[gradsusr] write in netcdf format

Mon Nov 25 04:26:58 EST 2019

thanks..
i guess you have written both in same shapes..
but i do not understand why two in these two lines you sent in this email looks different...
t2 0 ....

meaning t2 just one level...

you may check both nc files using ncdump utility..

----- Original Message -----
From: lpasmanoranjan <lpasmanoranjan at gmail.com>
To: GrADS Users Forum <gradsusr at gradsusr.org>
Sent: Mon, 25 Nov 2019 09:48:16 +0530 (IST)
Subject: Re: [gradsusr] write in netcdf format

Dear Mahakur
You solved my problem. Thank you once again.

Still one small doubt. I used “cdo merge u.nc t2.nc out.nc”

After opening out.nc in grads, “q file” command shows:
u   11  t,z,y,x  u
t2   0  t,y,x     t2

Here t2 has only one level. Let’s say 1000. But t2 is showing same values
at all 11 levels. I should show undefined values at other 10 levels.

Do you have any comment on this?

Mano

On Mon, Nov 25, 2019 at 11:49 M.Mahakur <mmahakur at tropmet.res.in> wrote:

>
>
> not possible with grads.. each variables' netcdf you can later merge using
> cdo..
>
> ----- Original Message -----
> From: lpasmanoranjan <lpasmanoranjan at gmail.com>
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Sent: Mon, 25 Nov 2019 07:05:37 +0530 (IST)
> Subject: Re: [gradsusr] write in netcdf format
>
> Hello Mahakur,
> Many thanks. It worked perfectly fine. I have one more question. Can’t I
> extend it to more than one variable, e.g. u, v, t2 in one netcdf file?
>
> Mano
>
> On Sat, Nov 23, 2019 at 16:37 M.Mahakur <mmahakur at tropmet.res.in> wrote:
>
> > You can set sdfwrite with option -3dz, if your grads is 2.1.a2+
> > Please see the online doc, I have pasted the relevant lines here..
> >
> >
> > The -3dz,-3dt,-rt and -re options are available in version 2.1.a2+.
> >
> > set sdfwrite <-3dz or -3dt or -4d or -5d> <-rt or -re> <-flt or -dbl>
> > <-nc3 or -nc4> <-chunk> <-zip> *fname*
> >
> > where
> >
> > *fname*    output filename (required)
> >
> > The following six optional arguments are not enabled by default; each new
> > call to set sdfwrite
> > <http://cola.gmu.edu/grads/gadoc/gradcomdsetsdfwrite.html> will turn
> them
> > off if they are not included. The default behavior is to write out a
> > variable with the same number of varying dimensions as the defined
> variable
> > and with no record (unlimited) dimension.
> > -3dt
> >
> >    forces the output data file to have at least 3 coordinate dimensions
> >       (lon, lat, and time)
> >
> >
> > -3dz
> >
> >    forces the output data file to have at least 3 coordinate dimensions
> >       (lon, lat, and lev)
> >
> >
> > -4d
> >
> >    forces the output data file to have at least 4 coordinate dimensions
> >       (lon, lat, lev, and time)
> >
> >
> > -4e
> >
> >    forces the output data file to have at least 4 coordinate dimensions
> >       (lon, lat, time, and ens)
> >
> >
> > -5d
> >
> >    forces the output data file to have 5 coordinate dimensions (lon, lat,
> >       lev, time, and ens)
> >
> >
> > -rt
> >
> >    sets the T axis as the record (unlimited) dimension
> >
> >
> > -re
> >
> >    sets the E axis as the record (unlimited) dimension
> >
> >
> > ------------------------------
> > *From: *"lpasmanoranjan" <lpasmanoranjan at gmail.com>
> > *To: *"GrADS Users Forum" <gradsusr at gradsusr.org>
> > *Sent: *Saturday, November 23, 2019 11:49:48 AM
> >
> > *Subject: *Re: [gradsusr] write in netcdf format
> >
> > Dear Jha and Dash,
> > CDO does not work!! I am getting the following error:
> >
> > $> cdo -f nc import_binary data.ctl data.nc
> > Open Error: Unknown keyword in description file
> > --> The invalid description file record is:
> > --> pdef 38 28 lcc 46.00 5.00 19.00 14.00 30.00 60.00 5.00 60000. 60000.
> > The data file was not opened.
> > cdo import_binary (Abort): Open failed!
> >
> >
> > Dear Mahakud,
> > As per your suggestion, I can save only one variable at one level with x
> > and y varying. How about varying the Z-dimension?
> >
> > Thank you Jha, Dash and Mahakur for your prompt suggestions.
> >
> >
> > On Sat, 23 Nov 2019 at 15:02, M.Mahakur <mmahakur at tropmet.res.in> wrote:
> >
> >> replace newvars=vars
> >> with
> >> newvars=u (for example)
> >>
> >> you can write only one variable in a single netCDF.
> >>
> >> ------------------------------
> >> *From: *"Itesh Dash" <itesh.dash at gmail.com>
> >> *To: *"GrADS Users Forum" <gradsusr at gradsusr.org>
> >> *Sent: *Saturday, November 23, 2019 10:58:53 AM
> >> *Subject: *Re: [gradsusr] write in netcdf format
> >>
> >> Use cdo to convert. Simple and easy. Follow the link below.
> >>
> >> https://code.mpimet.mpg.de/boards/1/topics/213
> >>
> >>
> >>
> >>
> >> On Sat, Nov 23, 2019, 11:02 AM lpasmanoranjan <lpasmanoranjan at gmail.com
> >
> >> wrote:
> >>
> >>> Dear Users,
> >>> I have a dataset (.DAT format with a .ctl file). I would like to write
> >>> it in netcdf format. My dataset have multiple variables with various
> level.
> >>> Following are the details in my .ctl file:
> >>>
> >>> xdef  100 linear 55   0.2
> >>> ydef  200 linear 60   0.2
> >>> zdef   11 levels 1000 925 900 850 700 500 300 200 150 100 50
> >>> tdef  120 linear 00Z15May2012     1hr
> >>> VARS   5
> >>> U             11 0  x-wind component (m s-1)
> >>> V             11 0  y-wind component (m s-1)
> >>> W             11  0  z-wind component (m s-1)
> >>> Q2             1  0  QV at 2 M (kg kg-1)
> >>> T2             1  0  TEMP at 2 M (K)
> >>> My grads script to write my data in netcdf format is:
> >>>
> >>> 'open data.ctl'
> >>> 'set time 00z15May2012 23z20May2012'
> >>> 'set gxout fwrite'
> >>> 'define newvars=vars'
> >>> 'set sdfwrite data.nc'
> >>> 'sdfwrite newvars
> >>> 'quit'
> >>>
> >>> This script is not working.
> >>> Any help please??
> >>>
> >>> Thank you in advance.
> >>> Kind Regards,
> >>> Mano
> >>> _______________________________________________
> >>> gradsusr mailing list
> >>> gradsusr at gradsusr.org
> >>> http://gradsusr.org/mailman/listinfo/gradsusr
> >>>
> >>
> >> _______________________________________________
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> >> _______________________________________________
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> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >>
> >
> >
> > --
> > Kind Regards,
> > Mano
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> > _______________________________________________
> > gradsusr mailing list
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> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> --
> Kind Regards,
> Mano
>
>
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>
-- 
Kind Regards,
Mano