Fwd: how to handle varying variable name in list of grib files

Dear Gibies,

Thats awesome, it worked. This will be great help to other new ncl users as
well.

Thanks again

Samir

On Tue, Jul 23, 2013 at 11:15 AM, gibies george <gibies@tropmet.res.in>wrote:

> Samirji,
>
> Time unit can be the same as
>
> time@units = "hours since 2013-01-01 00:00:00"
>
> and time array can be given explicitly as
>
> time=(/3,6,9,12,15,18,21,24,
> 30,36,42,48, 54,60,66,72, 78,84,90,96, 102,108,114,120,
> 132,144,156,168
> 192,216/)
>
> Am I right Dr David Brown ?
>
>
> On 23 July 2013 10:58, samir pokhrel <samir@tropmet.res.in> wrote:
>
>> Hi David,
>>
>> As you know that my files has 25 time step (first 3 hour, then 6 hour
>> then 12 hour and lastly 24 hour). In general whenever we assign time it has
>> fixed interval (viz. hourly or daily or monthly and so on) so in that case
>> we can easily assign time units (e.g for hourly data) by
>>
>> time@units = "hours since 2013-01-01 00:00:00"
>>
>> On the similar line how can we assign hour units of 3hr, 6hr, 12hr and 24
>> hr together in a variable, so that the variable first 8 record should have
>> 3 hour interval, next 16 record should have 6 hour interval, next 4 record
>> should have 12 hour interval and lastly 2 record should have 24 hour
>> interval.
>>
>> I hope now I am clear.
>>
>> Thanking you
>>
>> Samir
>>
>>
>>
>> On Tue, Jul 23, 2013 at 1:10 AM, David Brown <dbrown@ucar.edu> wrote:
>>
>>> Hi Samir,
>>> I am not sure I understand the question about irregular time intervals.
>>> Can you give an example of what you need to do specifically?
>>> -dave
>>>
>>> On Jul 21, 2013, at 11:54 PM, samir pokhrel <samir@tropmet.res.in>
>>> wrote:
>>>
>>>
>>>
>>> ---------- Forwarded message ----------
>>> From: samir pokhrel <pokhrelsamir@gmail.com>
>>> Date: Mon, Jul 22, 2013 at 11:22 AM
>>> Subject: Re: how to handle varying variable name in list of
>>> grib files
>>> To: David Brown <dbrown@ucar.edu>
>>> Cc: ncl-talk@ucar.edu, "Sabeerali C. T." <sabeer@tropmet.res.in>, Rajib
>>> Chattopadhyay <rajib@tropmet.res.in>, "M.Mahakur" <
>>> mmahakur@tropmet.res.in>, "Mukho.Parthasarthy" <mpartha@tropmet.res.in>
>>>
>>>
>>> Thats Great David,
>>>
>>> Its working fine. Thanks a lot for your such a efficient solution.
>>> Regarding my second query do you have any idea to assign time with
>>> irregular intervals?
>>>
>>> Thanks again
>>>
>>> Samir
>>>
>>>
>>> On Fri, Jul 19, 2013 at 11:46 PM, David Brown <dbrown@ucar.edu> wrote:
>>>
>>>> Hi Samir,
>>>> There is a setfileoption that allows you to strip off the time period
>>>> suffixes and treat these variables as the same. It is a True/False logical
>>>> type option called TimePeriodSuffix.
>>>>
>>>> setfileoption("grb","TimePeriodSuffix",False)
>>>>
>>>> will cause all these variable names to be shortened
>>>> to "PRATE_4_SFC_ave", allowing them to be concatenated into a single
>>>> variable using addfiles. The forecast_time dimension should then contain
>>>> the varying intervals starting from the initial time for each element. Of
>>>> course it will be up to you to decide how to deal with the varying length
>>>> of the averaging period.
>>>> -dave
>>>>
>>>>
>>>> On Jul 19, 2013, at 5:57 AM, samir pokhrel <samir@tropmet.res.in>
>>>> wrote:
>>>>
>>>> Dear NCL users,
>>>>
>>>> I have a series of daily forecast (in grib2 format) from GFS T574 of
>>>> varying hours
>>>>
>>>> the first day forcast has 3 hour intervals (6 files)
>>>> the 2nd to 5th day forecast has 6 hour intervals (4 files each day for
>>>> 4 days = total 16 files)
>>>> the 6th day forecast has 12 hour intervals (i.e 2 files)
>>>> and the 7th (last) day forecast has 24 hour interval (i.e 1 file)
>>>>
>>>> so total I have 25 forecast file of one day
>>>>
>>>> I am reading all this file together using addfiles and also adding the
>>>> extra time dimension using setfileoption
>>>>
>>>> it is working fine with all other variable (viz. wind, temp etc),
>>>> however in case of precipitaion the variable name varies in each file so I
>>>> am not able to retrieve it
>>>>
>>>> Now I am having following two queries on these data
>>>>
>>>> First Query
>>>>
>>>> 1) How to handle same variable with different name in different files
>>>> so I can club them all together for further analysis
>>>>
>>>> File Name Variable Name
>>>> gfs.t00z.pgrbf03.grb PRATE_4_SFC_ave3h
>>>> gfs.t00z.pgrbf06.grb PRATE_4_SFC_ave6h
>>>> gfs.t00z.pgrbf09.grb PRATE_4_SFC_ave9h
>>>> gfs.t00z.pgrbf12.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf18.grb PRATE_4_SFC_ave18h
>>>> gfs.t00z.pgrbf24.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf30.grb PRATE_4_SFC_ave6h
>>>> gfs.t00z.pgrbf36.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf42.grb PRATE_4_SFC_ave18h
>>>> gfs.t00z.pgrbf48.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf54.grb PRATE_4_SFC_ave6h
>>>> gfs.t00z.pgrbf60.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf66.grb PRATE_4_SFC_ave18h
>>>> gfs.t00z.pgrbf72.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf78.grb PRATE_4_SFC_ave6h
>>>> gfs.t00z.pgrbf84.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf90.grb PRATE_4_SFC_ave18h
>>>> gfs.t00z.pgrbf96.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf102.grb PRATE_4_SFC_ave6h
>>>> gfs.t00z.pgrbf108.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf114.grb PRATE_4_SFC_ave18h
>>>> gfs.t00z.pgrbf120.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf132.grb PRATE_4_SFC_ave12h
>>>> gfs.t00z.pgrbf144.grb PRATE_4_SFC_ave24h
>>>> gfs.t00z.pgrbf168.grb PRATE_4_SFC_ave24h
>>>>
>>>>
>>>> Second Query
>>>>
>>>> 2) How to put time value of irregular interval in the clubbed variable
>>>> of all 25 files together
>>>>
>>>> Hope I am clear enough to make you all understand the issues.
>>>>
>>>> Thanks you all in advance.
>>>>
>>>> Regards
>>>>
>>>> Samir Pokhrel
>>>> Climate and Global Modelling Division
>>>> Indian Institute of Tropical Meteorology
>>>> NCL Post, Pashan
>>>> Pune-411008
>>>> INDIA _______________________________________________
>>>> ncl-talk mailing list
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>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Samir Pokhrel
>>> Climate and Global Modelling Division
>>> Indian Institute of Tropical Meteorology
>>> NCL Post, Pashan
>>> Pune-411008
>>> INDIA
>>>
>>> --
>>> Samir Pokhrel
>>> Climate and Global Modelling Division
>>> Indian Institute of Tropical Meteorology
>>> NCL Post, Pashan
>>> Pune-411008
>>> INDIA
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>> --
>>> Samir Pokhrel
>>> Climate and Global Modelling Division
>>> Indian Institute of Tropical Meteorology
>>> NCL Post, Pashan
>>> Pune-411008
>>> INDIA <http://mailman.ucar.edu/mailman/listinfo/ncl-talk>
>>>
>>>
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>
>
> --
> *Gibies George,
> CSIR-Senior Research Fellow,*
> *Program for Model development and seasonal prediction,
> Climate and Global Modelling Division,
> Indian Institute of Tropical Meteorology,
> Dr. Homi Bhabha Road,
> NCL (P. O.), Pashan,
> Pune 411008, India.
> Tel. Off. +912025904423*
> *Mobile : +919028523910
> +919881707796
> *
>
> *http://sites.google.com/site/gibiesge/*
>
>
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>
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>
>

-- 
Samir Pokhrel
Climate and Global Modelling Division
Indian Institute of Tropical Meteorology
NCL Post, Pashan
Pune-411008
INDIA
-- 
Samir Pokhrel
Climate and Global Modelling Division
Indian Institute of Tropical Meteorology
NCL Post, Pashan
Pune-411008
INDIA

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Received on Tue Jul 23 00:15:34 2013