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`. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/248#issuecomment-586209060 This list forwards relevant notifications from Github. It is distinct from cf-metad...@cgd.ucar.edu, although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to cf-metadata-unsubscribe-requ...@listserv.llnl.gov.