[OSM-dev] curves

[Martijn van Oosterhout]

On Jan 3, 2008 6:29 PM, Artem Pavlenko <artem.mapnik at googlemail.com> wrote:
> No. PostGIS doesn't support beziers. But spatial queries like
> 'intersect', 'within' are usually implemented as two step process:
> 1. check if  geometry bbox intersects query bbox
> 2. refine query based on results from (1).

I think if you defined a POLYLINE in such a way that every second
point is a control point then I think that would be efficient to store
and draw and all the existing infrastructure will probably just work
fine... IIRC the curve is then bounden by lines joining the base
points and the control points.

Note: the patent posted talks about storing *altitude* data or roads
this way and thus doesn't apply in this situation.

Have a nice day,
-- 
Martijn van Oosterhout <kleptog at gmail.com> http://svana.org/kleptog/