Re: Changing dimension values?

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: Re: Changing dimension values?
• From: hankin@xxxxxxxxxxxxxxxxxxx (Steve Hankin)
• Date: Thu, 5 Sep 1996 08:33:20 -0700

On Sep 4, 10:50pm, Gary Strand wrote:
> Subject: Changing dimension values?
>
> This is probably a stupid question, but is there an easier way than using nc-
> dump to change a dimension's values? Say I want to change time from seconds
to
> days - just divide every value appropriately. However, I've got quite a lot
of
> data to go through and a painless method would be very nice.
>
> Thanks for any advice/suggestions.
> --
> Gary Strand
> strandwg@xxxxxxxxxxxxx
                        http://www.cgd.ucar.edu/ccr/gary
>-- End of excerpt from Gary Strand

=========================================================

Hi Gary,

Since you're a Ferret user ...

The Ferret program can do all sorts of "messing with grids" on NetCDF files
that are "COARDS-standard" (see
http://www.unidata.ucar.edu/packages/netcdf/conventions.html).

For your question, use the DEFINE AXIS command to make a new time axis, say
"TDAYS", in units of days (time steps may be even or uneven). Then regrid your
variable along the T axis by "association" (replacement) using the syntax
"GT=TDAYS@ASN" as follows:

        LET var_in_days = var_in_secs[GT=TDAYS@ASN]
        SAVE/file=new_file.nc var_in_days


        cheers - steve



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• References:
  • Changing dimension values?
    • From: Gary Strand