On 29/10/2015 20:40, Colin Smale wrote:
How can that spatial lookup be made very cheaply? How long will it take
to do a point-in-polygon for every road sign in Europe?
It's very cheap. I do polyline-in-polygon for every single road and path
I render on cycle.travel, because I have different rendering styles for
urban and rural areas. The polygons (160,000 in Western Europe) are a
significantly more complex dataset than countries would be, yet the
query to update the roads is trivial, and plenty fast considering it's
every single road.
Do you have hands-on experience in the subject that counters that?
> I understand one
> should not denormalise lightly, but it is sometimes justifiable. We need
> to keep the data easily consumable as well. Saying that two extra
> characters in the tagging will present an unreasonable barrier to
> mappers is stretching a point I think.
It's very easy for you, as an experienced mapper, to say that. Wikipedia
is a salutary lesson in what happens to projects who start to tilt the
editing experience principally towards the experienced.
"Since 2007... well-intentioned newcomers are far less likely to still
be editing Wikipedia two months after their first try."
http://www.technologyreview.com/featuredstory/520446/the-decline-of-wikipedia/
Richard
_______________________________________________
Tagging mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/tagging
