[OSM-talk] OSM maps on Garmin GPS

[Lars Aronsson]

Mikel Maron wrote:
> I can see some tie ins with the new tiling infrastructure. For 
> mapnik, queries are run against a PostGIS database (populated 
> from planet.osm) which is part of the reason why it's so fast.

You make it sound like magic.  What is the essential algorithm or 
data structure in PostGIS that causes this speed-up?  Could the 
same speed be achived with the GIS extensions to MySQL?  Could it 
be achieved by changing the old OSM tile generation code on top of 
the regular MySQL?


-- 
  Lars Aronsson (lars at aronsson.se)
  Aronsson Datateknik - http://aronsson.se