[OSM-dev] Osmosis: Subtiling the planet with nice ways proposal

[Karl Newman]

On Jan 15, 2008 12:34 AM, Lambertus <osm at na1400.info> wrote:

> Steve Ratcliffe wrote:
> > One thing to add is that ideally you want to split tiles so that they
> are
> > smaller where there is more detail and larger elsewhere.  If you look at
> > the map viewer on the Garmin web site, for example - Metro Guide Europe,
> > you can see the tile outlines.  Over London they are much smaller than
> > anything we do, although there is just one tile over much of Wales. Of
> > course they have more data.
> >
> True, the current 'hard' 0.25 sq tilesize isn't optimal (though
> necessary to hold the Rotterdam area), but that is simply a matter of
> defining my bboxes differently and does not solve the actual problem
> where ways are missing on tileborders.
>
> On the other hand; if there is no problem with the tile crossing ways
> then there seems no real reason not to use the small square size: Units
> with much storage space don't suffer and units with limited storage have
> the advantage of a fine grained tileset (so you can travel further
> without running out of space possibly).
>
> There's still a limitation on Garmin units with microSD slots. You can't
have more than 2025 map sections on current units or things start to go
funny (maps not redrawing correctly, cities incorrectly listed, sometimes
lockups). As it is, Garmin's commercial map (MetroGuide Europe) has 2367
sections, so you can't use their entire map set on your GPS. So, for newer
units with expandable memory, larger sections are better (to a point).
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