[gradsusr] extracting problem

Tue Aug 29 09:36:53 EDT 2017

Thanks.I want to plot seasonal climatology.

Sanjukta Rani Padhi
Junior Research Fellow(DST INSPIRE)
Dept. of Marine Sciences
Berhampur University
Bhanja Bihar-760007
Berhampur, Odisha
Ph. No.-7381539663

On Tue, Aug 29, 2017 at 6:46 PM, Kishore Ragi <kishoreragi at gmail.com> wrote:

> Please be clear about what you want to plot. You mean DJF seasonal mean?
> If you want for one year, you may go like below
>
> d (var(t=1)+var(t=2)+var(t=12))/3
>
> Regards,
> Kishore
>
>
> *PhD student in climate science,*
>
> *National Institute of Technology, Rourkela,*
>
> *India- 769008*
>
>
>
>
>
> *Phone: +91-8908671881http://www.researchgate.net/profile/Kishore_Ragi
> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
> <https://in.linkedin.com/in/kishoreragi>*
>
> On Tue, Aug 29, 2017 at 6:34 PM, Sanjukta Rani Padhi <
> sanjuktapadhi87 at gmail.com> wrote:
>
>> can I know the codes  to plot a DJF  (december, january, february) from a
>> .nc file. thanks.
>>
>> On Tue, Aug 29, 2017 at 6:32 PM, Sanjukta Rani Padhi <
>> sanjuktapadhi87 at gmail.com> wrote:
>>
>>> yes it help. thank you sir.
>>>
>>>
>>> On Tue, Aug 29, 2017 at 6:07 PM, Kishore Ragi <kishoreragi at gmail.com>
>>> wrote:
>>>
>>>> Technically, there is no difference between cdo and grads to extract.
>>>> Output should be same!
>>>>
>>>> However, you can get separated files for each year with grads. You only
>>>> have to select x and y for each year that you want.
>>>>
>>>> Then you can combine the separated years using cdo as the following
>>>>
>>>> cdo mergetime file1.nc file2.nc file3.nc all.nc
>>>>
>>>> But, I prefer using cdo command.
>>>>
>>>> cdo selyear,2002,2004,2007 2000-2013.nc 200220042007.nc
>>>>
>>>> hope this helps!
>>>>
>>>> Regards,
>>>> Kishore
>>>>
>>>>
>>>> *PhD student in climate science,*
>>>>
>>>> *National Institute of Technology, Rourkela,*
>>>>
>>>> *India- 769008*
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *Phone: +91-8908671881
>>>> <+91%2089086%2071881>http://www.researchgate.net/profile/Kishore_Ragi
>>>> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
>>>> <https://in.linkedin.com/in/kishoreragi>*
>>>>
>>>> On Tue, Aug 29, 2017 at 5:55 PM, Sanjukta Rani Padhi <
>>>> sanjuktapadhi87 at gmail.com> wrote:
>>>>
>>>>> Thanks sir for the commands. In CDO the ploting map is not clear ,
>>>>> thats why i prefer to use Grads.
>>>>> but if my years are not serialy means x to y is not serial, then how i
>>>>> set.
>>>>> if i want 2002, 2004, 2007 from 2000-2013.nc data set. kindly help.
>>>>>
>>>>>
>>>>> On Tue, Aug 29, 2017 at 5:42 PM, Kishore Ragi <kishoreragi at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> You can use cdo to extract data from th large file.
>>>>>>
>>>>>> use the following command
>>>>>>
>>>>>> cdo selyear,2010,2011,2012,etc inputfile.nc outfile.nc
>>>>>>
>>>>>> or if you want to stick to grads and want to extract few years, here
>>>>>> are the steps you should take
>>>>>>
>>>>>> sdfopen yourfile.nc
>>>>>> set t x y
>>>>>> define var=var
>>>>>> set sdfwrite subset.nc
>>>>>> sdfwrite var
>>>>>>
>>>>>> where x and y are initial and final timestep you want in your
>>>>>> required subset file.
>>>>>>
>>>>>> This clearly shows that the former process is much easier. If I were
>>>>>> you, I would use cdo to accomplish as I am bit lazy.
>>>>>>
>>>>>> Cheers,
>>>>>> Kishore
>>>>>>
>>>>>>
>>>>>> *PhD student in climate science,*
>>>>>>
>>>>>> *National Institute of Technology, Rourkela,*
>>>>>>
>>>>>> *India- 769008*
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> *Phone: +91-8908671881
>>>>>> <+91%2089086%2071881>http://www.researchgate.net/profile/Kishore_Ragi
>>>>>> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
>>>>>> <https://in.linkedin.com/in/kishoreragi>*
>>>>>>
>>>>>> On Tue, Aug 29, 2017 at 5:24 PM, Sanjukta Rani Padhi <
>>>>>> sanjuktapadhi87 at gmail.com> wrote:
>>>>>>
>>>>>>> Hi All,
>>>>>>> I am new in Grads. I want to know how to extract some years from a
>>>>>>> .nc file having some large no of years.
>>>>>>> thanks
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>>
>>>>>>
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>>>>>>
>>>>>
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