[gradsusr] netCDF control file

[Heiner Körnich]

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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> gradsusr at gradsusr.org
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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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