[Tagging] coastline v. water

Christoph Hormann osm at imagico.de
Wed Nov 18 22:04:00 UTC 2020

> Eric H. Christensen via Tagging <tagging at openstreetmap.org> hat am 18.11.2020 21:19 geschrieben:
> [...]

First: the matter has been discussed at length previously so i would advise anyone who wants to form an opinion on the matter to read up on past discussion where essentially everything relevant has been said already.  Most relevant links:

and resulting discussion:



> Now, some of the feedback that has been presented[2] is that because it is tidal it is part of the sea.  [...]

As you can read in the proposal linked above the range of tidal influence forms the upper limit of the range practical coastline mapping in areas with significant tidal range but as it is in practical mapping not the universally used limit.


While this is ultimately not relevant because the delineation of tags in OSM should be based on verifiable criteria obviously i have never seen any map that displays ocean water and inland waterbodies in differentiated form that shows the Chesapeake Bay as inland water.

Classical examples with differentiated rendering are TPC/ONC (caution: links go to large images):


Christoph Hormann 

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