Re: [ferret_users] modulo=0 ?

To: "Ansley C. Manke" <ansley.b.manke@xxxxxxxx>

Subject: Re: [ferret_users] modulo=0 ?

From: Ryo Furue <furue@xxxxxxxxxx>

Date: Sun, 27 Sep 2020 02:27:25 +0900

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Hi Ansley,

Thank you for your clear explanation!

On Sat, Sep 26, 2020 at 2:30 AM Ansley C. Manke <ansley.b.manke@xxxxxxxx> wrote:

Probably what should instead be listed in the attribute is the actual length of the axis as defined.

I see. That would increase the chance of compatibility with other software.

Note the "axis span" shown here - this is what is used in modulo calculations.

yes? define axis/t0=1-JAN-0001/calendar=noleap/edges/t=0:365/npoints=73\ /units=days/MODULO pntd[ . . . ] Axis span (to cell edges) = 365 (modulo length = axis span)

L T TBOX TBOXLO TSTEP (DAYS) 1> 03-JAN 12:00:00 5 01-JAN 00:00:00 2.5 2> 08-JAN 12:00:00 5 06-JAN 00:00:00 7.5

Aha. That makes perfect sense. As usual, Ferret assumes the box centered about each gridpoint. Thanks.

By the way, I've just noticed that Ferret doesn't include the point_spacing = "even" attribute or the cell-boundary variable (PNTD_bnds for the above example) in the output netCDF file for the above time axis.

Best regards,

Ryo