HDF Global (file) and Local (datasets) attributes provide additional information about the file and the file contents. The predefined attributes can be used as a means of compatability with the NETCDF file interface.
Attributes can either be predefined or user defined. Predefined attributes are ones which are set by HDF itself wheras user defined attributes are created by the user. This appendix contains a list of attributes used in OCCAM archive files. To extract attribute information, the correct names must be used in the HDF interface routines along with the correct numerical data type of the attribute.
User defined attributes in OCCAM archive data files.
File Attributes
Name Data Type (HDF) Definitions Default
FMODE Integer(DFNT_INT32) 0:Modelled
1:Observations 1 1:Observational 0
FTYPE Integer(DFNT_INT32) File Type
1: Levitus 3
2: Restart
3: Snapshot
ROTATION Integer(DFNT_INT32) Rotation type 1
1: Non-rotated
2: Rotated
RESOLUTION Integer(DFNT_INT32) Resolution
1:1/4 degree None
MASK_VALUES Floating point Four values used Fill Value
to define land,
submerged land &
ice.
Dataset Attributes
LEVEL Integer(DFNT_INT32) Defines level of a None
2-D dataset.
0 used for a
surface field.
T_GRID Integer(DFNT_INT32) Model grid type
1: t-point 1
0: u/v point
SLABTYPE Integer(DFNT_INT32) Orientation of 2-D data.
of data.
0: East-west 2
1: North-South
2: Horizontal
SLABVALUE floating_point Co-ordinate value of a
a 2-D slice of data.