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<p style="margin-top:0;margin-bottom:0">Hi Jennifer!</p>
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<p style="margin-top:0;margin-bottom:0">So, if some of the datasets aren't available during averaging, what happens to those data? Are 0s used in the averaging?</p>
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<div style="color:rgb(0,0,0); font-family:Tahoma; font-size:13px"><font face="Calibri,Arial,Helvetica,sans-serif"><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9" style=""><span style="font-size:11pt"><b><span style="font-size:12pt">Aaron
D. Perry</span></b></span></font><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9"><span style="font-size:12pt"><br>
</span></font><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9"><span style="font-size:12pt">Class of 2016</span></font><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9"><span style="font-size:12pt"><br>
</span></font><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9"><span style="font-size:12pt">Lyndon State College</span></font><font face="Calibri,Arial,Helvetica,sans-serif" size="2" color="#006FC9"><span style="font-size:12pt"><br>
Lyndonville, VT 05851</span></font></font></div>
<div style="color:rgb(0,0,0); font-family:Tahoma; font-size:13px"><font face="Calibri,Arial,Helvetica,sans-serif"><font size="2" color="#006FC9"><span style="font-size:12pt">Twitter: </span></font><font size="2"><span style="font-size:11pt"><a href="https://twitter.com/arnpry" target="_blank" id="LPNoLP"><span style="font-size:12pt">@arnpry</span></a></span></font></font></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Jennifer M Adams <jadams21@gmu.edu><br>
<b>Sent:</b> Tuesday, January 23, 2018 7:13:25 AM<br>
<b>To:</b> GrADS Users Forum<br>
<b>Subject:</b> Re: [gradsusr] Averaging Multiple Data sets with Different Temporal Resolutions</font>
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<br>
> On Jan 22, 2018, at 7:49 PM, Jeff Duda <jeffduda319@gmail.com> wrote:<br>
> <br>
> <br>
> Your blend would become "missing data" and you would get no plot at all once even one of the input fields dropped out.<br>
^^ This is incorrect. <br>
<br>
As it calculates averages, GrADS keeps track of missing data and weights the average accordingly. You will get a missing value in the result only if *all* the values are missing. For the time steps where *some* of the models are missing, you will get an average
of the available models. <br>
—Jennifer<br>
<br>
> On Fri, Jan 19, 2018 at 10:19 AM, Perry, Aaron <Aaron.Perry@lsc.vsc.edu> wrote:<br>
> I have a hypothetical question...<br>
> <br>
> If you were to blend multiple data sets together with varying temporal resolutions, (and after lterp'ing them all to the same grid) what would happen with one of the data sets if it's data time ran out before the others did?<br>
> <br>
> Ex.<br>
> <br>
> ND = No Data<br>
> <br>
> TAU 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 168 174 180 186
192 198 204 210 216 222 228 234 240<br>
> GFS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - -<br>
> CMC - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - -<br>
> ECM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - -<br>
> NAM3 - - - - - - - - - - - ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND<br>
> NAM12 - - - - - - - - - - - - - - - ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND<br>
> <br>
> <br>
> 'define blend = (GFS+CMC+ECM+NAM3+NAM12)/5.0'<br>
> <br>
> Would the sudden data drop-out in the average result in 0s being introduced into the average? How would you keep the data (last valid timestep) that runs out included in the overall average?<br>
> <br>
> Cheers,<br>
> <br>
> <br>
> Aaron D. Perry<br>
> Class of 2016<br>
> Lyndon State College<br>
> Lyndonville, VT 05851<br>
> Twitter: @arnpry<br>
> Email: Aaron.Perry@lyndonstate.edu<br>
> <br>
> _______________________________________________<br>
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> gradsusr@gradsusr.org<br>
> <a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
> <br>
> <br>
> <br>
> <br>
> -- <br>
> Jeff Duda<br>
> Research Scientist<br>
> Cooperative Institute for Research in Environmental Sciences at the University of Colorado<br>
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> gradsusr@gradsusr.org<br>
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<br>
--<br>
Jennifer Miletta Adams<br>
Center for Ocean-Land-Atmosphere Studies (COLA)<br>
George Mason University<br>
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