On Fri, Sep 12, 2008 at 08:20:18AM +0200, Andreas Kalsch wrote: > Subject: Re: [OSM-dev] Spatial vs. multi-column indexes for points > > > On Thu, Sep 11, 2008 at 08:31:23PM +0200, Andreas Kalsch wrote: > > > All, thanks for your quick responses! > > > > > > Quad tiles look like a smart way to create an index. So to lookup a > > > single point or a quad tile, this is fine. But for my application I > > > need another lookup - by bounding box with any ratio and size. Is > > > there a way to look up a special bounding box with this index? I > > > think this will be a little more complicated without conventional > > > multi-column indices. Hmm, I think you could take a maximum number > > > of quad lookups which contain the requested box, what do you think? > > > > The code in the api calculates all possible quadtile areas and does a > > quadtile in ( x, y, z, a, b, c, d, e, f ) or quadtile between x and y > > etc > > Can you give me the position of this code in SVN, I am sure will understand > it more deeply then.
applications/utils/export/osm2ai/osm2ai.pl
Is a perl variant - look for "sql_for_area"
In the rails_ports its done with a C helper - look in
sites/rails_port/lib/quad_tile/
Flo
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Florian Lohoff [EMAIL PROTECTED] +49-171-2280134
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