Gerrit Holl said the following on 11/16/2010 8:12 AM:
> I am moving from NetCDF to HDF5. In NetCDF, I can assign attributes to
> each variable/column. That is very useful for self-documenting the
> file like this:
>
> double AVHRR_LONG(Collocations) ;
> AVHRR_LONG:long_name = "AVHRR Longitude" ;
> AVHRR_LONG:units = "degrees_east" ;
> AVHRR_LONG:valid_range = -180., 180. ;
>
> I know that in HDF5, I can assign attributes to each node. But I think
> the columns of a table are not nodes. Is there an equivalent in HDF5
> to NetCDF's variable attributes? How would I use this in pytables?
You can store arbitrary key/value pairs on a node by using the node's
_f_setAttr() method. I use this frequently and in much the same way as in your
example. The key is the column name, and the value is a Python dictionary
containing the long name, units, etc.
Example: n._f_setAttr('AVHRR_LONG':{'long_name':'AVHRR_Longitude',
'units':'degrees_east', 'valid_range':(-180.0,180.0)})
You can then extract the values using _f_getAttr().
--
David E. Sallis, Senior Principal Engineer, Software
General Dynamics Information Technology
NOAA Coastal Data Development Center
Stennis Space Center, Mississippi USA
228.688.3805
david.sal...@gdit.com
david.sal...@noaa.gov
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