Many thanks Jeff and Yaqiang,<div><br><div>first i followed the steps suggested by Jeff, I created the .ctl and .idx and launched GrADS. I opened the file.ctl and displayed the TMP2m variable, and GrADS issued an error: </div>
<div><br></div><div>Cannot contour grid - all undefined values. </div><div><br></div><div>If I then set the variables to one grid point and time, the TMP2m displayed an odd value: </div><div><div><br></div><div>ga-> d tmpsfc</div>
<div>Result value = -9.99e+08 </div></div><div><br></div><div>Is there any problem with my files? I attach the .ctl below</div><div><br></div><div>Many thanks in advance!</div><div><br></div><div>Miquel</div><div><br></div>
<div><br></div><div><div>dset ^gfs.t06z.mastergrb2f%f2</div><div>options template</div><div>index ^gfs.t06z.mastergrb2f03.idx</div><div>undef 9.999E+20</div><div>title gfs.t06z.mastergrb2f03</div><div>* produced by g2ctl v0.0.8.2</div>
<div>* command line options: gfs.t06z.mastergrb2f03</div><div>* griddef=1:0:(720 x 361):grid_template=0:winds(N/S): lat-lon grid:(720 x 361) units 1e-06 input WE:NS output WE:SN res 48 lat 90.000000 to -90.000000 by 0.500000 lon 0.000000 to 359.500000 by 0.500000 #points=259920:winds(N/S)</div>
<div><br></div><div>dtype grib2</div><div>ydef 361 linear -90.000000 0.5</div><div>xdef 720 linear 0.000000 0.500000</div><div>tdef 9 linear 09Z08feb2012 3hr</div><div>zdef 1 linear 1 1</div><div>vars 6</div><div>GUSTsfc 0,1,0 0,2,22 ** surface Wind Speed (Gust) [m/s]</div>
<div>PRATEsfc 0,1,0 0,1,7,0 ** surface Precipitation Rate [kg/m^2/s]</div><div>TMPsfc 0,1,0 0,0,0 ** surface Temperature [K]</div><div>TMP2m 0,103,2 0,0,0 ** 2 m above ground Temperature [K]</div><div>UGRD10m 0,103,10 0,2,2 ** 10 m above ground U-Component of Wind [m/s]</div>
<div>VGRD10m 0,103,10 0,2,3 ** 10 m above ground V-Component of Wind [m/s]</div><div>ENDVARS</div></div><div><br></div><div>2012/2/8 Yaqiang Wang <span dir="ltr"><<a href="mailto:yaqiang.wang@gmail.com">yaqiang.wang@gmail.com</a>></span><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Grib file is composed of independent messages, so the concatenating<br>
method is quite easy.<br>
<br>
Windows: copy /b file1.grib+file2.grib newfile.grib<br>
<br>
Linux: cat file1.grib file2.grib > newfile.grib<br>
<div><div class="h5"><br>
On Wed, Feb 8, 2012 at 2:43 AM, Jeff Duda <<a href="mailto:jeffduda319@gmail.com">jeffduda319@gmail.com</a>> wrote:<br>
> You don't need to go through the mess of concatenating GRIB files. Just<br>
> write a control file for one of the GRIB files and use templates over time<br>
> to tell Grads to open several files at once. You'll have to adjust your<br>
> TDEF line as well, then use the gribmap utility to create an index file for<br>
> the template control file you made.<br>
><br>
> Jeff Duda<br>
><br>
> On Tue, Feb 7, 2012 at 12:24 PM, Miquel Traveria <<a href="mailto:traveria@gmail.com">traveria@gmail.com</a>> wrote:<br>
>><br>
>> Hello all,<br>
>><br>
>> I want to create (display) a time series of temperature at one grid point.<br>
>> I downloaded 8 consecutive GRIB files with the Temperature over an area, and<br>
>> I want to concatenate all the files in a sigle file to use GRADS to display<br>
>> the time series over one node. How can I concatenate the files?<br>
>><br>
>> Or there is another possibility in GRADS to load the 8 files and display a<br>
>> time series in a node?<br>
>><br>
>> Any help will be very welcome!<br>
>><br>
>> Sincerely,<br>
>><br>
>> Miquel<br>
>><br>
>><br>
>><br>
>><br>
>> _______________________________________________<br>
>> gradsusr mailing list<br>
>> <a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
>> <a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>><br>
><br>
><br>
><br>
> --<br>
> Jeff Duda<br>
> Graduate research assistant<br>
> University of Oklahoma School of Meteorology<br>
> Center for Analysis and Prediction of Storms<br>
><br>
><br>
> _______________________________________________<br>
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><br>
<br>
<br>
<br>
--<br>
</div></div>*************************************************<br>
Dr. Yaqiang Wang<br>
Chinese Academy of Meteorological Sciences (CAMS)<br>
46, Zhong-Guan-Cun South Avenue<br>
Beijing, 100081<br>
China<br>
<br>
<a href="mailto:yaqiang.wang@gmail.com">yaqiang.wang@gmail.com</a><br>
<br>
<a href="http://www.meteothinker.com" target="_blank">http://www.meteothinker.com</a><br>
**************************************************<br>
<div class="HOEnZb"><div class="h5"><br>
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</div></div></blockquote></div><br></div></div>