[mkgmap-dev] [PATCH v3] - beware of the bollards!

Wed Jul 8 08:07:29 BST 2009

Hi WessexMario,

> As a map user and data contributor I get frustrated by the lack of 
> resolution. I'm not sure exactly where in the map rendering process the 
> detail being discussed here lies, but it would be my preference to 
> resolve  nodes down to 1m. There are plenty of instances where complex 
> junctions have many roads, footpaths, gates, bollards, cattle grids and 
> stiles all within a 10m radius, on both sides of a country road, 
> expanding the resolution to 25m would make a mess of carefully plotted 
> features and make it even more difficult to render at the highest zoom.
> If the rendering produces a cluttered map, then that's a rendering 
> issue, but for routing, complex junctions need fine resolution.

Yeah, but look at the figures. The Garmin coordinates are 24 bits
so the angular resolution is 360/2^24 - using a circumference of
40,075Km, that yields a resolution of 2.388m.

Cheers,

Mark