[OSM-dev] osmtools first release - nodeID

Hendrik Siedelmann hendrik.siedelmann at googlemail.com
Tue Apr 29 10:31:14 BST 2008


2008/4/29 Robert (Jamie) Munro <rjmunro at arjam.net>:

> Marcus Wolschon wrote:
 >  | Hendrik Siedelmann schrieb:
 >  |
 >  | | Nodes can still be identified by their lat/lon coordinates. As nodes
 >  | | are not duplicated in the database this is possible. And routing still
 >  | | needs to find which ways reference a node, so routing from one way to
 >  | | another is still complicated. On the other hand checking if another
 >  | | way uses the same points is fast on a spatial database (I will at some
 >  | | time provide funktions provide routing)
 >  |
 >  | So the system cannot know the difference between 2 ways sharing the same
 >  | node and 2 ways with 2 nodes that just share the same coordinates?
 >
 >  Does that really happen a lot? Most things I know of pass over / under
 >  each other without both having nodes at the /exact/ point they cross.
 >  Couldn't you fake it by moving each of the nodes a few cm in each
 >  direction (i.e. round the last bit of the 32 bits up or down instead of
 >  down or up). It's unlikely to be the least accurate part of the map...

 Possible. But I won't start hacking the Map data, also updates would
 get difficult. But I already uploaded a new version which stores ids
 and lat/lon in the ways so that osm_server will deliver osm files with
 correct ids.




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