[Tagging] Coastline for rivers, estuaries and mangroves?

Joseph Eisenberg joseph.eisenberg at gmail.com
Wed Sep 5 14:39:14 UTC 2018

Specific examples:

1) This changeset on the River Dart in southwest England was the
source of the Help site question:

It looks like quite a large estuary, much wider than the non-tidal
part of the river upstream. User keithonearth, who made the edit, was
looking for discussion on this. (It looks like this was just discussed
on the GB list as well:

2) The estuaries and mangrove tidal channels in this area:

I previously changed the coastline to be closer to the river mouths in
another section of coast to the southeast, but perhaps I should change
it back? The whole idea of coastline around mangrove swamps is most
confusing. I don't think the mangroves should be outside of the
coastline, but where then should it be?


> Date: Wed, 5 Sep 2018 09:29:03 +0200
> From: Christoph Hormann <osm at imagico.de>
> To: "Tag discussion, strategy and related tools"
> 	<tagging at openstreetmap.org>
> Subject: Re: [Tagging] Coastline for rivers, estuaries and mangroves?
> Message-ID: <201809050929.03882.osm at imagico.de>
> Content-Type: text/plain;  charset="utf-8"
> On Wednesday 05 September 2018, Joseph Eisenberg wrote:
>> Colin and Christoph, could you give some guidance about a couple of
>> the specific situations that I brought up in the original post?
>> First, in the question on the help Q&A board, the other mapper wanted
>> to remove the coastline from tidal parts of rivers in England , so
>> that the end of the waterway=river would meet the coastline. It looks
>> to me that this is contrary to standard mapping in England and many
>> other places. But I can see why some people look at the waterway line
>> out beyond the coastline and feel it needs the river area mapped.
> I think you need to give specific examples for a meaningful discussion
> here.
>> It seems like this would be reasonable, if the coastline is
>> considered to map the furthest inland limit of the marine environment
>> (at high tide), and the river area plus the line of the waterway are
>> mapping the longest extention of the river.
> To be clear:  The upper limit of tidal influence on water levels and the
> ecological limit of the marine environment are two very different
> things.  Tidal influence often goes much further upstream - as
> illustrated by Kevin's example.
> --
> Christoph Hormann
> http://www.imagico.de/

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