Patrick, Lansing & Co:
I note that the time units for this dataset are:
"units: months since 1901-01-01 00:00:00"
with
"calendar: standard"
In the CF documentation
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/ch04s04.html
it warns about units of "month":
" We recommend that the unit year be used with caution. The Udunits
package defines a year to be exactly 365.242198781 days (the interval
between 2 successive passages of the sun through vernal equinox). It
is not a calendar year. Udunits includes the following definitions for
years: a common_year is 365 days, a leap_year is 366 days, a
Julian_year is 365.25 days, and a Gregorian_year is 365.2425 days.
For similar reasons the unit month, which is defined in udunits.dat to
be exactly year/12, should also be used with caution."
Perhaps the WMS and OPeNDAP service are not handling units of month in
the same way?
-Rich
On Wed, Apr 10, 2013 at 5:45 PM, Lansing Madry <madry@xxxxxxxxxxxxxxxx> wrote:
> Hi Patrick,
>
> I pulled down the file via http service and looked at it in ToolsUI.
> ToolsUI (perhaps unsurprisingly) gives the "1951-07-16T12:12:04.339Z" value.
> I'm not familiar with ferret as an OpenDAP client or viewer, have you heard
> from anyone on that front?
>
> Regards,
> Lansing Madry
> Unidata
> Boulder, Colorado
>
>
> On 4/9/2013 11:08 AM, Patrick Brockmann wrote:
>>
>> Hi all,
>>
>> I have a strange behaviour with time dimension values exposed by the
>> GetCapabilities
>> and values get from an OPeNDAP access.
>> Could someone explain me what is the source of the problem ?
>>
>>
>> http://webportals.ipsl.jussieu.fr/thredds/wms/CARBON/CARBONES_PRIOR_orchidee_hadgem2-es_historical_nosoc_co2_npp_monthly_1951_2004_yearmonmean_3.nc?service=WMS&version=1.3.0&request=GetCapabilities
>>
>> ---> 1951-07-16T12:12:04.339Z, ....
>>
>> And from the OPeNDAP access with ferret client, I get
>>
>> ferret
>> yes? use
>> "http://webportals.ipsl.jussieu.fr/thredds/dodsC/CARBON/CARBONES_PRIOR_orchidee_hadgem2-es_historical_nosoc_co2_npp_monthly_1951_2004_yearmonmean_3.nc";
>> yes? sg/t/l=1:10 npp2
>> GRID GTL2
>> name axis # pts start end
>> MYLON LONGITUDE 720mr 0E 0.5W
>> LAT LATITUDE 360 r 89.75S 89.75N
>> normal Z
>> TIME TIME 54 r 16-JUL-1951 12:33 15-JUL-2004 09:01
>>
>> L T TBOX TBOXLO TSTEP (months)
>> 1> 16-JUL-1951 12:33:59 12 14-JAN-1951 21:39:23 606.4526
>> 2> 15-JUL-1952 18:23:11 12 15-JAN-1952 03:28:35 618.4526
>> 3> 16-JUL-1953 00:12:23 12 14-JAN-1953 09:17:47 630.4526
>>
>> --> Note the difference between 1951-07-16T12:12:04.339Z and 16-JUL-1951
>> 12:33:59
>>
>> My TDS version is Version 4.3.15 - 20121218.1126
>>
>> Regards
>> Patrick
>>
>
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