[Loadstone] Id Dispensability

Shawn Kirkpatrick shawn at odyssey.cm.nu
Thu Mar 1 00:16:38 GMT 2007


What you say about checkpoints is true. There needs to be a bit of work done 
on this file, it should really store all the needed information about a 
point so a database lookup isn't needed. Something to put in at some point.

On Wed, 28 Feb 2007, Cathomas Jürg wrote:

> ;someone renames a point, the name changes and without an
> ;id, there is no way to detect the rename.
> i wonder why you do not use the id for checkpoint files as well?
> now, if you update a points coordinates, you'll loose the checkpoint definition for this point.
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: loadstone-bounces at loadstone-gps.com [mailto:loadstone-bounces at loadstone-gps.com] Im Auftrag von Shane
> Gesendet: Dienstag, 27. Februar 2007 17:55
> An: General discussion pertaining to the Loadstone GPS program
> Betreff: 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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