[gradsusr] How to set time attribute in sdfwrite

[Zablone Owiti]

Dear Charles,
Thanks for the explanation and the earlier emails. I wrote a .ctl file(see bellow) to read the original data (via xdfopen command), but I get the following error (on the z dimension) which I have failed to figure out how to correct :  
 Scanning Descriptor File:  gcpcr.ctl
gadsdf: Lev dimension z is not an SDF dimension.
SDF Descriptor file gcpcr.ctl was not successfully opened & parsed.

The gcpcr.ctl is: 
dset ^gcpcr.nc
dtype netcdf
title Test File
undef 1e+20
xdef longitude 360 linear 0.5 1.0
ydef latitude 180 linear -89.5 1.0
zdef z 1 levels 0
tdef t 674 linear 0Z1jan1948 1mo
vars 1
r=>r 1 99 Precipitation (mm/day)
endvars
Further, the q dims results for the original data file (gcpcr.nc) when opened with sdfopen command  are:

Default file number is: 1
X is varying   Lon = 0 to 360   X = 0.5 to 360.5
Y is varying   Lat = -89.5 to 89.5   Y = 1 to 180
Z is fixed     Lev = 0  Z = 1
T is fixed     Time = 00Z01JAN1948  T = 1
E is fixed     Ens = 1  E = 1

Thanks 
===================================================
ZABLONE OWITI
GRADUATE STUDENT
Nanjing University of Information, Science and Technology
College of International Education
Add: 219 Ning Liu Rd, Nanjing, Jiangsu, 21004, P.R. China
Tel: +86-25-58731402
Fax: +86-25-58731456
Mob. 15077895632
Website: www.nuist.edu.cn
====================================================
"The real art of conversation is not only to say the right thing at the right time, but also to leave unsaid the wrong thing at the tempting moment."
 



From: Charles Seman <Charles.Seman at noaa.gov>
To: Zablone Owiti <zablonowiti at yahoo.com>; GrADS Users Forum <gradsusr at gradsusr.org>
Cc: 
Sent: Wednesday, 19 January 2011 1:29 AM
Subject: Re: [gradsusr] How to set time attribute in sdfwrite

Zablone,

I'll forward a couple of emails from Jennifer Adams who helped me put a time axis on a GrADS sdfwrite netCDF output file (the input netCDF file had no Z or T dimension...).  In essence, the solution involved defining a data descriptor file to open the input netCDF file to define the time axis... I'm not sure what your input dataset attributes look like, so I'm guessing here...  If you have questions or want sample code from a script, feel free to email me.

Hope this helps,
Chuck

Zablone Owiti wrote:
> Dear users,
> 
> I am writting out monthly data from a .nc file using the sdfwrite command. When I open the data I get the following warning:
> *SDF file has no discernable time coordinate -- using default values.
> *and when I q dims  Time = 00z01Jan001 instead of the time for the data extracted i.e  00z01Jul1960. How can I use the *sdfattr* command to force the time attribute. Below is the script I am using to extract the data:
> 'reinit'
> 'sdfopen gcpcr.nc'
> 'set x 0.5 360.5'
> 'set y 1 180'
> 'set time 00z01jul1960'
> 'set sdfwrite r1.nc'
> 'define pcp=r'
> 'sdfwrite pcp'
> 'clear sdfwrite'
> 
> Thanks
> */===================================================/*
> */ZABLONE OWITI
> GRADUATE STUDENT
> Nanjing University of Information, Science and Technology
> College of International Education
> Add: 219 Ning Liu Rd, Nanjing, Jiangsu, 21004, P.R. China
> /*Tel: +86-25-58731402
> Fax: +86-25-58731456
> */Mob. 15077895632/*
> */Website: www.nuist.edu.cn <http://www.nuist.edu.cn/>
> /*/*====================================================
> *
> /"The real art of conversation is not only to say the right thing at the right time, but also to leave unsaid the wrong thing at the tempting moment."///
>  /
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>  

-- 
Please note that Charles.Seman at noaa.gov should be considered my NOAA
email address, not cjs at gfdl.noaa.gov.

********************************************************************
Charles Seman                                Charles.Seman at noaa.gov
U.S. Department of Commerce / NOAA / OAR
Geophysical Fluid Dynamics Laboratory        voice: (609) 452-6547
201 Forrestal Road                              fax: (609) 987-5063
Princeton, NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/
********************************************************************

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