[OSM-talk] OSM maps on Garmin GPS

[Andy Robinson]

raphael Jacquot wrote:
>Sent: 21 November 2006 4:19 PM
>To: SteveC
>Cc: talk at openstreetmap.org
>Subject: Re: [OSM-talk] OSM maps on Garmin GPS
>
>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 ?
>

I don't know, in my experience people do things just to be different and to
try and gain an advantage over their competition.

Cheers,

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

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