<div dir="ltr"><div class="gmail_default" style="font-size:small">Barry,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">In order to plot data over a map, you have to provide lat/lon information. That's what the error is telling you.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Your script has a data variable called t2m_ave, and it doesn't have any lat/lon coordinates associated with it. You did name the two dimensions "lat" and "lon", but that's not enough. You additionally need to do this:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">
<p class="gmail-p1"><span class="gmail-s1"> t2m_ave!0=</span><span class="gmail-s2">"lat"<br></span><span class="gmail-s1"> t2m_ave!1=</span><span class="gmail-s2">"lon"<br></span> t2m_ave&lat = lat_0<br> t2m_ave&lon = lon_0</p></div><div class="gmail_default" style="font-size:small"><div class="gmail_default">Here's another way you can get the lat/lon coordinates attached t2m_ave:</div><div class="gmail_default"><br></div></div><div class="gmail_default" style="font-size:small">When you do an arithmetic calculation like this:</div><div class="gmail_default" style="font-size:small">
<p class="gmail-p1"><span class="gmail-s1"> t2m_ave = t2m/n_dirWRF</span></p><p class="gmail-p1">NCL does not copy any metadata from the right-hand variables, except for the _FillValue attribute.</p><p class="gmail-p1">To preserve the metadata, you can do this little trick:</p><p class="gmail-p1"> t2m_ave = t2m ; This makes an identical copy of t2m<br> t2m_ave = t2m/n_dirWRF </p><p class="gmail-p1"> printVarSumary(t2m_ave)</p><p class="gmail-p1">The printVarSummary will verify whether any metadata got copied.</p><p class="gmail-p1">--Mary</p><p class="gmail-p1"><br></p></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 29, 2016 at 9:24 AM, Barry Lynn <span dir="ltr"><<a href="mailto:barry.h.lynn@gmail.com" target="_blank">barry.h.lynn@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi:<div><br></div><div>I have used the helpful suggestions offered through ncl-talk to create</div><div>the attached program that reads multiple GEFS files from multiple GEFS directories (on your disk).</div><div><br></div><div>Of course, any one on the list can use this program, but I would like to upload it again after I solve this problem.</div><div><br></div><div>As part of my calculations for the GEFS mean, I need to create a variable called t2m_ave. However, when I use it I get get the error below.</div><div><br></div><div>If I use a variable from the GEFS*grb files that I don't need in place of it, I can make very nice plots of the mean surface temperature. This means that these variables already have grid information attached to them.</div><div><br></div><div>The page: <a href="http://www.ncl.ucar.edu/Document/Graphics/error_msg.shtml" target="_blank">http://www.ncl.ucar.edu/<wbr>Document/Graphics/error_msg.<wbr>shtml</a></div><div><br></div><div>has a suggestion what to do, but I am not sure what "x" is, and how to use the suggestion.</div><div><br></div><div>The upshot is that I need to attach geographical information to my "average variables," and I don't know how to do this.</div><div><br></div><div><div>check_for_y_lat_coord: Warning: Data either does not contain a valid latitude coordinate array or doesn't contain one at all.</div><div>(0)<span class="m_2240431233484496555gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>A valid latitude coordinate array should have a 'units' attribute equal to one of the following values: </div><div>(0)<span class="m_2240431233484496555gmail-Apple-tab-span" style="white-space:pre-wrap"> </span> 'degrees_north' 'degrees-north' 'degree_north' 'degrees north' 'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'</div><div>(0)<span class="m_2240431233484496555gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>check_for_lon_coord: Warning: Data either does not contain a valid longitude coordinate array or doesn't contain one at all.</div><div>(0)<span class="m_2240431233484496555gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>A valid longitude coordinate array should have a 'units' attribute equal to one of the following values: </div><div>(0)<span class="m_2240431233484496555gmail-Apple-tab-span" style="white-space:pre-wrap"> </span> 'degrees_east' 'degrees-east' 'degree_east' 'degrees east' 'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg eas</div>-- <br><div class="m_2240431233484496555gmail_signature"><div dir="ltr">Barry H. Lynn, Ph.D<div><div>Senior Lecturer,</div><div><div><span style="color:rgb(136,136,136)">The Institute of the Earth Science, </span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">The Hebrew University of Jerusalem, </span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">Givat Ram, Jerusalem 91904, Israel </span><br style="color:rgb(136,136,136)"></div><span style="color:rgb(136,136,136)">Tel: 972 547 231 170</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">Fax: (972)-25662581</span></div></div><div><span style="color:rgb(136,136,136)"><br></span></div><div>C.E.O, Weather It Is, LTD<br>Weather and Climate Focus<br><a href="http://weather-it-is.com" target="_blank">http://weather-it-is.com</a><br>Jerusalem, Israel<br>Local: 02 930 9525<br>Cell: 054 7 231 170<br>Int-IS: x972 2 930 9525<br>US <a href="tel:914%20432%203108" value="+19144323108" target="_blank">914 432 3108</a><br></div></div></div>
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