[Openstreetmap] london free maps...

[Matt Amos]

On Thursday 11 November 2004 22:07, Jo Walsh wrote:
> It's normalising tracks into lines and shapes that concerns me,
> really, deciding when to aggregate parallel tracks into one line,
> stitching broken segments together into a path, annotation tools
> that can quickly allow users to turn sets of lines into shapes; and
> then being able to reify new sets of tracks against existing things
> that we have decided are definitely lines and shapes... as
> automatically as possible, with a helpful GUI for suggesting areas
> that should be checked by a human. That's the sort of thing i'd
> really like ti hear about other peoples experiences with /
> algorithms for....

determining how to convert raw GPS tracks into something more useful 
is something i've been giving a lot of thought to, recently. 
unfortunately, i haven't managed to think of anything beyond the 
obvious, so far. its a Difficult Problem ;-)

there might be some mileage in doing data mining on very large 
collections of tracks in order to generate connectivity automatically 
(i.e: an algorithm that knows that a car has to stop at a junction 
can use that as an heuristic), but if we want to get maps from the 
smallest number of routes (initially, obviously) then we have to use 
people's innate experience of the route that they have just 
travelled.

adjusting existing routes on the basis of new tracks might be simpler, 
however...

> what does openstreetmap have now, that we can data share? i really
> liked the look of http://geowiki.co.uk when it started, but my last
> email to the maintainer bounced... :/

umm... lots of ideas?

i'm sure all of the people on this mailing list have a private stash 
of GPS tracks. we're just waiting for the project to come together so 
we can use them!

cya,

matt
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