Steve,
The UDUNITS-1 library had a bug in it. The bug was that "g" was
interpreted as meaning "gravity" (i.e., "standard_free_fall") rather
than "gram". This was corrected in version 1.12.10 of the UDUNITS-1
package, which was released on 2009-09-17.
The UDUNITS-2 package did not have this bug from the outset.
Thanks for this, however this is not the only incompatibility I have
found. Another one is specifying microns. Udunits1 understands 'um',
while Udunits2 recognises 'µm'. I note that the CF conventions list in
Table 3.1 that the abbreviation for micro is 'u', not 'µ'.
It may well be that these are the only 2 incompatibilities - in which
case, it might be wise to note these specifically in the conventions, ie
to specify that "The value of the |units| attribute is a string that can
be recognized by UNIDATA"s Udunits package (version 1.12.10 or higher)
<http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#udunits>",
and perhaps that '1e-6' should be used in place of u/µ to ensure
compatibility with both versions.
Cheers,
Andrew
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