[ferret_users] Re: ensembling datasets of different models

["Ansley C. Manke" <ansley.b.manke@xxxxxxxx>]

Hello,

This would be a better question for the Ferret list.  I am including the list here, as the ensemble capability is a new option in Ferret, and others will be interested in the question.

The variables in an ensemble must have the same name in each member dataset, and be on the same grid.  Decide which X-Y-T grid the aggregated variables should share, and then use LET/D= commands to define variables associated with each member dataset having that desired grid.

In the documentation on aggregations, http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/DEFINE#_define_data_agg,  read down, and under ENSEMBLE Examples, find the text: To define an ensemble where the variable names or grids do not match, and follow the example below that.  Note that you first do a SET VARIABLE/NAME= to rename the file variable, and then the LET/D=xx command can use the name that the variable will have in the ensemble.

Ansley

On 9/28/2017 11:20 PM, Prasad SJ. wrote:

Dear Support Team,

​I am trying to perform multi model ensembling. The following are the different datasets . when i tried to ensemble this datasets, the following error occurred. Could you please advise me further on the following. 

 

currently SET data sets:

    1> ./hy3d01to07jun17ffromcdl.nc

 name     title                             I         J         K         L         M         N

 UC       U1[X=@FAV:10,Y=@FAV:10]          1:168     1:171     ...       1:7       ...       ...

 VC       V1[X=@FAV:10,Y=@FAV:10]          1:168     1:171     ...       1:7       ...       ...

 

    2> ./kollammomregjun2017fromcdlfilled.nc

 name     title                             I         J         K         L         M         N

 UC       U[X=@FAV:10,Y=@FAV:10]           1:61      1:61      ...       1:44      ...       ...

 VC       V[X=@FAV:10,Y=@FAV:10]           1:61      1:61      ...       1:44      ...       ...

 

    3> ./krcnaxffromcdl.nc

 name     title                             I         J         K         L         M         N

 UC       U2[X=@FAV:10,Y=@FAV:10]          1:481     1:481     ...       1:56      ...       ...

 VC       V2[X=@FAV:10,Y=@FAV:10]          1:481     1:481     ...       1:56      ...       ...

 

    4> ./mg3kfromcdlucvc.nc  (default)

 name     title                             I         J         K         L         M         N

 UC       U[L=1:88]                        1:31      1:59      ...       1:88      ...       ...

 VC       V[L=1:88]                        1:31      1:59      ...       1:88      ...       ...

 

yes? ensemble new.nc= krcnaxffromcdl.nc,hy3d01to07jun17ffromcdl.nc,kollammomregjun2017fromcdlfilled.nc,mg3kfromcdlucvc.nc

           *** NOTE: Variable "UC" excluded from aggregate: X axis differs among members

           *** NOTE: Variable "VC" excluded from aggregate: X axis differs among members

 **ERROR: error defining aggregate dataset: No valid datasets or datasets share no variables.

​

Thanks and Regards

-SJP

S.J.Prasad

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