Re: changing origin time scale

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Francois,

Ferret-level:
Adding one small detail to mark Verschell's answer using Ferret, since
your time axis is irregular you can use the /FROM_DATA qualifier

	define axis/t/name=newt/from_data/t0="**corrected**" t[g=myvar]

to create a new irregular time axis "newt" from the original time
points. Note, however, that the resultant time step values are actually
single precision.


Unix-level:
A simple approach, using the unix-netCDF tools ncdump and ncgen is:

 ncdump myfile.nc | sed 's/2-jan-1961/2-jan-1960/g' | ncgen -o
newfile.nc

Note that the sed strings are case sensitive.

	Happy Ferreting - steve

=====================================================================

Francois Delclaux wrote:
> 
> Hi,
> 
> I have a netcdf file (x,y,t) with 12600 values on t-axis,
> 
> and (33,25) values on (x,y) axes (21 Mbytes file )
> 
> This t-axis is irregular, 360 days for 35 years. But a error has been made
> 
> concerning the time origin.
> 
> I would like to make a time-translation, and
> 
> to change the origin, ie, to make the file begin the 2 january 1960
> 
> instead of the 2 january 1961.
> 
> What's the best way to do this opration, in ferret or another netcdf tools ...
> 
> (avoiding fortran  program development !)
> 
> Thank's in advance
> 
> --
> DELCLAUX  Francois
> -----------------------------------------------------------
> IRD (ex ORSTOM) Hydrologie
> BP 5045    34032 Montpellier Cedex           FRANCE
> http://www.mpl.orstom.fr/~delclaux/
> mailto:Francois.Delclaux@mpl.orstom.fr
> Tel : (33) (0)4-67-41-64-42     Fax : (33) (0)4-67-54-71-06
> -----------------------------------------------------------

-- 

                |  NOAA/PMEL               |  ph. (206) 526-6080  
Steve Hankin    |  7600 Sand Point Way NE  |  FAX (206) 526-6744
                |  Seattle, WA 98115-0070  |  hankin@pmel.noaa.gov