[Talk-in] Delhi: OSM for navigation

[Vikas Yadav]

http://yournavigation.org/?flat=28.440111&flon=77.03397&tlat=28.510829&tlon=77.165627&v=motorcar&fast=1&layer=mapnik

this is a wrong route on fastest car mode. its still less hard to fix.

http://yournavigation.org/?flat=28.440111&flon=77.03397&tlat=28.455312&tlon=77.045064&v=motorcar&fast=1&layer=mapnik

This is totally wrong which i could not fix after many attempts. in this
fastest route, it takes the second entry (sec 15) to the express way and not
the first (rajiv chowk). express way is motorway (more points) than
secondary. i even tried changing service lane to "service", "territary",
"residential", etc but gosmore just does not like to take the fastest route.

please suggest if there is a way to solve this problem.

i understand that gosmore does not consider calming (speed brakers) and
traffic signals yet but even then its the wrong route based on scoring road
types. then there was once I routed to go to palwal (never gone there before
so had no clue on how to go) and reached NH1. that NH1 was inside a sabza
mandi and was only wide as 5 metres in a very congested locality (don't know
where i was in delhi). gosmore was regard this road as trunk and so it
should be too but it should be scored as living_street while routing for
speed. there are many such examples i could try but i can't think of good
solutions to these.

most of my routes circle around cryptic areas like dhual kuan (and properly
considering one ways) or airport junctions. such areas are very tasty to
find flaws.

There other nonsense routes like (
http://yournavigation.org/?flat=28.440111&flon=77.03397&tlat=28.499143&tlon=77.089974&v=motorcar&fast=1&layer=mapnik)
which mostly happen for incorrect one way tags or minor error in connecting
streets etc.

2009/9/3 Gora Mohanty <gora at sarai.net>

> On Wed, 2 Sep 2009 22:17:17 +0530
> ヴィカス ヤダワ (vikas yadav) <mevikas at gmail.com> wrote:
>
> > Welcome pal!
> >
> > Im Vikas from south west gurgaon.
> > I have been working along with gosmore and improving quality
> > (beside regular surveys).
> > But there seems to be a hard hurdle for general routing logic to
> > apply on indian streets.
> [...]
>
> Not sure where you feel that the hurdle is. Please elaborate, so
> that we can try to eliminate it.
> o Routing software (gosmore, etc.) is already available, and we
>  have Python/Django software that uses the Dijkstra (or, however
>  you spell his name) shortest-path algorithm to find all optimal
>  routes for a set of locations, and paths. We would be willing to
>  open source this. So, this is hardly the roadblock.
> o Where I feel that the problem lies is in the quality of the path
>  data, like having every street corner mapped, so that the software
>  can calculate best routes, and alternative ones.
> o Even more interesting is getting tonnes of realtime travel data
>  from GPS devices, which would let one calculate optimal routes
>  based on travel times.
>
> We really need to have another OSM/GPS meeting for Delhi/NCR based
> folk.
>
> Regards,
> Gora
>
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