[gradsusr] Averaging Multiple Data sets with Different Temporal Resolutions

Jennifer M Adams jadams21 at gmu.edu
Tue Jan 23 11:35:02 EST 2018


No zeros. Only the good data values are included in the average. If you have only one model, then that one value is your result. If you have two models, then the average of those two is your result, etc. 
—Jennifer

> On Jan 23, 2018, at 10:31 AM, Perry, Aaron <Aaron.Perry at lsc.vsc.edu> wrote:
> 
> Hi Jennifer!
> 
> So, if some of the datasets aren't available during averaging, what happens to those data? Are 0s used in the averaging?
> 
> 
> Aaron D. Perry
> Class of 2016
> Lyndon State College
> Lyndonville, VT 05851
> Twitter: @arnpry
> Email: Aaron.Perry at lyndonstate.edu
> From: gradsusr <gradsusr-bounces at gradsusr.org> on behalf of Jennifer M Adams <jadams21 at gmu.edu>
> Sent: Tuesday, January 23, 2018 7:13:25 AM
> To: GrADS Users Forum
> Subject: Re: [gradsusr] Averaging Multiple Data sets with Different Temporal Resolutions
>  
> 
> 
> > On Jan 22, 2018, at 7:49 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> > 
> > 
> > Your blend would become "missing data" and you would get no plot at all once even one of the input fields dropped out.
> ^^ This is incorrect. 
> 
> 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. 
> —Jennifer
> 
> > On Fri, Jan 19, 2018 at 10:19 AM, Perry, Aaron <Aaron.Perry at lsc.vsc.edu> wrote:
> > I have a hypothetical question...
> > 
> > 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?
> > 
> > Ex.
> > 
> > ND = No Data
> > 
> > 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
> > GFS   -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -
> > CMC   -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -
> > ECM   -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -
> > 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
> > 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
> > 
> > 
> > 'define blend = (GFS+CMC+ECM+NAM3+NAM12)/5.0'
> > 
> > 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?
> > 
> > Cheers,
> > 
> > 
> > Aaron D. Perry
> > Class of 2016
> > Lyndon State College
> > Lyndonville, VT 05851
> > Twitter: @arnpry
> > Email: Aaron.Perry at lyndonstate.edu
> > 
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> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> > 
> > 
> > 
> > 
> > -- 
> > Jeff Duda
> > Research Scientist
> > Cooperative Institute for Research in Environmental Sciences at the University of Colorado
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
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> 
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
> 
> 
> 
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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University






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