[Tagging] compressed_air=yes / no - adding to amenity=fuel

[Martin Koppenhoefer]

>
>
> no, as =separate should be treated as pointless synonym of =yes
>
>

if you want to count all x in an area you would omit the x=separate and
count the x=yes, that's the idea. It will reduce the error margin from
double counting if we start doing it, at the cost of having to deal with
separate as a yes value for certain queries.


>
> If you count both atm=yes and amenity=atm then you WILL double count.
>
>

Not combining both queries, you would miss _a lot_ of atms, I do not
consider this an option. Errors can of course be reduced through filtering
by proximity, which will give false positives (might again be reducible
looking at the brand and operator values) but would overall probably
improve the count accuracy. In particular atm nodes inside bank polygons
would lead to atm=yes on the bank not being counted in addition.

Separate is not a solution alone, but it can help estimating a count.


> Pretending that =yes is correct only when object is not mapped separately
> is not viable, ignores existing mapping and is not helpful.
>


it is not about pretending that "yes" is incorrect, it is an alternative
yes with added semantics.

Cheers,
Martin
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