Re: [ferret_users] append variables on time when time reference (since date) are different

[Hein Zelle <hein.zelle@xxxxxxxxxxxxx>]

Dear Ansley, Patrick,

> Ferret's graphics lets you view plots of variables on different time
> axes together using /HLIM or /VLIM. I think this is causing some
> confusion. To save them to a single dataset, appending them, you
> would need to put them onto a common time axis, and it is up to the
> user to make sure that the time origin and axis units match.

I've run into this issue as well.  Does Ferret deal correctly with
regridding to a common time axis?  i.e.

dataset 1: time axis starts at 01-01-1970, hourly data
dataset 2: time axis starts at 01-01-1990, hourly data

define new axis my_t starting at 01-01-1900, hourly 

let var3 = var1[d=1,gt=my_t] + var2[d=2, gt=my_t]
save (/append) /file=test.nc   var3

Will that do what I expect/want ?  If so, it's a perfectly acceptable
workaround, but it would be very nice indeed if ferret issues a
warning or an error when you're incorrectly combining time axes with
append.


Kind regards,
     Hein

-- 

Dr. Hein Zelle
Advisor Meteorology & Oceanography

Tel:    +31 (0)527-242299
Fax:    +31 (0)527-242016
Email:  hein.zelle@xxxxxxxxxxxxx
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