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<div class="moz-cite-prefix">On 2018-07-22 20:56, Mike H wrote:<br>
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<blockquote type="cite"
cite="mid:CAAgehBK+_yO1EJUFgomP=WZEJNJcxd7S8eu+hPB+dS4fqYLhkw@mail.gmail.com">
<div dir="ltr">The definitions of building=house and
building=detached on the wiki are very similar and don't seem to
have any meaningful difference.
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<div>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.</div>
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<div>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.</div>
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<div>Can anyone elaborate on these tags, or have ideas on how
they could be better written about?</div>
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<div><a
href="https://wiki.openstreetmap.org/wiki/Tag:building%3Dhouse"
moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Tag:building%3Dhouse</a><br>
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<div><a
href="https://wiki.openstreetmap.org/wiki/Tag:building%3Ddetached"
moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Tag:building%3Ddetached</a><br>
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</blockquote>
Not speaking of semi-detached that I stumbled upon and which is not
in the wiki at all.<br>
<br>
So, we have building=house and building=yes at least.<br>
If we start using building=detached we no longer know if it's a
house or a plain building, do we?<br>
So, detached is not a type of building but an attribute of it.<br>
Else, we would use building=detached for a church.<br>
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.<br>
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.<br>
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?<br>
All that must follow strict logic rules and not vague feelings.<br>
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 ;-)<br>
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.<br>
<br>
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)<br>
<br>
All the best,
<br>
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<td>André.</td>
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