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 :-)
-- 
Cedric BAIL

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