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-) 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. 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. -- 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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