Re: [ferret_users] Subsample in time

[Ge Peng <gpeng@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi Ansley,

Perfect!  Thanks a lot!

--- Peng


> Hi Peng,
> You can use formatted time strings, for instance,
>
>    set region/x=120W:160W/y=20S:20N/T="1-jan-2000":"15-mar-2001"
>
> The same syntax can be used anytime you have a time axis that's defined
> in terms of calendar dates.  Your axis is in days, so the above
> formatting is adequate, but if necessary, then hours, minutes or seconds
> can be used.  The above command could be written,
>
>    set
> region/x=120W:160W/y=20S:20N/T="1-jan-2000:00:00:00":"15-mar-2001:00:00:00"
>
> Ansley
>
> Ge Peng wrote:
>> Hi,
>>
>> I have a weekly sst data set that I would like to subsample for a given
>> yr1-yr2 range without re-griding.  The description of time in the data
>> is
>> given at the end of this message.
>>
>> Is there a simple way to define a region for time like defining x or y
>> region, e.g.: set region/x=120W:160W/y=20S:20N?
>>
>> If not, I would like to get help in determining day and month for the
>> first record in the dataset for yr1 and the last record for yr2.
>>
>> Thanks,
>>
>> --- Peng
>>
>>
>> --------------
>>         double time(time) ;
>>                 time:units = "days since 1800-1-1 00:00:00" ;
>>                 time:long_name = "Time" ;
>>                 time:actual_range = 69395., 76514. ;
>>                 time:delta_t = "0000-00-07 00:00:00" ;
>>                 time:avg_period = "0000-00-07 00:00:00" ;
>>                 time:standard_name = "time" ;
>>                 time:axis = "t" ;
>>         double time_bnds(time, nbnds) ;
>>                 time_bnds:long_name = "Time Boundaries" ;
>>
>>
>