map routing database on phone
ewanm89 at googlemail.com
Sat Apr 12 11:44:16 CEST 2008
On Fri, 11 Apr 2008 18:44:43 +0200
Schmidt András <asch at freemail.hu> wrote:
> I am developing an open source map viewer (GPS) application that will
> work on the OpenMoko platform in Java (http://www.yamamap.org/). It
> has an own map format, it can convert openstreetmap.org maps and it
> has a converter for Garmin img format maps too.
> Now I am thinking of implementing routing so that he program could
> propose a route and tell the driver where to turn the car. I am only
> thinking of offline solutions. I have done some brainstorming on what
> must be implemented to let it be usable
> (http://yamamap.wiki.sourceforge.net/concept-routing). It would be
> nice to generate a storm in your minds too - it is an interesting
> My question is how would you implement a routing engine so that it
> can work efficient on huge slices of OSM (and other) maps even for
> big distances. These maps are cut from the full OSM planet (that is
> now about 3G in xml.bz2 format) and one phone owner could have huge
> areas on the phone offline. So it is obvious that we have to process
> that data clever to be efficient!
> In my opinion source and target selection by name and routing itself
> would require a database or at least an indexing service. So cities
> could be searched by name.
> The question is what database or indexer should be used. The aspects
> - lightweight enough for the limited power of portable devices
> - Reachable from Java
> - Let the indexes be built on the desktop computer and copied on the
> PDA's flash memory card directly
> - The PDA can also add indexes (insert custom POI's name or install
> a new map without the use of the computer)
> - portable: so it can be used on Windows XP or even on Windows
> Mobile later
> What database would you use? I was thinking of:
> - Java DB (http://developers.sun.com/javadb/)
> - Just an indexer - apache Lucene
> - A native database - mysql or postgresql
> Happy hacking!
> Schmidt András
sqlite (http://www.sqlite.org/)? It's a lightweight, single file db.
Ewan Marshall (ewanm89/Cap_J_L_Picard on irc)
Geek by nature, Linux by choice.
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