Re: [ferret_users] Transform 4D to 3D datasets

[Sudheer Joseph <sjo.india@xxxxxxxxx>]

Hi,
           For changing a given grid to new grid, in general the below
method can be used,
define the target grid as below or use required dimensions from
existing variable...

def axis/x= ...... xax
def axis/y=........yax
def axis/z=........zax
def axis/t=.........tax
let ngrid = x[gx=xax] + y[gt=yax] + z[gz=zax] + t[gt=tax]
let new_var= reshape (old_var, ngrid)
here ngrid can be according to your requirement
for example
let ngrid= x[gx=xax] + y[gy=yax]
or
let ngrid= x[gx=xax] + y[gy=yax] + t[gt=tax]
or any combination
in given instance
the ngrid can be
let ngrid = x[gx=uwnd] + g[gy=uwnd]
let new_u= reshape(uwind,ngrid)
hope this helps..

with best regards,
Sudheer

On Mon, Sep 17, 2012 at 12:59 AM, Verena Lili <verena.prick@xxxxxxxxx> wrote:
> Hi,
>
> I did, but still get the same dimensions 4D,
> Finally it works when i'm using NCO command.
>
> Thanks a lot ;)
>
>
>
> On Sun, Sep 16, 2012 at 9:10 PM, Júnior <juniorphy@xxxxxxxxx> wrote:
>>
>> Hi Verena,
>>
>> You can save 200 hPa U in new netcdf file, like this:
>> Assuming that U at 200 hPa is equal to k=1
>>
>> save/file=u200.nc u[k=1]
>>
>> Then, the new file u200.nc is 3D.
>>
>> Bests,
>>
>> Júnior
>>
>>
>> On Sun, Sep 16, 2012 at 3:29 PM, Verena Lili <verena.prick@xxxxxxxxx>
>> wrote:
>>>
>>> Hi Ferret users,
>>>
>>> I just wonder is there any possible way to change the dimension in my
>>> data from 4D to 3D,
>>> let say i have zonal wind data only at level 200 hPa thus U [time x lev x
>>> lat x lon] and i want to remove
>>> the level dimension inside thus later i just have U [time x lat x lon].
>>> Since it only consist of 1 level, i don't need "level" dimension inside my
>>> data.
>>>
>>> Thanks for your help.
>>>
>>
>>
>>
>> --
>> ------------------------------------------------------------
>> Francisco das Chagas Vasconcelos Júnior
>> Doutorando em Ciências Atmosféricas
>> Grupo de Estudos em Multiescalas - GEM
>> Universidade de São Paulo - USP
>> Instituto de Astronomia, Geofísica e Ciências Atmosféricas - IAG
>>
>



-- 
with best regards

Sudheer

**********************************************************************************
Dr. Sudheer Joseph
Scientist
INDIAN NATIONAL CENTRE FOR OCEAN INFORMATION SERVICES (INCOIS)
MINISTRY OF EARTH SCIENCES, GOVERNMENT OF INDIA
"OCEAN VALLEY" PRAGATHI NAGAR (BO)
OPP.JNTU, NIZAMPET SO
Andhra Pradesh, India. PIN- 500 090.
TEl:+91-40-23044600(R),Tel:+91-9440832534(Mobile)
Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
E-mail: sudheer.joseph@xxxxxxxxx;  sjo@xxxxxxxxxxxxx.
Web- http://oppamthadathil.tripod.com
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