[Tagging] Tagging mangroves over water?

Alan Mackie aamackie at gmail.com
Sat Dec 29 01:55:23 UTC 2018

On Fri, 28 Dec 2018 at 20:30, Joseph Eisenberg <joseph.eisenberg at gmail.com>

> Have you seen any areas of mangroves tagged over water? That is,
> outside of the coastline or over natural=water or waterway=riverbank
> areas?
> I would like to be able to render mangroves with a fill color, as with
> wetland-swamp, a similar environment. But this will case a large
> change in the appearance of the coastline if many areas have been
> tagged outside of the coastline, over the water.
> Generally I have been mapping mangroves with the limit of the
> trees/shrubs as the coastline, as recommended on this list a few
> months ago. This appears to be similar to how most swamps are mapped,
> even though a swamp may actually be mostly flooded.
> The wiki page does not clearly specify this, but it does seem to imply
> that mangroves are mapped over land, as it recommends using a
> multipolygon if there are areas of open water or "other land" within
> the mangrove - implying that mangroves are a type of "land".
> https://wiki.openstreetmap.org/wiki/Tag:wetland%3Dmangrove
> - Joseph
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As they are tidal and the OSM wiki doesn't even count the part of the beach
that gets wet as beach [1] (despite the picture). I would expect mangrove
to be (almost) entirely on the "wet" side of the coastline.


1 : https://wiki.openstreetmap.org/wiki/Tag:natural%3Dbeach
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