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<p class="MsoNormal"><span style="font-size:11.0pt">It should work if you change:<br>
dtype netcdf <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">to <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">dtype hdf5_grid<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><br>
The HDF5 interface does support groups, and netcdf4 is really an hdf5 file under the hood.<br>
--Jennifer <br>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;color:#212121">-- </span><span style="font-size:9.0pt;color:black"><br>
<b>Jennifer Miletta Adams</b><br>
Senior Scientific Software Developer<br>
Goddard Earth Sciences Data and Information Services Center (GES DISC)</span><span style="font-size:12.0pt;color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:black">NASA/GSFC, Code 619</span><span style="font-size:12.0pt;color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#404040">Building 32, Room S159</span><span style="font-size:12.0pt;color:#404040"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">gradsusr <gradsusr-bounces@gradsusr.org> on behalf of M.Mahakur <mmahakur@tropmet.res.in><br>
<b>Date: </b>Monday, November 20, 2023 at 2:43 PM<br>
<b>To: </b>GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Subject: </b>[EXTERNAL] [BULK] [gradsusr] netcdf group variable<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Dear All,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">I like to display the variable "value" from the attached small netcdf file. I feel the pressure level variable is in the group 'IWC/PressureGrid'. For this I created
the ctl :<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">dset MLS-Aura_L3DB-IWC_v04-24-c01_2022d365.nc<br>
title MLS IWC<br>
dtype netcdf<br>
undef -999.99<br>
xdef 72 linear -177.5 5.0<br>
ydef 45 linear -88.0 4.0<br>
zdef 29 levels 1000, 825.4042, 681.2921, 562.3413, 464.1589, 383.1187, 316.2278, 261.0157, 215.4435, 177.8279, 146.7799, 121.1528, 100, 82.54042, 68.1292, 56.23413, 46.41589, 38.31187, 31.62278, 26.10157, 21.54435, 17.78279, 14.67799, 12.11528, 10, 1, 0.1,
0.01, 0.001<br>
tdef 1 linear 1DEC2022 1dy<br>
vars 1<br>
/IWC/PressureGrid/value=>val 29 t,z,x,y IWC (mg/m3)<br>
endvars<br>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">But, it does not works. It seems it does not matches with the variable!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366">ga-> d val
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366">Error: Variable /IWC/PressureGrid/value not in netcdf file
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366">Data Request Error: Error for variable 'val'
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366"> Error ocurred at column 1
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366">DISPLAY error: Invalid expression
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#993366"> Expression = val</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">i am using Grads 2.0.a9. A portion from the ncdump is:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">=========================<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">group: IWC\ PressureGrid {<br>
dimensions:<br>
lat = 45 ;<br>
lon = 72 ;<br>
lev = 29 ;<br>
time = 1 ;<br>
nv = 2 ;<br>
variables:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">....<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">float value(time, lev, lon, lat) ;<br>
string value:long_name = "Average Value of Cloud Ice" ;<br>
string value:units = "mg/m!U3!N" ;<br>
value:_FillValue = -999.99f ;<br>
string value:comments = "The average value in a bin" ;<br>
============================<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Please suggest, where to modify in the ctl.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Thanks and Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Mahakur<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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