[Tagging] Feature proposal - RFC - ele with units

[Minh Nguyen]

Vào lúc 22:08 2021-12-02, Peter Elderson đã viết:
> Taginfo shows less then 1000 ele:ft and over 7,6 million ele.
>   
> Shouldn't be a major problem.

I think you're referring to the global taginfo, but no one is suggesting 
that every ele=* worldwide should be expressed in feet. (That ship 
sailed in 1875.) There are 5.1 million ele=* tags in the U.S., of which 
at least 4.9 million came from bulk imports of buildings, POIs, and 
peaks. [1] In my opinion, it's more important to focus on the impact 
going forward on manual mapping of features for which elevation is 
highly relevant, rather than existing bulk imports of features for which 
elevation is of lesser importance.

To be clear, I'm not proposing to retag anything. The proposal is only 
about removing a historical anomaly in the documentation and codifying 
existing practice, accepting that mappers will keep introducing values 
that conform to OSM's well-established standards regarding units.

I'd welcome discussion about the impact to editors and data consumers, 
with the recognition that some of it has long been present regardless of 
the proposal. And if it truly is too late to change the documentation, 
then let's discuss how to mitigate dataloss from values without an 
explicit feet indication and from inaccurate conversions to a larger unit.

[1] 
https://wiki.openstreetmap.org/wiki/Proposed_features/ele_with_units#Features_affected

-- 
minh at nguyen.cincinnati.oh.us