<div dir="ltr"><div><div><div>Andre,<br></div>It looks like you have the right idea, but I don't see a reason for the commands<br><br></div>'set t 1 2'<br><br></div>That will cause grads to plot two different time steps worth of data. Based on my knowledge of those GFS files, there is only one time slice of data in each file, so depending on what the TDEF line of your control file says, you should get an error on the second time slice. Also, Grads does not overlay plots that vary in time, only plots that are fixed in any two dimensions (X-Y for instance).<br><br>Basically, remove the "set t 1 2' commands and see if the result is what you are looking for.<br><br>Jeff Duda<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Oct 18, 2014 at 2:50 PM, André Petersen <span dir="ltr"><<a href="mailto:mail@andrepetersen.de" target="_blank">mail@andrepetersen.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background:rgb(255,255,255)">Dear
subscriber, <br>
<br>
I downloaded data from the american gfs weather modell (from <a href="ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.2014101812/master" rel="nofollow" style="margin:0px;padding:0px;border:0px;font-size:14px;vertical-align:baseline;color:rgb(74,107,130);text-decoration:none;background:transparent" target="_blank">ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.2014101812/master</a>,
edit date if you read more than 1 month later). <br>
</p>
<p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background:rgb(255,255,255)">I
am using grads to plot data and it works fine if I plot data from
1 timestep (=1 file) on a map. So my first try was to open the
first 2 files and to make a shaded plot showing areas with the
same wind speed in the same color. What I get is an empty plot
with correct axes.</p>
<pre style="margin:0px 0px 10px;padding:5px;border:0px;font-size:14px;vertical-align:baseline;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif;overflow:auto;width:auto;max-height:600px;word-wrap:normal;color:rgb(0,0,0);font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;word-spacing:0px;background:rgb(238,238,238)"><code style="margin:0px;padding:0px;border:0px;font-size:14px;vertical-align:baseline;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif;white-space:inherit;background:rgb(238,238,238)">'open gfs.t12z.mastergrb2f00.ctl'
'open gfs.t12z.mastergrb2f03.ctl'
'set dfile 1'
'set time 12Z17OCT2014'
'set gxout shaded'
'set lat 50'
'set lon 0'
'set lev 1000 200'
'set t 1 2'
'd sqrt(ugrdprs*ugrdprs+vgrdprs*vgrdprs)*1.9438'
'set dfile 2'
'set time 15Z17OCT2014'
'set t 1 2'
'd sqrt(ugrdprs*ugrdprs+vgrdprs*vgrdprs)*1.9438'
</code></pre>
<p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background:rgb(255,255,255)">I
am using opengrads – Grid Analysis and Display System (GrADS)
Version 2.0.2.oga.2.</p>
<p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background:rgb(255,255,255)">Anyone
who can help me plotting data from different timesteps (=
different files) into one plot?<br>
</p>
<p style="margin:0px 0px 1em;padding:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:17.8048000335693px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background:rgb(255,255,255)">Best
regards,<br>
André Petersen<br>
</p>
</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>
</div>