NetCDF Xdfopen problem

[Donata Giglio]

Sorry for not writing you back before... I've just
read

try this:


ZDEF levels_1 1 LINEAR 1 1
ws=>ws 1 0 Wind Speed
wd=>wd 1 0 Wind Direction

and if doesn't work try

ZDEF levels_1 1 LINEAR 1 1
ws=>ws 0 0 Wind Speed
wd=>wd 0 0 Wind Direction

use xdfopen when you open the descriptor file

hope this helps, bye


--- Mike Johnson <Mike.W.Johnson at NOAA.GOV> ha scritto:

> Donata - thanks for response.  I tried your
> suggestion and it generated the
> following, do you have any idea why?  thanks.
> 1.  ddf file now looks like:
>
> DSET  ^20070824_1200.nc
> TITLE Example NetCDF File
> UNDEF -99999.
> XDEF x 200 LINEAR -125.117 2.5
> YDEF y 200 LINEAR 40.2711 2.5
> ZDEF levels_1 1 LINEAR 1 1
> TDEF n_valtimes 39 LINEAR 12Z24AUG2007 1HR
> VARS 2
> ws=>ws 1 0 t,z,y,x Wind Speed
> wd=>wd 1 0 t,z,y,x Wind Direction
> ENDVARS
>
> 2.  Error now looks like:
> xdfopen 20070824_1200.ddf
> Scanning Description File: 20070824_1200.ddf
> XDFopen Error:  Missing DSET record.
> The data file was not opened.
>
> I'm not understanding this error at all...Do you
> have any idea?
>
> thanks
>
> Mike Johnson
> Senior Forecaster,
> Medford OR Weather Forecast Office
> National Weather Service, NOAA
> (541) 776-4344
>
>
>
> Donata Giglio wrote:
> > Hi!
> > I would try to change these lines:
> >
> > ZDEF levels_1 1 LINEAR 1 1
> > ws=>ws 1 0 t,z,y,x Wind Speed
> > wd=>wd 1 0 t,z,y,x Wind Direction
> >
> > I hope this helps :-)
> > Bye,
> > Donata
> >
> > --- Mike Johnson <Mike.W.Johnson at NOAA.GOV> ha
> scritto:
> >
> >
> >> I've just recently returned to the GRADS
> community
> >> from an extended
> >> absence and was hoping someone could give some
> >> advice on reading a
> >> netcdf file (of which I have no previous
> >> experience).  Anyway, I've
> >> tried a number of things relative to online
> >> documentation and examples
> >> from the users group.  So far I've been
> unsuccessful
> >> in opening the
> >> file. I am using GrADS v1.9b4.  thanks in
> advance...
> >>
> >> Mike Johnson
> >>
> >> Here's symptoms of what I thought was the most
> >> promising methodology.
> >>
> >> *1.  I created a data descriptor file
> >> "20070824_1200.ddf" with following:*
> >>
> >> DSET  ^20070824_1200.nc
> >> TITLE Example NetCDF File
> >> UNDEF -99999.
> >> XDEF x 200 LINEAR -125.117 2.5
> >> YDEF y 200 LINEAR 40.2711 2.5
> >> ZDEF levels_1 LINEAR 1 1
> >> TDEF n_valtimes 39 LINEAR 12Z24AUG2007 1HR
> >> VARS 2
> >> ws=>ws 1 t,z,y,x Wind Speed
> >> wd=>wd 1 t,z,y,x Wind Direction
> >> ENDVARS
> >>
> >> *2.  error produced:*
> >> xdfopen 20070824_1200.ddf
> >> Scanning Description File: 20070824_1200.ddf
> >> XDFopen Error:  Missing or invalid dimension
> size.
> >>  --> The invalid description file record is:
> >>  --> zdef levels_1 linear 1 1
> >>  The data file was not opened.
> >>
> >> *3.  partial ncdump output of 20070824_1200.nc:*
> >>  netcdf 20070824_1200 {
> >> dimensions:
> >>              record = UNLIMITED ; // (39
> currently)
> >>              n_valtimes = 39 ;
> >>              data_variables = 2 ;
> >>              charsPerLevel = 11 ;
> >>              namelen = 132 ;
> >>              x = 200 ;
> >>              y = 200 ;
> >>              levels_1 = 1 ;
> >> variables:
> >>              float ws(record, levels_1, y, x)
> >>                          ws:long_name = "Wind
> Speed"
> >> ;
> >>                          ws:units = "m/s" ;
> >>                          ws:udunits = "meter/sec"
> ;
> >>                          ws:uiname = "windSpeed"
> ;
> >>                          ws:valid_range = -150.f,
> >> 150.f ;
> >>                          ws:_FillValue = -99999.f
> ;
> >>                          ws:_n3d = 1 ;
> >>                          ws:levels = "FHAG 10" ;
> >>             char wsLevels(levels_1,
> charsPerLevel) ;
> >>             char wsInventory(n_valtimes,
> levels_1) ;
> >>             float wd(record, levels_1, y, x) ;
> >>                          wd:long_name = "Wind
> >> Direction" ;
> >>                          wd:units = "degree_True"
> ;
> >>                          wd:udunits =
> "degree_True"
> >> ;
> >>                          wd:uiname = "windDir" ;
> >>                          wd:valid_range = 0.f,
> 360.f
> >> ;
> >>                          wd:_FillValue = -99999.f
> ;
> >>                          wd:_n3d = 1 ;
> >>                          wd:levels = "FHAG 10"
> >>              char wdlevels(levels_1,
> charsPerLevel)
> >> ;
> >>              char wdInventory(n_valtimes,
> levels_1)
> >> ;
> >>              int valtimeMINUSreftime(n_valtimes)
> ;
> >>
> valtimeMINUSreftime:units
> >> = "seconds"
> >>              double reftime ;
> >>                           reftime:long_name =
> >> "reference time" ;
> >>                           reftime:units =
> "seconds
> >> since (1970-1-1
> >> 00:00:00:0)" ;
> >>              char origin(namelen) ;
> >>              char model(namelen) ;
> >> // global attributes:
> >>                           :projIndex = 3 ;
> >>                           :projName = "LATLON"
> >>                           :centralLat = 42.5392f
> ;
> >>                           :centralLon =
> -122.1475f ;
> >>                           :rotation = 25.f ;
> >>                           :lat00 = 40.2711f ;
> >>                           :lon00 = -125.117f ;
> >>                           :latNxNy = 44.7219f ;
> >>                           :lonNxNy = -118.9594f ;
> >>                           :dxKm = 2.5f ;
> >>                           :dyKm = 2.5f ;
> >> data:
> >>
> >> ws =
> >> 8., 8.6,...............................
> >>
> >>
> >
> >
> >
> >
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>




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