[OSM-dev] Interpreting segments of a way

[Etienne]

Ways are *ordered* lists of segments.

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.

Etienne



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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