[Talk-GB] Coastline and tidal rivers

[David Groom]

Colin

whilst in theory I'd say yes, in practice I'd say consensus is hard to 
achieve.

David



------ Original Message ------
From: "Colin Smale" <colin.smale at xs4all.nl>
To: talk-gb at openstreetmap.org
Sent: 28/08/2018 12:23:33
Subject: Re: [Talk-GB] Coastline and tidal rivers

>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.smale at xs4all.nl>
>>To: "Talk-GB" <talk-gb at 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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