Eric, I don't think the previous discussion is quite as inconclusive as your evaluation.
While it is true that there is not widespread agreement on where the natural=coatline ways should transect a river mouth or river estuary, there is nearly universal agreement that marginal seas, including bays, are mapped with the natural=coastline. Using the rendering at https://www.openstreetmap.de/karte.html - which differentiates the marine water polygons outside of the coastline from lakes and rivers, by using slightly different colors, we can see how bays are mapped in other parts of North America and the world. For example, check out Delaware Bay, just up the coast from your area: https://www.openstreetmap.de/karte.html?zoom=10&lat=39.14649&lon=-75.07302&layers=B000 - it is mapped as a natural=bay with natural=coastline around it, not natural=water Upper and Lower New York Bay are mapped as bays outside of the natural=coastline - you can see the line where the waterway=riverbank area starts just at the north end of Manhattan island (though this placement is somewhat controversial) - https://www.openstreetmap.de/karte.html?zoom=10&lat=40.63628&lon=-73.93525&layers=B000 Tampa Bay: https://www.openstreetmap.de/karte.html?zoom=10&lat=27.80801&lon=-82.63368&layers=B000 - outside of the natural=coastline Galveston Bay: https://www.openstreetmap.de/karte.html?zoom=10&lat=29.49869&lon=-94.94249&layers=B000TT - outside of the natural=coastline San Francisco Bay and connected bays: https://www.openstreetmap.de/karte.html?zoom=10&lat=37.79939&lon=-122.06911&layers=B000TT - outside of the coastline Puget Sound - while Lake Washington on the east side of Seattle is natural=water, also most of the ship canal connecting them: https://www.openstreetmap.de/karte.html?zoom=11&lat=47.59544&lon=-122.39252&layers=B000 I would like to request that the tidal channels and estuaries around Chesapeake Bay be re-mapped with natural=coastline. If you wish to keep the natural-water polygons for the estuaries that is not a problem. But it would be contrary to normal practice to map the main body of Chesapeake Bay as natural=water because it is clearly part of the sea - there is no barrier between it and the open ocean, since there is an open channel through US 13 where the tunnel is. While it is an estuary by hydrological definitions, so are the Baltic Sea and all fjords and Puget Sound and San Francisco Bay - all of which are mapped as outside of the natural=coastline. Also please consider that the community here approved the proposal for waterway=tidal_channel which said that the area of tidal channels (aka tidal creeks) should be mapped with natural=coastline at their edges - see https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dtidal_channel#How_to_Map and https://wiki.openstreetmap.org/wiki/Proposed_features/Tag:waterway%3Dtidal_channel - most of the "creek" features along the Bay are tidal channels. -- Joseph Eisenberg On Thu, Nov 19, 2020 at 6:46 AM Eric H. Christensen via Tagging < tagging@openstreetmap.org> wrote: > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Wednesday, November 18th, 2020 at 11:34 PM, Brian M. Sperlongano < > zelonew...@gmail.com> wrote: > > > This was fascinating reading. I do agree that we ought to have a > definition for what gets tagged natural=coastline, and I think it's fine if > that definition has some subjectivity. > > > > I would offer something as simple as: > > > > "The coastline should follow the mean high tide line. In some cases > this rule would result in the coastline extending an unreasonable distance > along the banks of tidal rivers. In those cases, mappers should identify a > reasonable choke point at which to terminate the inland extent of coastline > tagging." > > I would just classify it as "where the ocean meets the land". Any other > water that isn't ocean should be mapped as water and tagged appropriately. > That makes the map more accurate and detailed. > > R, > Eric > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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