Re: [ferret_users] data from netcdf file automatically reversed

[Hein Zelle <hein.zelle@xxxxxxxxxxxxx>]

Yue Chao wrote:

> Thank you Ansley. I do think it's the problem of time coordinate. Actually
> when I show data:
> 
> using ncdump -c data.nc
> ....
>  time_counter = 15768000, -78926400, 15768000, 15768000, -78926400,
>     -15854400, -47390400, -15854400, -110462400, -78926400, -78926400,

That's a problem indeed: ferret is counting seconds since 2005-01-01,
and you're feeding it alternating positive and negative values.  A
time axis should typically be (preferably continuously) increasing.  

If you want to show real time values, you have to assign a time axis
yourself.  See the "define axis" command in the manual for examples on
how to do that.  If you just want to show the index along the time
axis, try this:

use data.nc

! replace broken time_counter axis
define axis /t=1:389:1 time_counter

it will probably issue a warning that your data may now appear
different, but that's what you want in this case.  You'll now simply
get time values ranging from 1 to 389, with no proper date/time or
unit assigned.

Kind regards,

     Hein Zelle



-- 

Dr. Hein Zelle
Advisor Meteorology & Oceanography

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