[Tagging] Rio de la Plata edit war

muralito at montevideo.com.uy muralito at montevideo.com.uy
Mon Aug 3 18:48:00 UTC 2020

> De: "Alan Mackie" <aamackie at gmail.com>
> Para: "Tag discussion, strategy and related tools" <tagging at openstreetmap.org>
> Enviados: Sábado, 1 de Agosto 2020 13:26:06
> Asunto: Re: [Tagging] Rio de la Plata edit war

> On Sat, 1 Aug 2020 at 07:21, Paul Norman via Tagging < tagging at openstreetmap.org
> > wrote:

>> On 2020-07-31 8:21 a.m., Andy Townsend wrote:

>>> On 26/05/2020 00:20, Alan Mackie wrote:

>>>> Has this edit war stabilised?

>>>> Apparently it has been blocking coastline updates across the whole world for
>>>> months now.

>>>> https://osmdata.openstreetmap.de/data/land-polygons.html
>>>> https://github.com/fossgis/osmdata/issues/7

>>> (picking this thread up again because there still hasn't exactly been a meeting
>>> of minds here)

>>> land polygons have been generated (see
>>> https://osmdata.openstreetmap.de/data/land-polygons.html ) and
>>> https://github.com/fossgis/osmdata/issues/7 has been resolved by manually
>>> "releasing" the coastline. The current situation in OSM is
>>> https://overpass-turbo.eu/s/WD8 - at the time of writing this the coastline
>>> crosses the river north of Buenos Aires.

>>> However, edits are continuing (see
>>> https://www.openstreetmap.org/changeset/88787419 ). I'm not convinced that
>>> moving to one of two extremes, even a small amount at a time, is a good idea
>>> until there's actually been discussion between the proponents of the various
>>> positions.

>>> For what it's worth, neither extreme position looks the best answer to me -
>>> looking at the salinity change between river to ocean at
>>> https://www.sciencedirect.com/science/article/pii/S0307904X07000716 (see
>>> https://www.sciencedirect.com/science/article/pii/S0307904X07000716 for the key
>>> picture) and looking at
>>> https://de.wikipedia.org/wiki/Datei:Rio_de_la_Plata_BA_2.JPG suggests a
>>> location some way between the two. Despite the NASA photo it looks like there
>>> isn't a "step change" in salinity - and of course values will fluctuate based
>>> on winds and tides etc
>> I live near the coast and have done coastline processing, including a great deal
>> worldwide during the redaction.

>> Salinity and territorial control have seldom been considerations in where the
>> break between water mapped as waterway=riverbank and natural=coastline that I
>> have seen. The break is chosen as a convenient place for mappers and a common
>> view of where the coast of the ocean is, not based on scientific salinity
>> criteria. For territorial control, look at all the inlets along the BC or
>> Norwegian coasts.

> Perhaps I am an overly literal follower of the wiki, but I had always assumed
> the coastline should continue inland as far as the tide continues to be
> noticeable. Mediterranean mapping might be an issue, but elsewhere I think this
> is fairly clear?

> If the water is fresh or the waterway still appears to be a river, canal etc,
> then it seems reasonable that they should also have those tags as well. The
> coastline and riverbank tags aren't fighting for a common key, so it's not a
> direct tagging conflict.

> As for territorial control, there are archipelagic states with territorial
> waters despite large gaps between all their islands. I'm not sure why inlets or
> bays pose a problem?

there is no noticeable tides. tides here are meterological, not astronomical. e.g the river between Buenos Aires and Colonia is 3m depth average, with a few channels to navigate. if you are not cautious, with a change of wind the water withdraws and your sailboat remains in the mud without notice. 



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