Re: [ferret_users] loading 360_day netcdf data

[Cyndy Chandler <cchandler@xxxxxxxx>]

Hello Malte,

I just ran into this yesterday!

You'll want to tell ferret to use a calendar type of 360_DAY 
I found the info in the User Guide (I think in the section that 
discusses the time axis).

here's the User Guide example:
Define a calendar axis and regrid an existing variable to this axis:
yes? DEFINE 
AXIS/CALENDAR=360_DAY/T="15-JAN-1982":"15-DEC-1985":30/UNITS=days tmodel
yes? LET twind = uwnd[GT=tmodel@NRST]


I used NCO tools, ncatted, to add the calendar type to the NetCDF file 
itself:
ncatted -O -a calendar,TIME,o,c,"360_DAY" $nc_file

double TIME(TIME) ;
               TIME:units = "days since 01-FEB-1829" ;
               TIME:axis = "T" ;
               TIME:time_origin = "01-FEB-1829" ;
               TIME:calendar = "360_DAY" ;

Then ferret uses that information to define the Time axis.

sho axis/T TIME
name       axis              # pts     start                            end
TIME      TIME                62 r   01-JAN-1940 00:00    01-JAN-2001 00:00
T0 = 01-FEB-1829 00:00:00
CALENDAR = 360_DAY

hope this helps,
Cyndy


Malte Jansen wrote:

> Hello,
>
> I use a (10 years - daily data) netcdf dataset with a 360_day calendar. When I load it in ferret, ferret seems to interpret it as a gregorian calendar in the following funny way:
>
> yes? use/order=xyzt burnout.nc
> yes? show/l=355:370 grid temp
> ls: /usr/local/ferret/ext_func/libs/: No such file or directory
>    GRID GTO1
> name        axis                       # pts     start                         end
> LON         LONGITUDE           65 r      0E                           0E(360)
> LAT         Y (degrees_nor        32 i-    -85.761                   85.761
> HEIGHT    Z (hPa)                    3 i-    200                          1000
> TIME        TIME                  3600 i      01-JAN      00:00      24-DEC-0010 00:00
>
>       L     T                   TBOX                 TBOXLO                     TSTEP (days)
>     355>  21-DEC      00:00:00      1         20-DEC      12:00:00       354
>     356>  22-DEC      00:00:00      1         21-DEC      12:00:00       355
>     357>  23-DEC      00:00:00      1         22-DEC      12:00:00       356
>     358>  24-DEC      00:00:00      1         23-DEC      12:00:00       357
>     359>  25-DEC      00:00:00      1         24-DEC      12:00:00       358
>     360>  26-DEC      00:00:00      3.5       25-DEC      12:00:00       359
>     361>  01-JAN-0002 00:00:00  3.5       29-DEC      00:00:00       365
>     362>  02-JAN-0002 00:00:00  1         01-JAN-0002 12:00:00    366
>     363>  03-JAN-0002 00:00:00  1         02-JAN-0002 12:00:00    367
>     364>  04-JAN-0002 00:00:00  1         03-JAN-0002 12:00:00    368
>     365>  05-JAN-0002 00:00:00  1         04-JAN-0002 12:00:00    369
>     366>  06-JAN-0002 00:00:00  1         05-JAN-0002 12:00:00    370
>     367>  07-JAN-0002 00:00:00  1         06-JAN-0002 12:00:00    371
>     368>  08-JAN-0002 00:00:00  1         07-JAN-0002 12:00:00    372
>     369>  09-JAN-0002 00:00:00  1         08-JAN-0002 12:00:00    373
>     370>  10-JAN-0002 00:00:00  1         09-JAN-0002 12:00:00    374
>
> how can I make Ferret accept my data as 360_day data ?
>
> Thanks
> Malte
>
>  

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Cyndy Chandler		| voice: (508) 289-2765
MS #43, WHOI		| Office hrs: M-F ~ 9-4
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cchandler@whoi.edu | http://www.whoi.edu/people/cchandler
Ocean Carbon and Biogeochemistry Data Management Office
Department of Marine Chemistry and Geochemistry
Woods Hole Oceanographic Institution