[Talk-ca] Simplifying CanVec imports

[john whelan]

There are always issues when you want to replace one set of data with
another.  People may have added labels such as the name in French, replace
the import and you lose the French.

Where the CANVEC tiles meet ways are connected by overlapping points.  Any
simplification at this point that moves a point on a way means the way
doesn't get joined where the tiles meet.

This is why it''s so tempting to start over from CANVEC 7 then add in the
detail, amenities, shops etc.  At least you can have confidence that the
road names are correct.

Cheerio John

On 13 February 2011 17:30, Samuel Longiaru <longiaru at shaw.ca> wrote:

>  I haven't seen any issues with the simplify tool breaking joins or any
> errors introduced by its use in the data sets I've been importing but then
> I've only been applying it to water features... again, just to get the data
> size for streams down to something reasonable.  No other features seem to
> need it.
>
> Maybe I don't understand the process, but I can't see how simplifying now
> would have any effect on future imports.  If future versions of CanVec were
> provided only as some sort of diff file, and new ways relied on the
> existence of certain nodes in a previous data set, then I could see a
> potential problem developing.  But otherwise, I don't see how it would cause
> any problems for future updating.
>
> Sam
>
>
>
> -----Original Message-----
> *From*: Adam Dunn <dunnadam at gmail.com<Adam%20Dunn%20%3cdunnadam at gmail.com%3e>
> >
> *To*: Samuel Longiaru <longiaru at shaw.ca<Samuel%20Longiaru%20%3clongiaru at shaw.ca%3e>
> >
> *Cc*: talk-ca at openstreetmap.org
> *Subject*: Re: [Talk-ca] Simplifying CanVec imports
> *Date*: Sun, 13 Feb 2011 11:37:40 -0800
>
> Does simplifying like this cause issues where one feature joins up
> with another feature? I'm assuming that JOSM won't move end nodes of
> ways during simplification, so rivers connecting to lakes should be
> okay, but what about places where there is a common node in the middle
> of a way? Are there instances of this in Canvec, or does the Canvec
> conversion process always split ways where there are nodes common to
> more than one object?
>
> If you simplify ways today, how will that affect imports in the
> future, when the next version of Canvec comes out?
>
> Adam
>
>
>
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