[OSM-talk] OSM maps on Garmin GPS
raphael Jacquot
sxpert at sxpert.org
Tue Nov 21 16:18:30 GMT 2006
SteveC wrote:
> * @ 21/11/06 02:12:10 PM schuyler at nocat.net wrote:
>> * On 21-Nov-2006 at 5:32AM PST, raphael Jacquot said:
>>>> You make it sound like magic. What is the essential algorithm or
>>>> data structure in PostGIS that causes this speed-up? Could the
>>>> same speed be achived with the GIS extensions to MySQL? Could it
>>>> be achieved by changing the old OSM tile generation code on top of
>>>>
>>> simple...
>>> the r-tree based GIST index on bounding boxes that's applied on the
>>> geometry column :D
>> MySQL 5.0 claims to support R-tree based spatial indexing:
>>
>> http://dev.mysql.com/doc/refman/5.0/en/optimizing-spatial-analysis.html
>>
>> Haven't used it, so can't say how efficient it is. I've been in
>> favor of backing OSM with a proper spatial database from day one, so I
>
> For any reason other than a hunch?
>
> I thought nick hill disproved all this?
>
> have fun,
>
> SteveC steve at asklater.com http://www.asklater.com/steve/
>
well, lets put it this way, necessity is the mother of invention.
if people came up with this, there must be a good reason, such as
"yikes, it's faster".
what would have been the reason if it didn't give any advantage over the
regular thing ?
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