[Talk-ca] Merging canvec data into existing lakes

[Samuel]

Awesome, thanks.

Sam

On 10-11-18 09:41 PM, Adam Dunn wrote:
> This kind of depends on quality of each source (has the lake been 
> modified since either OSM or Canvec traced it?).
>
> I'll assume you're talking about a case where Canvec has better 
> positional data than OSM, but you don't want to wipe out OSM 
> completely, or it could be a while before you import the lake in other 
> tiles (some lakes can span many Canvec tiles and we don't want 
> "half-lakes" on our maps!)
>
> First check the lake in OSM to make sure there aren't any interesting 
> tags that could get lost (boat launches, alternative names, etc.)
>
> If there's nothing of particular interest in OSM currently, what I do 
> is "split" (keyboard command 'p' in josm) the lake in OSM and Canvec 
> at the boundary of the tile, then delete the OSM data in the tile I'm 
> importing, and the line of the lake along the boundary in Canvec. So 
> instead of having two closed lakes (two "O" figures"), I now have two 
> non-closed lakes (one will be a "U" shape, the other an upside-down 
> "U"). Then merge the nodes (keyboard 'm') and combine the ways 
> (keyboard 'c').
>
> In the end you'll have one lake that is using Canvec data where you 
> just imported, and original OSM data where you haven't yet. When you 
> get around to importing the other areas, you split/merge/combine again 
> so the whole lake is now Canvec sourced.
>
> Adam
>
> On Thu, Nov 18, 2010 at 4:00 PM, Samuel <samueldyck at gmail.com 
> <mailto:samueldyck at gmail.com>> wrote:
>
>     Hi
>
>     How would I take canvec lake data into already mapped lakes that
>     stretche outside the canvec tile?
>
>     Sam
>
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