On Mon, 2 May 2011, Cedric BAIL 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 :-)
an ocean of wine (Bordeaux, like Haut-Brion, Sauterne, etc...), hmm
Vincent
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