[gradsusr] netCDF control file
Deniz Demirhan Bari
bari at iap-kborn.de
Tue Nov 9 07:37:29 EST 2010
Dear Heiner,
Grads 2.0 in our server is now changed and it is compiled with netCDF
support.
When I tried:
>sdfopen ures.nc
it says:
>Scanning self-describing file: ures.nc
gadsdf: SDF file has no discernable X coordinate.
When I try:
>xdfopen ures.ctl
>Scanning Descriptor File: ures.ctl
gadsdf: Lon dimension dimension1 is not an SDF dimension.
SDF Descriptor file ures.ctl was not successfully opened & parsed.
---Matlab fwrite, I tried it but couldn’t manage.
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 17:07
An: GrADS Users Forum
Betreff: Re: [gradsusr] netCDF control file
Hi Deniz,
when you write recognized "sdfopen" or "xdfopen", do you mean that grads
does not know the command? Is your grads-version compiled with
netcdf-support?
It is certainly a good thing to create netcdf-files, as they are
self-descriptive. But still you could write binary data from matlab with the
command fwrite:
http://www.mathworks.com/help/techdoc/ref/fwrite.html
Then you have to follow the logic of grads binary files, ie. first
longitude, then latitude, then height, then time, as described in the
manual.
So far,
Heiner
On Mon, Nov 8, 2010 at 4:25 PM, Deniz Demirhan Bari <bari at iap-kborn.de>
wrote:
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/
<http://www.misu.su.se/%7Eheiner/>
_______________________________________________
gradsusr mailing list
gradsusr at gradsusr.org
http://gradsusr.org/mailman/listinfo/gradsusr
--
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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