Am 07.01.2011 17:12, schrieb Nic Roets:
On Fri, Jan 7, 2011 at 4:39 PM, Mike N.<nice...@att.net> wrote:
Recently I encountered a CSI-style mystery. Why was the Skobbler lady (OSM
Nav based) telling people to go jump off of so many bridges? An inspection
showed that the bridges were joined to the interstate highway below, but
many interchanges otherwise had very high quality edits, with attention to
many details. So how did the people who made such skilled edits overlook
false intersections? It turns out that they didn't. A history view shows
the dreaded "Removing duplicate nodes" in the change list. The original
edit just used JOSM's un(G)lue node command, leaving the dupe nodes in
place. A perfectly valid technique until the attack of the duplicate node
bots.
Mike, please don't blame the bot. Ungluing a node an just leaving it
there, is really looking for trouble. Some routing engine(s) glue
nodes together that are less than a few centimeters from each other.
Now you may want to complain that those routing engine(s) are buggy,
but that "bug" has historically made things easier rather than more
difficult. And going forward, I expect it to continue to be a
"feature" rather than a bug.
-1
I (partly) disagree here.
I agree that it's kind of feature to collapse nodes in routing engines
to save complexity of the routing graph, but Mike mentioned, that with
that implementation of this "feature" a change in the topology occurs:
there are connections not present in the original data before the
glueing routine.
THAT IMHO is a bug, not a feature.
regards
Peter
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