[gradsusr] Customize time axis

[Jennifer Adams]

It sounds like what you really need are two axes -- a time axis with a monthly increment, and another axis for the diurnal cycle at hours 8, 11, 14, and 23 (E with a size of 4 would be useful for that). You can't plot data at 12hourly and monthly increments in the same dimension. You will probably need a full descriptor to get it right. What does the ncdump output look like? 
--Jennifer



On May 20, 2014, at 1:32 PM, Stefano Materia wrote:

> Dear all,
> I am facing a very annoying problem which I am not able to get around.
> 
> I have netcdf data for the month of January, in which four temperatures
> are registered every day: at 8:00am, 11:00am, 2:00pm, 11:00pm. Basically,
> I have 124 values per month (31*4) specified at those exact times of the
> day, and this is how I want to graph them.
> 
>     RefTime =  1980-01-01 06:00:00  Units = days  Calendar = standard
>  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss YYYY-MM-DD
> hh:mm:ss
>  1980-01-01 08:00:00  1980-01-01 11:00:00  1980-01-01 14:00:00 1980-01-01
> 23:00:00
>  1980-01-02 08:00:00  1980-01-02 11:00:00  1980-01-02 14:00:00 1980-01-02
> 23:00:00
>  1980-01-03 08:00:00  1980-01-03 11:00:00  1980-01-03 14:00:00 1980-01-03
> 23:00:00
>  1980-01-04 08:00:00  1980-01-04 11:00:00  1980-01-04 14:00:00 1980-01-04
> 23:00:00
>  ...
> 
> When I try to plot this in Grads though, the time axis becomes
> disarranged: Grads splits the time steps every three hours
> 
> ga-> q file
> File 1 :
>  Descriptor: tday_jan_daymean_1981-2010.nc
>  Binary: tday_jan_daymean_1981-2010.nc
>  Type = Gridded
>  Xsize = 464  Ysize = 201  Zsize = 1  Tsize = 124  Esize = 1
>  Number of Variables = 1
>     tn  0  t,y,x  temperature
> ga-> set t 1
> Time values set: 1980:1:1:8 1980:1:1:8
> ga-> set t 2
> Time values set: 1980:1:1:11 1980:1:1:11
> ga-> set t 3
> Time values set: 1980:1:1:14 1980:1:1:14
> ga-> set t 4
> Time values set: 1980:1:1:17 1980:1:1:17
> ga-> set t 5
> Time values set: 1980:1:1:20 1980:1:1:20
> ga-> set t 6
> Time values set: 1980:1:1:20 1980:1:1:23
> 
> This is not right, because I need my points to be centered at the time
> temperature are registered. Attached, a snapshot of the wrong plot coming
> out (for simplicity, I plotted up to the 16th timestep, which should be
> Jan 4, but it's not).
> 
> I do not even find a way to specify this into the TDEF of a ctl file.
> 
> Is anyone able to help me?
> Thanks a lot!
> 
> -- 
> Stefano Materia, PhD
> Centro Euro-Mediterraneo sui Cambiamenti Climatici
> Viale Aldo Moro, 44 - 40127 Bologna
> Tel: +39 051 3782611
> Fax: +39 051 3782655
> 
> 
> <GradsPlot.png>_______________________________________________
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--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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