[gradsusr] Multiple netcdf files in one control file

[James T. Potemra]

Mehwish,

I think the problem is your file names contain different decades, so in 
your .ctl file where you have:

DSET  cru_ts3.21.%x31.%x30.tmp.dat.nc

the %x3 will be the same.  For example, the first time through the 
substitution will be 197, or

DSET cru_ts3.21.1971.1970.tmp.dat.nc

One way around this would be to instead use chsub:

DSET ^cru_ts3.21.%ch.tmp.dat.nc
CHSUB     1  120 1971.1980
CHSUB 121  240 1981.1990
CHSUB 241  360 1991.2000
OPTIONS template
DTYPE netcdf

More details at http://www.iges.org/grads/gadoc/templates.html

Jim

On 5/11/14 9:02 PM, Malleswararao Maguluri wrote:
> Hi,
>
>    Better to use cdo for calculating climatology. otherwise you can 
> combine your decadal files as a single file using cat command in cdo 
> and use it as input to grads.
>
> Thanks & regards,
>
>
> On Mon, May 12, 2014 at 12:18 PM, mehwish ramzan 
> <mehwish.ramzan at gmail.com <mailto:mehwish.ramzan at gmail.com>> wrote:
>
>     Dear GrADS community,
>
>     I am trying to merge multiple netcdf files into one control file
>     so that i can calculate the climatology of 25 years. The data is
>     available in decadal format like this;
>
>     cru_ts3.21.1971.1980.tmp.dat.nc
>     <http://cru_ts3.21.1971.1980.tmp.dat.nc>
>     cru_ts3.21.1981.1990.tmp.dat.nc
>     <http://cru_ts3.21.1981.1990.tmp.dat.nc>
>     cru_ts3.21.1991.2000.tmp.dat.nc
>     <http://cru_ts3.21.1991.2000.tmp.dat.nc>
>     cru_ts3.21.1991.2000.tmp.dat.nc
>     <http://cru_ts3.21.1991.2000.tmp.dat.nc>
>
>     while the information of one .nc file is as;
>
>     File 1 : CRU TS3.21 Mean Temperature
>
>     Descriptor: cru_ts3.21.1971.1980.tmp.dat.nc
>     <http://cru_ts3.21.1971.1980.tmp.dat.nc>
>
>     Binary: cru_ts3.21.1971.1980.tmp.dat.nc
>     <http://cru_ts3.21.1971.1980.tmp.dat.nc>
>
>     Type = Gridded
>
>     Xsize = 720Ysize = 360Zsize = 1Tsize = 120
>
>     Number of Variables = 1
>
>     tmp 0 -999 near-surface temperature
>
>     By following some previous posts regarding same issue, according
>     to my understanding i prepared one ctl file which can be used as a
>     combination of above four separate files. The .ctl file is as follows;
>
>     DSETcru_ts3.21.%x31.%x30.tmp.dat.nc <http://x30.tmp.dat.nc>
>
>     OPTIONS template
>
>     DTYPE netcdf
>
>     XDEF 720 linear -89.75 89.75
>
>     YDEF 360 linear 0 360
>
>     ZDEF1 linear 1000
>
>     TDEF 480 linear jan1971 1mo
>
>     vars 1
>
>     tmp 099 near-surface temperature
>
>     endvars
>
>
>     But when i tried to open this control file. It give error message;
>
>     Invalid variable record
>
>     --> The invalid description file record is:
>
>     --> tmp 0 -999 near-surface temperature
>
>     The data file was not opened.
>
>     I know i am making mistake in preparing ctl file but i don't know
>     how to put right information ?
>
>     Please help me in solving this issue.
>
>
>     Thank You
>
>
>     With Best Regards,
>
>
>     Mehwish
>
>
>
>
>
>
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>
>
>
>
> -- 
> M. MALLESWARA RAO
> M.Tech (Atmospheric Science) & M.Sc (Physics)
>
>
>
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