[gradsusr] extracting problem

[Kishore Ragi]

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: +91-8908671881http://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 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
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
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>>
>
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