Goedenavond.

(there - that should mask my linguistic failures enough for me to fall back 
into english now)

My GPS trace analyzer, That Shouldn't Be Possible™ has recently extended its 
reach beyond the british isles to cover benelux too.

Its purpose? To accept a GPS trace of a drive/cycle you've gone for, analyze 
the journey against the routable OSM database and, if appropriate, say "That 
Shouldn't Be Possible". Used like this, it can find quite a lot of routing 
problems or road segments missing from the database.

It can also be used to take the hard work out of checking the OSM database 
against your trace after a long journey by flagging up sections that don't 
quite agree with OSM.

Not quite sure whether you've got that complex junction interlinked and tagged 
right? Have a gps trace or two that traverses it? That Shouldn't Be Possible 
might be able to help you.

An (extra special dutch) example analysis result can be seen here[1]: I've left 
a nice great big error (visible as a spike in the plot) in the middle of it as 
an example where the trace seems to traverse what's marked as a path.

I've written a lot more about it on the wiki[2], so I'm not going to duplicate 
all that blather here. It's still in what I would call a prototype stage, but 
it works surprisingly well for "motorcar" traces (less so for bicycle so far, 
though I would say that's largely the fault of OSRM's bicycle profile). Even 
so[3] I encourage mappers to try it out[4] on one of their traces.


robert.

[1] http://ris.dev.openstreetmap.org/tsbp-proto/779918/2/2/
[2] http://wiki.openstreetmap.org/wiki/That_Shouldnt_Be_Possible
[3] Especially so - I need testers.
[4] http://ris.dev.openstreetmap.org/tsbp-proto/

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