NetCDF Xdfopen problem

[Donata Giglio]

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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