[OSM-dev] Interpreting segments of a way

[bvh]

On Mon, Oct 23, 2006 at 03:37:19PM +0100, Etienne wrote:
> Ways are *ordered* lists of segments.

On what basis should the ordering take place?

> Currently there is no requirement for the segments to be contiguous or all
> pointing in the same direction.
>
> At the moment many ways do have branches and loops in them.
>
> There are proposals to change the data model so that ways are ordered lists
> of *nodes*.  This will prevent the creation of ways that contain branches
> etc.  Existing ways containing branches will, no doubt, get converted into
> several smaller non-branching ways.

Which seems limiting. I know a few streets that are non-continious. How
would those be represented in the new proposals?

cu bart
> 
> On 10/23/06, bvh <bvh-osm at irule.be> wrote:
> >
> >Hi, there is some conflicting/incomplete(?) information on how to
> >interpret the segment list of a way on the wiki.
> >
> >http://wiki.openstreetmap.org/index.php/Data_Primitives
> >Just says segments for a way nothing more.
> >
> >http://wiki.openstreetmap.org/index.php/REST#Ways
> >says that the list is "ordered".
> >
> >What is it and in the latter case : how should we interpret the
> >ordering? Should ways consist of consecutive segments where each
> >segment-endpoint is also the beginpoint of the next segment?
> >Can three-pronged ways exist? If so, what about the order?
> >
> >Thanks for any clarification. If I get a good idea I will update the
> >WIKI accordingly.
> >
> >cu bart
> >
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> >