HDF files

[Don Hooper]

Dan Holloway,

As you no doubt imagine, it does, provided one uses the gradsdods
binaries.  Linking with the OPeNDAP client libraries, as that one
does, provides this transparantly.  Again, as I suspect you well know.  ;)

-Hoop
> From owner-gradsusr at LIST.CINECA.IT  Wed Feb  2 15:00:35 2005
> Reply-To: d.holloway at gso.uri.edu
> From: Dan Holloway <d.holloway at gso.uri.edu>
> Organization: University of Rhode Island
>
> Hoop,
>
>   Can the DSET lines in DDF files use DODS URLs similar
> to the sdfopen interface?
>
>   Dan
>
> On Wed, 2005-02-02 at 16:41, Don Hooper wrote:
> > Andreea Ira,
> >
> > Just lose the ZDEF line from the DDF.  If you use one, it must name a
> > dimension.  I don't see any dimension in your data file that qualifies, so
> > just don't use one.  All lines in the XDFopen-style DDFs are optional
> > except for DSET.
> >
> > -Hoop
> > > From owner-gradsusr at LIST.CINECA.IT  Wed Feb  2 12:54:34 2005
> > > From: Andreea Ira <andreea_ira at YAHOO.COM>
> > >
> > > Dear all,
> > >
> > > I am having some troubles in completing the task of
> > > reading and displaying data in hdf format using GrADS
> > > and I would appreciate your assistance.
> > >
> > > Since according to the directions to read and display
> > > the data in question, I need to create a .ddf file, I
> > > did so using the information that I can obtain from a
> > > dump (created using hdf binaries and following the
> > > from the README file).
> > >
> > > 1.  I include here the contents of the dump file:
> > >
> > > dimensions:
> > >         2_5_deg__regional_colat__zones = 72 ;
> > >         2_5_deg__regional_long__zones = 144 ;
> > >         days = 31 ;
> > >         hours = 24 ;
> > >         5_0_deg__regional_colat__zones = 36 ;
> > >         5_0_deg__regional_long__zones = 72 ;
> > >         10_0_deg__regional_colat__zones = 18 ;
> > >         10_0_deg__regional_long__zones = 36 ;
> > >         2_5_deg__zonal_colat__zones = 72 ;
> > >         5_0_deg__zonal_colat__zones = 36 ;
> > >         10_0_deg__zonal_colat__zones = 18 ;
> > >         2_5_deg__global_zone = 1 ;
> > >         5_0_deg__global_zone = 1 ;
> > >         10_0_deg__global_zone = 1 ;
> > >
> > > variables:
> > >         float
> > > Solar_incidence(2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >                 Solar_incidence:_FillValue =
> > > 3.4028235e+38f ;
> > >                 Solar_incidence:valid_range = 0.f,
> > > 500000.f ;
> > >                 Solar_incidence:long_name = "2.5
> > > Degree Regional, Monthly (Day), Total-sky Averages" ;
> > >                 Solar_incidence:units = "Watt hours
> > > per square meter" ;
> > >         float
> > > Net_radiant_flux(2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >                 Net_radiant_flux:_FillValue =
> > > 3.4028235e+38f ;
> > >                 Net_radiant_flux:valid_range = -200.f,
> > > 200.f ;
> > >                 Net_radiant_flux:long_name = "2.5
> > > Degree Regional, Monthly (Day), Total-sky Averages" ;
> > >                 Net_radiant_flux:units = "Watts per
> > > square meter" ;
> > >         float
> > > Longwave_flux(2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >                 Longwave_flux:_FillValue =
> > > 3.4028235e+38f ;
> > >                 Longwave_flux:valid_range = 50.f,
> > > 450.f ;
> > >                 Longwave_flux:long_name = "2.5 Degree
> > > Regional, Monthly (Day), Total-sky Averages" ;
> > >                 Longwave_flux:units = "Watts per
> > > square meter" ;
> > >         float
> > > Shortwave_flux(2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >                 Shortwave_flux:_FillValue =
> > > 3.4028235e+38f ;
> > >                 Shortwave_flux:valid_range = 0.f,
> > > 1400.f ;
> > >                 Shortwave_flux:long_name = "2.5 Degree
> > > Regional, Monthly (Day), Total-sky Averages" ;
> > >                 Shortwave_flux:units = "Watts per
> > > square meter" ;
> > >         float Albedo(2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > > Longwave_flux:units = "Watts per square meter" ;
> > >         byte Number_of_hours_of_longwave_flux(days,
> > > 2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >
> > > Number_of_hours_of_longwave_flux:valid_range = '\0',
> > > '\30' ;
> > >
> > > Number_of_hours_of_longwave_flux:_FillValue = '\177' ;
> > >
> > > Number_of_hours_of_longwave_flux:long_name = "2.5
> > > Degree Regional, Daily, Total-sky Averages" ;
> > >                 Number_of_hours_of_longwave_flux:units
> > > = "hours" ;
> > >         float Shortwave_flux(days,
> > > 2_5_deg__regional_colat__zones,
> > > 2_5_deg__regional_long__zones) ;
> > >
> > > 2.  I used information from here to create a .ddf file
> > > that will then be used with the GrADS xdfopen file
> > > command.  I include the file here (I followed the
> > > example provided by the GrADS web site that describe
> > > this):
> > >
> > > DSET ^CER_ES4_Aqua-FM3_Edition2_024024.200207
> > > TITLE This is only a test
> > > UNDEF 1.0E15
> > > XDEF 2_5_deg__regional_long__zones 144 LINEAR -180.0
> > > 2.5
> > > YDEF 2_5_deg__regional_colat__zones 91 LINEAR  -90.0
> > > 2.0
> > > TDEF days 31 LINEAR 0Z01JUL2002 1MO
> > > ZDEF 1 LEVELS 1000
> > > VARS 5
> > > Solar_incidence=>solin 0 99 Incident Radiation
> > > Net_radiant_flux=>netflux 0 99 Net radiation
> > > Longwave_flux=>lwflux 0 99 Longwave flux
> > > Shortwave_flux=>swflux 0 99 Shortwave flux
> > > Albedo=>albedo 0 99 Albedo
> > > ENDVARS
> > >
> > > 3.Finally, when I try to open the file in GrADS using
> > > xdfopen command, I receive these errors:
> > >
> > > XDFopen Error:  Missing or invalid dimension size.
> > >   --> The invalid description file record is:
> > >   --> zdef 1 levels 1000
> > >   The data file was not opened.
> > >
> > > I am using grads 1.8SL11
> > >
> > >
> > > Thank you,
> > >
> > > Andreea Ira