<div dir="ltr"><div><div>Hi Joshua,<br></div>It seems that you merged the files correctly using cdo mergetime. There are other options as well for merging such as cdo copy and cdo cat. To merge multiple files just use a wild character for file names eg. cdo mergetime MOD*. It will work. If the merged file doesn't open using sdfopen, then use xdfopen. <br>
<br><br></div>-Sagar<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 29, 2013 at 7:08 AM, Joshua Ngaina <span dir="ltr"><<a href="mailto:jngaina@gmail.com" target="_blank">jngaina@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"><div><br>
</div><div><b>Dear All,<br><br></b></div><div><b>I have daily MODIS aerosol products (Small mode fraction). <br><br></b></div><div><b>I wanted to merge these files using CDO but it seemed the files were not merged. </b><br>
<br>met@met-HP-Compaq-6000-Pro-MT-PC:/media/BERTH/MODIS_DAILY$ cdo mergetime *.nc ALLMOD08.nc<br>cdo mergetime: Processed 4147200 values from 64 variables over 32 timesteps. ( 0.18s )<br><b><br>
So to check one of the files, I used grads and I got this error: <span>DF</span> <span>file</span> <span>has</span> <span>no</span> <span>discernable</span> <span>time</span> <span>coordinate</span> -- <span>using</span> <span>default</span> <span>values</span></b>. <br>
<br>ga-> sdfopen <a href="http://MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc" target="_blank">MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc</a><br>
Scanning self-describing file: <a href="http://MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc" target="_blank">MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc</a><br>
SDF file has no discernable time coordinate -- using default values.<br>SDF file <a href="http://MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc" target="_blank">MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc</a> is open as file 1<br>
LON set to 0 360 <br>LAT set to -89.5 89.5 <br>LEV set to 0 0 <br>Time values set: 1:1:1:0 1:1:1:0 <br>E set to 1 1 <br>ga-> q file<br>File 1 : <br> Descriptor: <a href="http://MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc" target="_blank">MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc</a><br>
Binary: <a href="http://MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc" target="_blank">MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc</a><br>
Type = Gridded<br> Xsize = 360 Ysize = 180 Zsize = 1 Tsize = 1 Esize = 1<br> Number of Variables = 2<br> optical_depth_l 0 y,x Aerosol Optical Thickness at 0.55 microns for both Ocean (best) and Land (corrected): Mean<br>
optical_depth_r 0 y,x Ratio of small mode aerosol optical depth at 0.55 micron for both land and ocean: Mean<br><b><br></b></div><div><b>I also checked the merged netcdf file </b><br><br>ga-> sdfopen ALLMOD08.nc <br>
Scanning self-describing file: ALLMOD08.nc<br>SDF file has no discernable time coordinate -- using default values.<br>SDF file ALLMOD08.nc is open as file 1<br>LON set to 0 360 <br>LAT set to -89.5 89.5 <br>LEV set to 0 0 <br>
Time values set: 1:1:1:0 1:1:1:0 <br>E set to 1 1 <br>ga-> q file<br>File 1 : <br> Descriptor: ALLMOD08.nc<br> Binary: ALLMOD08.nc<br> Type = Gridded<br> Xsize = 360 Ysize = 180 Zsize = 1 Tsize = 1 Esize = 1<br>
Number of Variables = 2<br> optical_depth_l 0 y,x Aerosol Optical Thickness at 0.55 microns for both Ocean (best) and Land (corrected): Mean<br> optical_depth_r 0 y,x Ratio of small mode aerosol optical depth at 0.55 micron for both land and ocean: Mean<br>
<br></div><div><b>I also noted that the dimension of both files were the same. <br><br></b></div><div><b>My major problem is with many files of this type, How do I merge this files for analysis with GrADs. Please advise<br>
</b></div><b><br></b><div>
<b><br>
Regards and Thanks,</b><br><br></div><div>Joshua Ngaina<br>
</div></div>
<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></blockquote></div><br><br clear="all"><br>-- <br>
<p><b><span style="color:#e36c0a"></span></b></p>Sincerely,<br><br><p><b><span style="color:#e36c0a">
</span></b></p>
<p><b><span style="color:#e36c0a">Sagar P. Parajuli</span></b></p><p><b><span style="color:#e36c0a"></span></b><span style="color:#e36c0a">Graduate
Research Assistant</span></p><p><span style="color:#e36c0a">The University of Texas at
Austin<br>
Jackson School of Geosciences<br>e-mail: <a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a></span></p><span style="color:#e36c0a">Contact: +1 512 965 4093</span>
</div>