As Klaus points out, the units need to come from the Udunits list, so the 
correct units attribute would be `US_survey_foot`. 

When I use the Udunits2 linux command line tool, it gives a conversion factor 
of 0.304801, which is significantly less precise. The XML database that comes 
with the python package gives the more precise value of 1200/3937.  

Given that it takes some digging to get the conversion factor out of Udunits, I 
can see a potential case for providing space to add it explicitly. You would 
need, however, to indicate what the target units are, e.g. 
`meter_conversion_factor`.

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