HDF files

[Andreea Ira]

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



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