[Tagging] Where should

Leif Rasmussen 354lbr at gmail.com
Thu Aug 15 06:50:24 UTC 2019


*Was Re: [Tagging] Definition of a Beach*

*> that then clashes with OSM Coastline, which is taken as the High Tide
mark*

I was under the impression that the definition of the coastline was the
average between high and low, not the high tide mark, based on what I had
read on some wiki page.  I think that there must be conflicting guidelines
on the wiki since I've noticed two conflicting mapping styles.

What style do people think is better?  Is there an advantage to one over
the other?

Also, is there a good way to map the coastline as an area representing the
low tide to high tide difference?  Adding some tag like tidal=yes to areas
representing that shape is the best I've found, but tidal=yes can also be
used to mark that some water or marsh is tidal.

Thanks,
Leif Rasmussen



On Thu, Aug 15, 2019, 8:02 AM Graeme Fitzpatrick <graemefitz1 at gmail.com>
wrote:

>
> On Thu, 15 Aug 2019 at 14:50, Warin <61sundowner at gmail.com> wrote:
>
>> On 15/08/19 14:16, Mateusz Konieczny wrote:
>>
>> Main problem with such definition is that strip of concrete/asphalt along
>> shore
>> is not a beach.
>>
>> I thought about dunes when I claimed that "beach is not
>> always unvegetated" but now I see that dunes are not considered as part
>> of the beach.
>>
>> I copied definition from Wikipedia as it seemed far better as it managed
>> to
>> exclude stuff like
>> https://commons.wikimedia.org/wiki/File:Sea_defences_(21467789266).jpg
>>
>>
>> https://commons.wikimedia.org/wiki/File:Mole_in_Funchal,_Ponta_do_Garajau,_statue_of_Cristo_Rei_and_Desertas_Islands._Madeira,_Portugal.jpg
>>
>>
>> https://commons.wikimedia.org/wiki/File:Concrete_defences_by_the_Saxon_Shore_way_-_geograph.org.uk_-_1240179.jpg
>>
>> Maybe copying previous definition from natural=beach would be preferable.
>>
>>
>> Don't know .. hence my question here .. any 'beach' 'experts'?
>>
>
> Lived beside them all my life so I'll have a go!
>
> I'll agree with Mateusz that concrete & boulders aren't a beach - a couple
> of those examples I'd probably call man_made=groyne + natural=rock (& yes,
> that's because it then renders as rock!), however you can have (isolated)
> boulders on a beach.
>
> What is a beach though is a bit tricky, especially for OSM.
>
> It would usually be "the area above the Low Tide mark" but that then
> clashes with OSM Coastline, which is taken as the High Tide mark, so that
> would then have to mean that the beach is
>
> "The area between the High Tide mark & any adjoining vegetation /
> structures / landforms". It's usually largely unvegetated (but may have
> isolated trees, clumps of grass etc), & is made up of natural materials
> such as sand, pebbles, shells etc"
>
> How's that sound?
>
> Thanks
>
> Graeme
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