[gradsusr] netCDF control file

Mon Nov 8 10:25:41 EST 2010

Hello Heiner, 

Thank you for your mail. I tried 'sdfopen  <http://ures.nc> ures.nc'  but
neither grads 2.0 nor grads 1.8 recognized sdfopen. Then I  prepared a
control file as below, by looking at the “CDO sinfo ures.nc”.  Then tried
“xdfopen ures.ctl” but none of the grads versions recognized xdfopen again. 

*

DSET  ^ures.nc

DTYPE  netcdf

UNDEF  -9e+33

XDEF dimension1  96 LINEAR 0.000000 3.750000

YDEF dimension2  48 LEVELS -87.159 -83.479 -79.777 -76.070 -72.362 -68.652 

               -64.942 -61.232 -57.521 -53.810 -50.099 -46.389 

               -42.678 -38.967 -35.256 -31.545 -27.833 -24.122 

               -20.411 -16.700 -12.989  -9.278  -5.567  -1.856 

                 1.856   5.567   9.278  12.989  16.700  20.411 

                24.122  27.833  31.545  35.256  38.967  42.678 

                46.389  50.099  53.810  57.521  61.232  64.942 

                68.652  72.362  76.070  79.777  83.479  87.159 

ZDEF dimension3  114 LINEAR 1 1

TDEF dimension4  1 LINEAR 00:00Z00jan0000 1mn

TITLE  ures.grb  T31 grid

VARS  1

ures             114  1,100  ures

ENDVARS

*

My data is three dimensionaI and if I try to save my data in an ASCII file
in MATLAB it gives a two dimensional output. I also couldn’t solve this
problem

Thank you

Deniz 

Von: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] Im
Auftrag von Heiner Körnich
Gesendet: Montag, 8. November 2010 14:06
An: GrADS Users Forum
Betreff: Re: [gradsusr] netCDF control file

Hi Deniz,

you don't nead a ctl-file to open a netcdf-file in grads. If your file
follows the COARDS-standard, then you can open it with 'sdfopen ures.nc'. If
grads won't recognise it, you might want to try an older grads-version. We
had some problems here with grads 2.0 and netcdf.

If grads still won't open your file, you can write a ctl-file and try to
open that with the command 'xdfopen'. The ctl-file looks a bit different
from standard ctl-files, look here:
http://www.iges.org/grads/gadoc/gradcomdxdfopen.html

Then, you would need the output from ncdump in order to know what is inside
the netcdf-file. Alternatively you can use the climate data operators (CDO)
with the command "cdo sinfo ures.nc".
Or in matlab, if you have the mexnc-package installed, you read the
information with 
info=nc_info('ures.nc')
Then you can access all details in info.

Finally, if it is only you who will use the data, it might be simpler to
write binary output in matlab and use a standard ctl.

Kind regards from Stockholm,
Heiner

On Mon, Nov 8, 2010 at 10:11 AM, Deniz Demirhan Bari <bari at iap-kborn.de>
wrote:

Dear Grads users, 

I have calculated residual wind components in MATLAB and saved them in
netCDF file. Now I want to read them in grads but I cannot create a netcdf
control file.

I tried to get the output of ncdump but my computer doesn’t recognize ncdump
although I installed it. 
I am using the latest version of Grads on a Suse Linux computer. 
My attempt to create a ctl file is below: 

*

DSET  ^ures.nc

DTYPE  netCDF

XDEF 96 LINEAR 0.000000 3.750000

YDEF 48 LEVELS -87.159 -83.479 -79.777 -76.070 -72.362 -68.652

               -64.942 -61.232 -57.521 -53.810 -50.099 -46.389

               -42.678 -38.967 -35.256 -31.545 -27.833 -24.122

               -20.411 -16.700 -12.989  -9.278  -5.567  -1.856

                 1.856   5.567   9.278  12.989  16.700  20.411

                24.122  27.833  31.545  35.256  38.967  42.678

                46.389  50.099  53.810  57.521  61.232  64.942

                68.652  72.362  76.070  79.777  83.479  87.159

ZDEF 114 LINEAR 1 1

TDEF 1 LINEAR 00:00Z00jan0000 1mn

OPTIONS yrev

UNDEF  -9e+33

VARS  1

ures             114  1,100  ures

ENDVARS

* 

Thanks in advance

Deniz DEMIRHAN BARI

Leibniz-Institut für Atmosphärenphysik e.V.
an der Universität Rostock
Schlossstraße 6
18225 Kühlungsborn

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-- 
Heiner Körnich    
Dept. of Meteorology            Tel:  +46 8 164333
Stockholms University, SE-106 91 Stockholm, Sweden
Email: heiner at misu.su.se   www.misu.su.se/~heiner/

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