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Re: [ferret_users] Edges and @AVG
- To: Alexander Audet <alexander.c.audet@xxxxxxxxx>
- Subject: Re: [ferret_users] Edges and @AVG
- From: "William S. Kessler" <william.s.kessler@xxxxxxxx>
- Date: Tue, 25 Feb 2020 13:28:14 -0800
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> On Feb 25, 2020, at 12:26 PM, Alexander Audet <alexander.c.audet@xxxxxxxxx> wrote:
>
> The full fix would probably be to first regrid it into proper 1-month time slots using the @ASN transformation as described in the above link, then regrid it a second time into the seasonal 3 months using the @AVG.
There's a danger here: The first step of averaging to put the data onto explicit months when the time points are centered on the first of the month is a smoothing operation before you start to do anything else. Won't that have a larger effect than the length-of-month problem?
It seems to me that "1/2 December, January, February, and 1/2 of March" is the right way (least smoothing) to define DJF. You could do this manually, or use @ave specifying dates; in that case if Ferret understands the calendar it will do this correctly.
Billy K
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