[gradsusr] Multiple netcdf files in one control file

[Malleswararao Maguluri]

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>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
>  cru_ts3.21.1981.1990.tmp.dat.nc
>  cru_ts3.21.1991.2000.tmp.dat.nc
>  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
>
>   Binary: cru_ts3.21.1971.1980.tmp.dat.nc
>
>   Type = Gridded
>
>   Xsize = 720  Ysize = 360  Zsize = 1  Tsize = 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;
>
> DSET  cru_ts3.21.%x31.%x30.tmp.dat.nc
>
> OPTIONS template
>
> DTYPE netcdf
>
> XDEF 720 linear -89.75 89.75
>
> YDEF 360 linear 0 360
>
> ZDEF   1 linear 1000
>
> TDEF 480 linear jan1971 1mo
>
> vars 1
>
> tmp 0  99 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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