[Tagging] natural=bay on areas

Kevin Kenny kevin.b.kenny+osm at gmail.com
Mon Mar 27 14:07:31 UTC 2017


I don't think it does to be too fussy about what is 'river' and what is
'sea' and what is 'estuary'.

Near where I live, a hydrologist would classify the Hudson River as
'estuary' as far as http://www.openstreetmap.org/way/90929525 because it
has a measurable tide right up to that point. Nevertheless, it's fresh
water (the salt front is at least 100 km downstream even in a dry summer),
The actual meeting of river (which, by then, is indeed salt) and ocean is
another 100 km downstream from there.

The locals would be astonished if you were to claim that the bank of the
Hudson River is 'seacoast', even if it has a tide and ships of considerable
size can navigate the river as far as the Port of Albany. A hydrologist
would say, "well, technically, that's correct" and the locals would roll
their eyes.

On Mon, Mar 27, 2017 at 10:05 AM, Kevin Kenny <kevin.b.kenny at gmail.com>
wrote:

> I don't think it does to be too fussy about what is 'river' and what is
> 'sea' and what is 'estuary'.
>
> Near where I live, a hydrologist would classify the Hudson River as
> 'estuary' as far as http://www.openstreetmap.org/way/90929525 because it
> has a measurable tide right up to that point. Nevertheless, it's fresh
> water (the salt front is at least 100 km downstream even in a dry summer),
> The actual meeting of river (which, by then, is indeed salt) and ocean is
> another 100 km downstream from there.
>
> The locals would be astonished if you were to claim that the bank of the
> Hudson River is 'seacoast', even if it has a tide and ships of considerable
> size can navigate the river as far as the Port of Albany. A hydrologist
> would say, "well, technically, that's correct" and the locals would roll
> their eyes.
>
>
>
> On Mon, Mar 27, 2017 at 9:28 AM, Christoph Hormann <osm at imagico.de> wrote:
>
>> On Monday 27 March 2017, Andrew Harvey wrote:
>> > > It is a bay of the Tasman Sea/Pacific Ocean.  Ecologically it is a
>> > > fully
>> >
>> > maritime waterbody.
>> >
>> > What do you mean by "maritime waterbody"?
>>
>> A waterbody where plant and animal life matches or is close to that of
>> the sea rather to that of a river or lake.
>>
>> > Botany Bay is unlike many conventional bays which are on the
>> > coastline and part of the sea. You're right that these types of bays
>> > are part of the sea and ocean, and other times they are part of a
>> > river, but botany bay is really a river nor sea, if anything Botany
>> > Bay sounds much more like an Esturary.
>> > https://en.wikipedia.org/wiki/Estuary
>>
>> In OSM we have no separate tagging for estuaries, this would not make
>> sense because it would just introduce yet another boundary problem
>> (where the river turns into the esturary and where the esturary turns
>> into the ocean).  An esturary is the transit of a river into the ocean.
>> If you consider the Botany Bay to be part of the esturary of Georges
>> River you still have to decide where you place the coastline and if you
>> place it below the bay you have to tag the bay waterway=riverbank or
>> natural=water + water=river.  Creating a separate waterbody that is not
>> part of the river but within the coastline is wrong in our current
>> tagging scheme.
>>
>> Note in general the esturary of Georges River would be considered to
>> start much further upstream, likely somewhere around here:
>>
>> https://www.openstreetmap.org/#map=15/-33.9765/151.0237
>>
>> at the transit from a meandering river to a ria
>> (https://en.wikipedia.org/wiki/Ria).
>>
>> --
>> Christoph Hormann
>> http://www.imagico.de/
>>
>> _______________________________________________
>> Tagging mailing list
>> Tagging at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/tagging
>>
>
>
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