[OSM-dev] Reverse geocoding - nearest nodes vs areas
Marcus Wolschon
Marcus at Wolschon.biz
Tue Aug 11 05:29:26 BST 2009
On Tue, Aug 11, 2009 at 12:13 AM, Michael Handerek<osm at handerek.net> wrote:
> Hi,
>
> I played a little bit with different ideas and concepts to realize a
> reverse geocoding tool. I also found some existing implementations like
> the namefinder and the navigation subsystem of traveling sales man. I
> noticed that all solutions search for tagged nodes and ways in specified
> max. distance.
See the AdvancedAddressDB. Areas are used whereever possible.
Nodes are just a fallback.
> In my opinion, checking if a point is part of an area geometry is more
> precise than setting a marginal distance for the nearest tagged nodes,
> isn't it? But what about the performance aspect, nearest node vs area?
Performance-wise I am building an index of names to polygon-ways/nodes
to avoid such queries. (In Traveling Salesman)
Marcus
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