Re: Spatial and Temporal Averages

[Ansley Manke <Ansley.B.Manke@xxxxxxxx>]

Hi Rolando,
The best way to do a time average with more than just a few
files would be to treat them as one dataset.  You can do
this with a descriptor file - see "multi-file datasets" in the
Users Guide for how to set up a descriptor file.  Then you can
refer to all your data as one dataset, and do a time average
using the @AVE syntax, just as in the command you show.

Ansley Manke

"Rolando S. Balotro" wrote:

> Hello All
>
> Im taking spatial average of current components say between layers
> 0 to 100m and listing to a file:
>
> set data hyruns3Z.10.232.nc
> yes? list /file=augavr0to10m.dat  /J /I U_VELOCITY[Z=0:100@AVE],
> V_VELOCITY[Z=0:100@AVE]
> LISTing to file augavr0to10m.dat
>
> It works just fine.
>
> But how do you do this for the case of temporal averaging when you have
> several files to consider (say daily for a month) for each grid point?
>
> Thanks a lot.
>
> roland
>
> Ansley Manke wrote:
> > Hi Xavier,
> > If you are trying to overlay a variable of file 2 on a plot
> > of a variable from the first file, you have to do something to
> > regrid the variables to a common grid.  But simply having
> > other datasets open should  not be a problem.  For example
> >
> > yes? use etopo60
> > yes? use coads_climatology
> >
> > yes? show data
> > ! the ETOPO60 grid is twice as dense as COADS in x-y
> >
> >  !   You can plot data from either dataset alone
> >
> > yes? shade/L=1 slp
> > yes? shade rose[d=1]
> >
> > !  Or, you can combine variables from the datasets on one plot,
> > !  if you regrid data from one of the datasets to the grid of the
> > !  first one plotted.
> >
> > yes? shade rose[d=1]
> > yes? contour/over/L=1 slp[g=rose[d=1]
> >
> >
> > If this does not answer your question, could you include more
> > of an example of the commands you are using?
> >
> > Ansley Manke
> >
> >
> >
> > Xavier Giraud wrote:
> >
> >
> >>Dear Ferret users,
> >>
> >>Here is my problem :
> >>
> >>2 Netcdf files, with the same variables (names), but produced on
> >>different grids (dimensions).
> >>file_1 : i=1:8  j=1:4529
> >>file_2 : i=1:182  j=1:149
> >>
> >>the script :
> >>
> >>use file_1
> >>use file_2
> >>shade var_of_file_2 ....
> >>
> >>--> when I shade file_2, it considers the dimensions of file_1 (and
> >>obviously produces an error).
> >>
> >>Does anyone have a solution ?
> >>
> >>Thanks in advance
> >>
> >>--
> >>Xavier Giraud
> >>Max Planck Institut fuer Biogeochemie
> >>Winzerlaer strasse 10
> >>07745 Jena, Germany
> >>
> >>tel: +49 3641 57 62 21
> >>fax: +49 3641 57 72 00
> >>
> >>http://www.bgc-jena.mpg.de/~xavier.giraud/
> >
> >
> >

--
Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA  (206)526-6246