On Mon, 2 May 2011 17:28:08 +0200 Cedric BAIL <cedric.b...@free.fr> wrote:
> On Mon, May 2, 2011 at 5:00 PM, Carsten Haitzler > <ras...@rasterman.com> wrote: > > On Mon, 2 May 2011 20:20:04 +1000 David Seikel <onef...@gmail.com> > > said: > >> On Mon, 2 May 2011 16:12:14 +0900 Carsten Haitzler (The Rasterman) > >> <ras...@rasterman.com> wrote: > >> > On Sat, 30 Apr 2011 19:28:31 +0900 sangho park > >> > <gouach...@gmail.com> said: > >> > > >> > > some years ago, i made route application using local map data. > >> > > at that time, dijkstra's algorithm was a perfect solution. > >> > > now I'm downloading 'asia.osm.bz2'. it is 2.3 Gbytes.. > >> > > the size is reasonable for recent mobile external memory. > >> > > >> > did it take into account speed limits, traffic lights, possible > >> > traffic patterns at times of day, favor routes with fewer > >> > "turns" or (right turns on right-side-of-road driving maps, vs > >> > left turns on left-side-of-road driving maps etc.), know about > >> > tolls, highways vs local roads and more. as best i know about > >> > the whole mapping and routing world there is a massive amount of > >> > such more fuzzy logic involved in making a good mapping/routing > >> > algorithm and it requires both lots of extra metadata and "fuzzy > >> > logic". users also should be able to tweak the route "shortest > >> > distance", "fastest trip", "least number of turns", "favor > >> > highways", "avoid tolls". this is where the whole work reallly > >> > becomes meaty. :) > >> > >> Lucky for my purposes, I'm walking and don't need any of that fancy > >> stuff. B-) > > > > u'd need the "can get there by foot" option :) many times a road > > exists that allows cars but not pedestrians :) > > > >> Something simple and flexible to start with would be great. With > >> the ability to add modules for the fancy things. > >> > >> Things like "avoid current traffic jams" would require 'net access > >> anyway. > > > > sure but general "it's 5:30pm and its a good idea to avoid road X > > because statistically its jammed around that time" can be part of > > your road data set. :) > > > >> On the other hand, things like "favour routes near reliable > >> sources of water" would be good for me. Though I doubt that data > >> would be available. > > > > sure... roads near the ocean will do :) > > Hum, a better option will be drinkable water ! Ocean isn't that nice > to drink :-) Not to mention salt water crocodiles, blue ringed octopi, sea wasps, and aquatic drop bears. Being near the ocean can be hazardous. -- A big old stinking pile of genius that no one wants coz there are too many silver coated monkeys in the world.
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