[Loadstone] Id Dispensability

Przemysław Rogalski Rogalski at o2.pl
Tue Feb 27 18:00:40 GMT 2007


OK, I understand your argumentation and I find it clear. Thank you!
----- Wiadomość oryginalna ----- 
Od: "Shane" <shane at cm.nu>
Do: "General discussion pertaining to the Loadstone GPS program" <loadstone at loadstone-gps.com>
Wysłano: 27 lutego 2007 17:55
Temat: Re: [Loadstone] Id Dispensability


> On Tue, Feb 27, 2007 at 12:45:40PM +0100, Przemys?aw Rogalski wrote:
>> Is such kind of data really necessary in POI files?
>> Wouldn't it be enough (and more practical) for Loadstone
>> to differentiate (esp. duplicated) points just by their
>> names and coordinates?
> 
> The id needs to be there and the various converters do
> their best to generate unique IDs.  However, if you are
> generating your own files from other sources, you've gotta
> take care of ids under your userid.  If the various sources
> out there for which the converters were written would allow
> redistribution of their data, this would be less of an
> issue as the data could be imported once and made available
> to everyone.  Therefore, I would suggest contacting data
> sources to that effect if it is practical to do so.
> 
> The reason we cannot have a primary key on
> name,latitude,longitude is all of that data is dynamic.  If
> someone renames a point, the name changes and without an
> id, there is no way to detect the rename.  The coordinates
> can also change via the update point feature and there is
> no reason why all of this data couldn't change before an
> upload to the PSE.  The id is rather like an anchor and no
> matter what you do with a point, the id will never change.
> 
> Hth,
> Shane
> 
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