On Saturday 29 December 2018, Joseph Eisenberg 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 think this discussion has already been made in the past.  The majority 
of mangroves that are mapped are mapped inside the coastline (on 
land) - primarily because the outer edge of the mangroves is well 
verifiable while the high water mark on ground level inside the 
mangroves is not.  Formally it would depend on if you consider the high 
water mark to refer to ground level or canopy level.

> 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.

Rendering mangroves with a fill color has already been discussed in:

https://github.com/gravitystorm/openstreetmap-carto/pull/1497
https://github.com/gravitystorm/openstreetmap-carto/issues/2025

-- 
Christoph Hormann
http://www.imagico.de/

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