must be fixed), set gxout print, display gr2stn(..., then capture the result. For example, using the GFS ugrdprs and vgrdprs variables and a single timestep:</div>
<div>'set x 1';'set y 1';'set lev 1000'</div>
<div>'set t 5'</div>
<div>'set gxout print' </div>
<div>'set prnopts %0.2f'</div>
<div>'d 1.944*gr2stn(mag(ugrdprs,vgrdprs),-73.27,39.5)';#output in knots</div>
<div>ws=sublin(result,3)</div>
<div>say 'Wnd spd = 'ws<br></div>
<div>Above is for a fixed timestep, but you could increment or vary t (lev) to get multiple time (level) results.</div>
<div> </div>
<div>Good luck--</div>
<div>Stephen McMillan</div>
<div> </div>
<div class="gmail_quote">On Thu, Mar 25, 2010 at 4:55 PM, Steve Levine <span dir="ltr"><<a href="mailto:steve.levine.1523@gmail.com">steve.levine.1523@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Fellow users of GrADS,<br><br>I am plotting gridded binary wind data in GrADS. I can see the contour fields just fine, but I would like to interpolate the grid to find wind speed values at specific points - say a latitude and longitude pair. If you are familiar with GEMPAK, I am looking for something similar to gdpoint that I could use in GrADS. I have tried this with the gr2stn function, but to no avail. Would it be possible to enter in a lat/lon pair, find its grid and simply pull the value from there? If so, how?<br>
<br>Thanks for your help!<br><font color="#888888"><br clear="all">Steve Levine<br>MS Student, Department of Marine & Environmental Systems<br>Florida Institute of Technology<br>150 W University Blvd.<br>Melbourne, FL 32901<br>
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<br></blockquote></div><br>
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