David, do you consider that it would be advantageous to have consensus
on this matter, and a consistent tagging paradigm in OSM? I am not
prejudging what that consensus position might be, just sounding out if
there is any point in having the discussion in the first place.
On 2018-08-28 13:09, David Groom wrote:
> There is no consensus.
>
> Personally I'm not in favour of the view that any body of water which is
> tidal should be bounded by a way tagged as coastline.
>
> Reasons for this
>
> 1) Ask any one who lives in say central London "do you live on the coast" or
> do you live beside a river", most would I'm sure say beside a river, so
> surely our data should reflect that. I think this probably is what you mean
> by "seems more natural"
>
> 2) In part because the converse is not true, we bound large non tidal water
> areas as coastline
>
> 3) If knowledge that a body of water is tidal is important it can be tagged
> "tidal = yes"
>
> David
>
> ------ Original Message ------
> From: "Colin Smale" <colin.sm...@xs4all.nl>
> To: "Talk-GB" <talk-gb@openstreetmap.org>
> Sent: 28/08/2018 08:49:01
> Subject: [Talk-GB] Coastline and tidal rivers
>
> That old chestnut again...
>
> There seems to be an open discussion about how far up a river the
> natural=coastline should go. The wiki suggests the coastline should be the
> high water line going up to the tidal limit (often a lock or a wier) but this
> can be a substantial distance inland. This is AIUI the general scientific
> approach.
>
> There has been some discussion in the past about letting the coastline cut
> across the river at some convenient point, possibly because it "looks better"
> or "seems more natural" or "is less work."
>
> I looked at a few rivers along the south coast to see how they had been
> tagged and it seems most have the coastline up to the tidal limit. However
> the coastline around the mouth of the Dart has recently been modified to cut
> across the mouth, and Salcombe Harbour is also mapped this way.
>
> Is there a consensus for a particular definition of "coastline" in tidal
> estuaries? Should we try to keep a consistent paradigm, or doesn't it matter?
>
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