Re: grib data with multiple time axis

Hi Prince,
Without seeing the file itself it is hard to know exactly what is going on. I believe that NCL is supposed to convert from units of day to units of month when the specified number of days equals the number of days in the designated month. Can you send the file to me (offline) or upload it to the ftp site using the directions at http://www.ncl.ucar.edu/report_bug.shtml?
Thanks.
 -dave

On Jul 15, 2013, at 12:21 AM, Prince K XAVIER <prince.xavier@gmail.com> wrote:

> Hi All,
> I have a grib file with the following attributes. NCL sees it as two time coordinates with lengths 2 and 3, while conversion to netcdf using cdo produces a single time axis of length 5. It looks like NCL collects the 2 months with 30 days as one coordinate and the remaining 3 months with 31 days as another.
>
> This makes me wonder why there is such difference and which way of reading is likely to give me the right answer. Any suggestions on how to read the data as one single time coordinate are most welcome.
>
> Cheers,
> Prince
>
> Variable: f
> Type: file
> filename: cc_199606_199607_199611_run01
> path: cc_199606_199607_199611_run01.grb1
> file global attributes:
> dimensions:
> forecast_time0 = 2
> g0_lat_1 = 73
> g0_lon_2 = 144
> forecast_time3 = 3
> variables:
> float V_GRD_GDS0_SFC_ave30d ( forecast_time0, g0_lat_1, g0_lon_2 )
> center : xx
> long_name : v-component of wind
> units : m/s
> _FillValue : 1e+20
> level_indicator : 1
> gds_grid_type : 0
> parameter_table_version : 1
> parameter_number : 34
> initial_time : 05/25/1996 (00:00)
>
> float V_GRD_GDS0_SFC_ave31d ( forecast_time3, g0_lat_1, g0_lon_2 )
> center : xx
> long_name : v-component of wind
> units : m/s
> _FillValue : 1e+20
> level_indicator : 1
> gds_grid_type : 0
> parameter_table_version : 1
> parameter_number : 34
> initial_time : 05/25/1996 (00:00)
>
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Received on Mon Jul 15 15:31:02 2013