Re: Buglet with ut_calendar()

Hi Bill,

This is the first "buglet" we've received!

The ut_calendar function is a straight interface to the Udunits
"utCalendar" interface, which is part of the Udunits software package.

It looks like C program version of utCalendar is producing the same
results, so NCL is behaving as expected.

However, I'm interested in finding out more about what this extra "t"
means. I think IDV may be handling this type of units specially, or
else they have modified the utCalendar to recognize it.

Does IDV have any documentation on this?

--Mary

On Nov 5, 2009, at 9:51 AM, Capehart, William J wrote:

>
> Hi guys,
>
> I may have found a small buglet with ut_calendar
>
> for the following time variable (and most importantly the unit
> description)
>
> Variable: time
> Type: integer
> Total Size: 36 bytes
> 9 values
> Number of Dimensions: 1
> Dimensions and sizes: [nt_time | 9]
> Coordinates:
> Number Of Attributes: 5
> long_name : forecast time
> units : hour since 2009-10-29t06:00:00z
> _CoordinateAxisType : time
> valid_max : 24
> valid_min : 0
> (0) 0
> (1) 3
> (2) 6
> (3) 9
> (4) 12
> (5) 15
> (6) 18
> (7) 21
> (8) 24
>
> Note the t separating the Date and Time in the time@units attribute.
>
> The output of ut_calendar becomes
>
> ncl 19> print(ut_calendar(time,3))
> Variable: unnamed (return)
> Type: double
> Total Size: 72 bytes
> 9 values
> Number of Dimensions: 1
> Dimensions and sizes: [9]
> Coordinates:
> Number Of Attributes: 1
> calendar : standard
> (0) 2009102900
> (1) 2009102903
> (2) 2009102906
> (3) 2009102909
> (4) 2009102912
> (5) 2009102915
> (6) 2009102918
> (7) 2009102921
> (8) 2009103000
>
>
> when I take out the character separating the date from the time
> (replacing it with a space), it’s ok. but as I understand it and
> have seen in other packages (e.g., IDV), the t is accepted – in fact
> IDV adds the “t” when it converts a GRIB file into netcdf.
>
> Can that be patched for 5.1.2?
>
> Thanks Much
> Bill
>
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Received on Thu Nov 5 21:34:45 2009