Hi Andrew,
There a few conceptual things I don't understand about how is_in would
be implemented with regard to suburbs
I'm curious; if the border of a suburb is defined by a road; does the
border change when the road is changed? If, for some reason, the
boundary road was moved 10m north, does the suburbs grow/shrink
accordingly? Is the suburb border an infinitely narrow line in the
"centre" of the roadway, or does the road sit entirely within one suburb
or another? What if a lanes are uneven?
If it is not bound to the roadway, and is instead "static" geometry,
then you could have a situation where a road which is supposed to be the
border is actually entirely misaligned with the legal border. Is_in
doesn't cause these issues, but I think it may worsen individual
situations by providing a misleading explanation about where a road
actually is. I'd also be concerned about maintenance in growth areas
where new suburbs are declared, etc.
Dian
On 2022-01-07 18:38, Andrew Hughes wrote:
Hi All,
Since I am only trying to define those that cannot be determined
spatially, this sounds correct to me:
https://wiki.openstreetmap.org/wiki/Key:is_in
Explanation: Yes, they do say that the use is discouraged, but that is
purely on the basis of boundaries being used as spatial relationships.
I'm looking at exactly when that is not possible. I wouldn't want to
tag something that clearly has a spatial relationship (topologically
correct) with a boundary. Then, there's not discussion aroune what to
do when this happens, only that others still advocate its use for such
a scenario.
For the record, an example of why this is needed....
We'll have a list of roads "Evergreen Terrace, Springfield" and we'll
have some information about the road like "Cars from Shelbyville are
not allowed". If we can't locate these road(s) in OSM because the
topology of the road/suburb is inaccurate - we can't map it. Thus,
either the topology needs fixing (which I believe is impossible and I'm
not going to bother talking about that) or the roads on the boundary
can have a tag which is absolute and can be used preferentially (if
desired).
Thoughts?
Cheers,
AH
On Thu, 6 Jan 2022 at 09:02, Graeme Fitzpatrick <graemefi...@gmail.com>
wrote:
On Wed, 5 Jan 2022 at 20:03, Ewen Hill <ewen.h...@gmail.com> wrote:
Hi Graeme and happy new year,
How much can you datamine from a suburb:left , suburb:right ? I would
suggest suburb polygons and street names only which would cover all
eventualities and allow for the change in the suburb area without
having to touch each road affected
I agree entirely & wouldn't use it myself, but was suggesting a
possible option!
I'd leave it as Sandgate Road by itself, but with 436 Sandgate Road,
Clayfield Qld 4011, & 475 Sandgate Road, Albion Qld 4010, tagged on the
individual buildings themselves, as they currently are.
Thanks
Graeme _______________________________________________
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