[Routing] Binary file format

[Andreas Brauchli]

On Mon, 2007-12-10 at 22:50 +0100, Adrian Stabiszewski wrote:
> > Yes, a binary-format would be a great thing to have. I don't quite see
> > what you mean with junction-node but maybe you could do a first outline
> > of a format or a list of reqirements that you see for it.
> > We could start from there.

garmin uses a binary format that makes sense for saving all kind of POIs
and streets and it also uses this for routing, not sure if it's
optimized for routing though. it can save several layer of precisions
(you don't want footways to appear on global scale) but you'd need this
for routing your walk from Canada to Mexico.
would this format be for routing only or also for map-display? (maybe
with pre-computed paths (pathtrees) on highways or frequently used roads
for every region)

i think mkgmap's creator would be the most useful resource on this.

andreas