On 2018-07-22 20:56, Mike H wrote:
The definitions of building=house and building=detached on the wiki
are very similar and don't seem to have any meaningful difference.
I've seen people say that house is meant for rowhouses, and detached
should be for stand-alone houses, but there is no documentation that
explains that. If that is the intended meanings of the tags, then the
wiki pages need some work.
As far as how I've seen things actually mapped, I've only ever seen
the building=house tag. Taginfo shows 1.2 million uses of detached,
and 27.2 million uses of building=house, so they are both used quite a
bit, but house is used a lot more.
Can anyone elaborate on these tags, or have ideas on how they could be
better written about?
https://wiki.openstreetmap.org/wiki/Tag:building%3Dhouse
https://wiki.openstreetmap.org/wiki/Tag:building%3Ddetached
Not speaking of semi-detached that I stumbled upon and which is not in
the wiki at all.
So, we have building=house and building=yes at least.
If we start using building=detached we no longer know if it's a house or
a plain building, do we?
So, detached is not a type of building but an attribute of it.
Else, we would use building=detached for a church.
Detached is not a really useful attribute because it can be seen on the
map and a program can easily determine that one ore more walls are shared.
But if the feeling is that it should be coded, the syntax should be
something like house:detached=yes|semi or rather
building:detached=yes|semi or something like that.
Similarly, if one and the wiki speak of terraced (adjective) houses, is
a terrace a single object with a single house (ahem) number or should
the houses be mapped separately with the attribute building:terraced=yes?
All that must follow strict logic rules and not vague feelings.
And probably the feeling to code building:color=red will be even
stronger because it cannot be seen on the map, but in that case don't
forget to tell the owners to warn about new paint ;-)
As to adopt the terminology of a specific country, it would mean that a
map reader were expected to know all of them to be able to read the map.
Could the wiki be updated to discourage detached=yes and probably
introduce building:<attribute>=<value> as needed so that this discussion
is not repeated periodically? (there are timid
building:cadaster/fireproof/levels already)
All the best,
André.
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