[ncl-talk] NetCDF output file from NCL not opening in GrADS

[Adam Phillips]

Hi SB,
Dennis is correct, in that this type of question would be better posed to
the GrADS user forum. However, I have some limited experience with GrADS,
and in my experience GrADS will not open a file unless there is a X
(latitude) and Y (longitude) array present. The arrays do not have to have
anything to do with your tasmax array. Thus, I would recommend writing some
random latitude/longitude arrays to your file along with your tasmax array.

If that advice does not help, I would suggest posing your query to the
GrADS user forum.
Adam



On Wed, Jul 5, 2017 at 4:57 PM, Dennis Shea <shea at ucar.edu> wrote:

> In my view, this question should be sent to the GrADS User forum not
> ncl-talk.
>
> Did you look at the created nc file?
>
> %> ncdump  tas_aave_Asia_bandpass30-100.nc  |  less
>
> ===========================================
> Maybe try making the 'time' dimension unlimited.
>
>
>   filo = "tas_aave_Asia_bandpass30-100.nc"
>   system ("/bin/rm "+filo) ; remove any pre-existing file
>   fo  = addfile(filo , "c") ; open output file
>   *filedimdef*
> <http://www.ncl.ucar.edu/Document/Functions/Built-in/filedimdef.shtml>
> (fo,"time",-1,True)       ; make 'time' unlimited
>   tasmax = xBPF
>
>
> On Wed, Jul 5, 2017 at 10:13 AM, S Br <sbr.climate at gmail.com> wrote:
>
>> Hi,
>> I have applied bandpass filter to my one dimentional NetCDF file. I have
>> written the output to a NetCDF file but this output file is not opening in
>> GrADS. I get the following error.
>>
>> ga-> sdfopen tas_aave_Asia_bandpass30-100.nc
>> Scanning self-describing file:  tas_aave_Asia_bandpass30-100.nc
>> gadsdf: SDF file has no discernable X coordinate.
>>   To open this file with GrADS, use a descriptor file with an XDEF entry.
>>   Documentation is at http://cola.gmu.edu/grads/gado
>> c/SDFdescriptorfile.html
>>
>> Could you please suggest if I am doing somewhere wrong in my NCL script .
>> The input file is perfectly fine with GrADS.
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>> begin
>>
>>    fn  = "tas_aave_Asia.nc" ; define filename
>>    in  = addfile(fn,"r")                                 ; open netcdf
>> file
>>     x  = in->tasmask(:,0,0)                                       ; get
>> data
>>
>> ; ***********************************************
>> ; create the filter weights and apply
>> ; ***********************************************
>>
>>   ihp     = 2                             ; band pass
>>   sigma   = 1.0                           ; Lanczos sigma
>>
>>   nWgt    = 201                           ; loose 100 each end
>>   fca     = 1./100.                       ; start freq
>>   fcb     = 1./30.                        ; last  freq
>>   wgt     = filwgts_lanczos (nWgt, ihp, fca, fcb, sigma )
>>   xBPF    = wgt_runave ( x, wgt, 0 )      ; 30-100 days
>>
>>    copy_VarMeta(x,xBPF)
>>    dNames= getvardims(xBPF)
>>    dSIZES=dimsizes(xBPF)
>>    print (dNames)
>>    print (dSIZES)
>>
>> ; ***********************************************
>> ; create new date array for use on the plot
>> ; ***********************************************
>>   filo = "tas_aave_Asia_bandpass30-100.nc"
>>   system ("/bin/rm "+filo) ; remove any pre-existing file
>>   fo = addfile(filo , "c") ; open output file
>>   tasmax=xBPF(:)
>>   fo->tasmax = tasmax ; write ud to a file
>> end
>>
>>
>> Thanks.
>> SB
>>
>>
>>
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>
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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