Re: Strange time axis inconsitencies...

[verschel@xxxxxxxxxxxxxxxxxxxxx (Mark A. Verschell)]

Gary,

	It depends on your axis definition. Perhaps you need to define it in
such a way that prevents slipping. E.g.,

define axis/t="16-jan-0001:12":"16-dec-0300:12"/np=3600 .....

Mark

On Feb 8,  2:16pm, Gary Strand wrote:
> Subject: Strange time axis inconsitencies...
>
> I've got 300 years of monthly model run data that I've put into netCDF. For
> some strange reason, the time axis appears to be "slipping" as seen by
FERRET.
>
> For example:
>
>       Time stamp     Years since start
>    1: 16-JAN-0001    0.0417
>    2: 15-FEB-0001    0.1250
>    3: 18-MAR-0001    0.2083
>    4: 17-APR-0001    0.2917
>    5: 17-MAY-0001    0.3750
>    6: 17-JUN-0001    0.4583
>    [....]
> 3596: 06-JUN-0300  299.6250
> 3597: 06-JUL-0300  299.7083
> 3598: 05-AUG-0300  299.7917
> 3599: 05-SEP-0300  299.8750
> 3600: 05-OCT-0300  299.9583
>
> How come the last time in calendar form is off by ~75 days, despite the fact
> that the delta T is correct? I know that in 300 years there's 75 leap days,
> but the last column takes that into account.
>
> Here's the netCDF specification of the time axis:
>
>         double time(time) ;
>                 time:long_name = "time" ;
>                 time:units = "years since 0001-01-01" ;
>
> Thanks for any help anyone can offer.
> --
> Gary Strand
> strandwg@ucar.edu
                         http://www.cgd.ucar.edu/ccr/strandwg
>-- End of excerpt from Gary Strand




-- 
 Mark Verschell                     NASA/Goddard Space Flight Center
 verschell@neptune.gsfc.nasa.gov    Code 970/Lab. for Hydrospheric Proc.
 301-614-5669  Fax: 301-614-5666    Greenbelt, MD 20771

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