[Talk-ca] Question about using Relationships

[Corey Burger]

On Sat, Dec 20, 2008 at 10:08 AM, Richard Degelder <rtdegelder at gmail.com> wrote:
> I have seen the wiki for relationships
> http://wiki.openstreetmap.org/wiki/Relations but have some questions about
> it.  I am hoping that someone can clarify them for me.
>
> If I want to have something like a bus route as a relation on a way but the
> bus route does not follow the entire length of that way, there is a portion
> of the way before and after the portion used by the bus, how would I go
> about adding that relation?  Is it required that I divide the way into the
> segments into before the bus enters the way, the portion used for the bus
> route, and the portion after the bus has left the way or is there another
> means, without dividing the way into segments, that I can have the
> relationship  for only the pertinent portion of the way on which the bus is
> traveling.  Having to divide a way, especially for a small portion on which
> a bus route runs or where there is a lot of routes converging/diverging over
> a short portion of a way seems to be inefficient and potentially messy for
> the map.

You need to divide the way up into multiple pieces, yes. (btw, avoid
the word segments, as that is a term for a discontinued data type, so
people might get confused). As for it being messy, it isn't because
both mapnik and osmarender join ways back together before they render
them.

Cheers,

Corey