[Tagging] Tagging mangroves over water?

Warin 61sundowner at gmail.com
Sat Dec 29 03:25:53 UTC 2018

Here is an example of mangroves over a river
Way: 49405103

P.S. the wiki says 'wetlands' can only be a closed way.
Unfortunately in some cases they have to be multipolygon relations.

On 29/12/18 12:55, Alan Mackie wrote:
> On Fri, 28 Dec 2018 at 20:30, Joseph Eisenberg 
> <joseph.eisenberg at gmail.com <mailto:joseph.eisenberg at gmail.com>> wrote:
>     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.
> -Alan
> 1 : https://wiki.openstreetmap.org/wiki/Tag:natural%3Dbeach
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