[ncl-talk] Time dimension in output to NetCDF

[Dr. Muhammad Afzaal]

in continuation to my previous email, following is the defined variable
summary

Variable: prcp
Type: double
Total Size: 27336960 bytes
            3417120 values
Number of Dimensions: 3
Dimensions and sizes:   [time | 1356] x [lat | 42] x [lon | 60]
Coordinates:
            time: [190101..201312]
            lat: [12.25..32.75]
            lon: [30.25..59.75]
Number Of Attributes: 3
  units :       (mm)
  long_name :
  _FillValue :  -9.969209968386869e+36

Please read the second last line of my code as ncdf->prcp = prcp

Thanks

*Dr. MUHAMMAD AFZAAL KARORI*
Pakistan Meteorological Department
Sector H-8/2, Pitras Bukhari Road,
Islamabad - 44000
Pakistan



On Thu, Nov 30, 2017 at 12:06 PM, Dr. Muhammad Afzaal <
afzaalkarori at gmail.com> wrote:

> Dear NCL users
>
> I am using NCL 6.4.0 on ubuntu. I need to write a variable to netcdf file.
> I did it successfully using Method 1 given on ncl homepage. I have little
> problem that when I open nc file in grads, the time is not realistic. I
> mean its like;
>
> Time values set: 2320:6:25:0 2320:6:25:0
>
> while the variable has the time from 190101 to 201312
>
> Can someone please help me how can add time dim as that attached with the
> define variable? My code is given below
>
> ;====================================================
> begin
>
>   diri   = "./"
>   fili   = "precip.mon.total.v7.nc"
>   f      = addfile(diri+fili, "r")
>
>   prc    = flt2dble(f->precip(:,{12:33},{30:60}))
>   pmsg   = prc at _FillValue      ; convenience
>
> ;*********************************
> ; plot parameters
> ;*********************************
>   dimprc = dimsizes(prc)
>   ntim   = dimprc(0)
>   nlat   = dimprc(1)
>   mlon   = dimprc(2)
>
>   tim  = f->time
>   utc_date = cd_calendar(tim, 0)
>   year    = tointeger(utc_date(:,0))
>   yrStrt  = year(0)
>   yrLast  = year(ntim-1)
>   nyear   = yrLast-yrStrt+1
> ;print(year + " " + yrStrt + " "+ yrLast +" "+ nyear)
>   yyyymm  = yyyymm_time(yrStrt, yrLast, "integer")
>
>   yrfrac  = (/ yyyymm_to_yyyyfrac(yyyymm, 0.0) /)
>   prc&time = (/ yyyymm /)
>
> ;===============================================================
> ;write to nc file
> ;================================================================
>
>     system("/bin/rm -f prc_3mon.nc") ;remove any pre-existing file
>     ncdf = addfile("prc_3mon.nc" ,"c") ; open output netCDF file
>
> ;===============================================================
> ; create global attributes of the file (optional)
> ;================================================================
>        fAtt               = True        ; assign file attributes
>        fAtt at title         = "GPCC Rainfall"
>        fAtt at source_file   = "precip.mon.total.v7.nc"
>        fAtt at Conventions   = "None"
>        fAtt at creation_date = systemfunc ("date")
>        fileattdef( ncdf, fAtt )           ; copy file attributes
>
> ;===============================================================
> ; make time an UNLIMITED dimension;recommended for most applications
> ;===============================================================
>
>        filedimdef(ncdf,"time",-1,True)
>
> ;===============================================================
> ; output variables directly; NCL will call appropriate functions
> ; to write the meta data associated with each variable
> ;===============================================================
>        ncdf->spi  = spi                          ; 3D
> end
>
>
> Regards
> *Dr. MUHAMMAD AFZAAL KARORI*
> Pakistan Meteorological Department
> Sector H-8/2, Pitras Bukhari Road,
> Islamabad - 44000
> Pakistan
>
>
>
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