[gradsusr] error when opening a ctl file

[Jayakrishnan P.R]

You may try this.
1) Convert the already existing ERAI_1979.nc to grib using CDO as
cdo -f grb copy ERAI_1979.nc ERAI1979.grb

2) Create a ctl file for the grib file using

cdo gradsdes2 ERA_1979.grb

3) Open the grib file created from nc file using the CDO created ctl file.

Just a suggestion.




Sincerely
***********************************************
Dr. Jayakrishnan.P.R
Project Scientist-C
National Centre for Medium Range Weather Forecasting
Earth System Science Organisation
Ministry of Earth Sciences
A-50, Sector 62, NOIDA -201 309, INDIA
Mob: 09496026547
Alternate Email: jkrishna at ncmrwf.gov.in

***********************************************

On Thu, Sep 3, 2015 at 10:39 PM, samo diatta <samo.diatta at univ-zig.sn>
wrote:

> Hi everybody,
> I have a problem with interpreting my CTL file; I have a netcdf file
> with curious time format (or timestamp, see below when I use CDO) with
> ncdump I can view the time dimension; so I decide to use a ctl file to
> set the timestamp and open it with grads, unfortunately an error I
> can't understand occur when I open the ctl file (see below). Someone
> has an idea, how to solve the problem. Find attached the ctl file
>
> ga-> open file_ERAI.ctl
> Scanning description file:  file_ERAI.ctl
> Data file ERAI.EP.1979-2013.nc is open as file 1
> LON set to 0 360
> LAT set to -89.463 89.8339
> LEV set to 1000 1000
> Time values set: 1979:1:1:0 1979:1:1:0
> E set to 1 1
> ga-> q file
> File 1 :
>   Descriptor: file_ERAI.ctl
>   Binary: ERAI.EP.1979-2013.nc
>   Type = Gridded
>   Xsize = 512  Ysize = 256  Zsize = 1  Tsize = 420  Esize = 1
>   Number of Variables = 3
>      lon  0  y,x  longitude
>      lat  0  y,x  latitude
>      ep  0  t,y,x  Budget Evaporation minus Precipitation
> ga-> d ep
> Error: Variable ep not in netcdf file
> Data Request Error:  Error for variable 'ep'
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression
>   Expression = ep
> .................. ncdump gives :
> ncdump -h ERAI.EP.1979-2013.nc
> netcdf ERAI.EP.1979-2013 {
> dimensions:
>         time = 420 ;
>         lat = 256 ;
>         lon = 512 ;
> variables:
>         float EP(time, lat, lon) ;
>                 EP:units = "kg/m2/s" ;
>                 EP:long_name = "Budget Evaporation minus Precipitation" ;
>                 EP:_FillValue = 1.e+20f ;
>         double time(time) ;
>                 time:calendar = "standard" ;
>         float lat(lat) ;
>                 lat:La1 = 89.463f ;
>                 lat:Lo1 = 0.f ;
>                 lat:La2 = -89.463f ;
>                 lat:Lo2 = 359.297f ;
>                 lat:Di = 0.7031252f ;
>                 lat:N = 128.f ;
>                 lat:units = "degrees_north" ;
>                 lat:GridType = "Gaussian Latitude/Longitude Grid
> (Quasi-Regular)" ;
>                 lat:long_name = "latitude" ;
>         float lon(lon) ;
>                 lon:La1 = 89.463f ;
>                 lon:Lo1 = 0.f ;
>                 lon:La2 = -89.463f ;
>                 lon:Lo2 = 359.297f ;
>                 lon:Di = 0.7031252f ;
>                 lon:N = 128.f ;
>                 lon:units = "degrees_east" ;
>                 lon:GridType = "Gaussian Latitude/Longitude Grid
> (Quasi-Regular)" ;
>                 lon:long_name = "longitude" ;
> }
> ............. and
> CDO showdate ERAI.EP.1979-2013.nc
> arning (splitTimevalue) : Reset wrong date/time to 0019-01-01 00:00:00!
>   0019-01-01  0019-01-02  0019-01-03  0019-01-04  0019-01-05
> 0019-01-06  0019-01-07  0019-01-08  0019-01-09  0019-01-10  0019-01-11
>  0019-01-12  0019-01-01  0019-01-02  0019-01-03  0019-01-04
> 0019-01-05  0019-01-06  0019-01-07  0019-01-08  0019-01-09  0019-01-10
>  .......................................................
>
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