[OSM-talk] Segments, ways and order
lists at julius-net.net
Mon Jul 16 19:36:09 BST 2007
Nicola Ranaldo <ranaldo at unina.it> writes:
> Segment order is important for many cases, one_way rendering, areas and so on.
> But it may be that a segment from node x to node y, for a one_way street,
> should appear as from y to x for one or more areas. Sometimes it's impossible
> to "reuse" the same segments. One solution could be in general create new
> segments with the same nodes id, but if this is admitted it may generate a
> lot of duplicates segments and seems to me a waste of resources in a
> topological model. Another solution could be in reuse an existent segment if
> it has the right order or to create the inverse if it does not match. A third
> solution could be in having software renderers compute the node order for
> areas at runtime with smart algorithms. In this case it will exists only one
> segment from x to y and will be reused for every way containing node x and y
> without care for the order. This maximizes the topological model but may
> create problems in areas with holes.
Another solution would be to do away with segments and have ways
reference nodes directly.
(I know this has been discussed before and a transition would not be
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