[OSM-talk] Topology (was: OSM the mediocre alternative)
Schuyler Erle
schuyler at nocat.net
Fri Apr 27 05:49:11 BST 2007
* On 23-Apr-2007 at 5:12AM PDT, Frederik Ramm said:
>
> And then uploading it to the server as two points which just happen
> to be at the same location? To me there's a world of difference
> between two nodes that just happen to be at the same position and two
> features connecting at the same node because it is (topo)logically
> the same node.
>
> For example, there's a railway line going over a bridge, and below it
> is a river.
This reads to me more as an argument for z-index, or even altitude,
than one for topology.
> It is always hard to create something from nothing. If the
> information isn't there, where should the editor get it from? Trying
> to infer topology from simple features, in my eyes, is pure
> guesswork and I will always be able to provide an example where it
> fails, blatantly.
Do you have any examples that don't involve a difference in altitude
or z-index? I can't think of one. :-/
SDE
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