If you would like to extract that data, do utilise scripting. It depends on what are your values concept? is a point value as in just one data, or in that point, you want a series values, perhaps temperature from 1000 hPa to 850 hPa at a point, or a time series perhaps. In any case, you can extract what you want from both model and obsservation and compare them in GrADS, maybe do some analysis using GrADS as well. Example of point value.<br>
<br>'sdfopen <a href="http://foo.nc">foo.nc</a>'<br>lonvalue=90<br>latvalue=0<br>levvalue=850<br>tvalue=1<br>'set lon 'lonvalue<br>'set lat 'latvalue<br>'set t 'tvalue<br>'set lev 'levvalue<br>
'd variable1'<br>catch=sublin(result,4)<br>'set gxout fwrite'
<br>'set fwrite point.dat'<br>'d 'catch<br>'disable fwrite'<br><br>This is just a basic one point value extraction. You can expand this based on your needs. You can use loop in setting the lon, lat, lev and t value, that is if your interested location can be used in loops. You can read more on <a href="http://www.iges.org/grads/gadoc/script.html">http://www.iges.org/grads/gadoc/script.html</a> for scripting and <a href="http://www.iges.org/grads/gadoc/aboutgriddeddata.html">http://www.iges.org/grads/gadoc/aboutgriddeddata.html</a> if you wish to extract a more complicated values (series, timeseries, or even fields(though you better off opening both model and observational in GrADS)).<br>
<br>Yunus.<br><br><div class="gmail_quote">On Tue, Mar 26, 2013 at 2:23 AM, Thomas Robinson <span dir="ltr"><<a href="mailto:ter@hawaii.edu" target="_blank">ter@hawaii.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Madak,</div><div><br></div>If you set your latitude and longitude and vertical level to the point you want and display the variable, then you can get the point value. <div><br></div><div>Let's say you want to get precip at 21.2N and 158.8W</div>
<div>set lat 21.2</div><div>set lon -158.8</div><div>set z 1</div><div>d precip</div><div><br></div><div>In the command line, it will display the single point value. </div><div><br></div><div>-Tom<div><div class="h5"><br>
<br><div class="gmail_quote">
On Mon, Mar 25, 2013 at 3:05 AM, Mary Ndlovu <span dir="ltr"><<a href="mailto:maryndlovu@aol.com" target="_blank">maryndlovu@aol.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<font color="black" face="arial">I <font color="black" face="arial">do not think i understand very well. How is your data, montly, daily etc? And what exactly do you want to select, that would make it easier to help if we have the specifications.
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<div style="clear:both">Mary Ndlovu<br>
<a href="mailto:maryndlovu@aol.com" target="_blank">maryndlovu@aol.com</a><br>
</div>
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<div style="font-size:10pt;font-family:arial,helvetica">-----Original Message-----<br>
From: Madak Khan <<a href="mailto:madak76@yahoo.com" target="_blank">madak76@yahoo.com</a>><br>
To: gradsusr <<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
Sent: Sun, Mar 24, 2013 12:16 pm<br>
Subject: [gradsusr] Extract different point values<br>
<br>
<div>
<div style="font-size:12pt;font-family:times new roman,new york,times,serif">
<div>Hi</div>
<div>I have an output (precipitation) from model in NetCDF format. I want to extract the corresponding values of 30 points how can i do that? these 30 points are my selected stations with specific latitude and longitude. I will compare these values (from model output) with observed data. so if any body have script please guide me.</div>
<div>Thank you</div>
<div>FROM:</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">Madak</div>
</div>
</div>
<div style="font-size:12px;font-family:Tahoma,Verdana,Arial,Sans-Serif;margin:0px">
<pre style="font-size:9pt"><tt>_______________________________________________
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<br></blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br>Tom Robinson<br>President - Graduate Student Organization <br>Graduate Student - Department of Meteorology<br>
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