> 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.
I have seen Gurgaon maps coming up very fast of late and could identify your contribution. I had tried gosmore and http://yournavigation.org for offline routing, and was ok with the routes offered. But this time what I tried to do was use a commercially available device for navigation. There was no problem with routing algorithm, instead it was with map data quality. e.g. many areas are marked incorrectly, many roads are drawn incorrectly and one can see multiple lines running along same road. The problem is faced, when say, I load the map for NCR and search for sector-18. Gurgoan and Noida both have Sector-18, but since areas are not marked properly, it displays two results "Sector-18, National Capital Region" because Garmin tries to identify the area by the nearby city/town/locality name. This brings up another issue, most of the localities in Gurgaon (DLF-3, Sushant Lok, Udyog Vihar etc.) are being identified as "Cities" by the device. So, may be we need to change the classification of these areas as "Locality" or "Land User->Residential". I also believe, routing logic also takes into account what kind of roads it has to choose from (motorway, primary, secondary, tertiary etc.), and there is still some incosistency in classifying the roads too. IMHO, creating tracks is a comparatively easier job but the tough job is to create a decent map with correct information accomodating details as fine as possible. While creating the map, if we ignore small things that seem not so important to us may become important while trying to find route or navigate using the map. Once we start cleaning up the data, routing algorithm might start loving Indian roads, > Where is your locality in NCR? I am in DLF Phase 3. regards, Nishant -- How about some patent on "(a+b)2 = a2+2ab+b2". Choose free software! http://www.nishants.net _______________________________________________ Talk-in mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-in
