Am Mo., 27. Jan. 2020 um 11:21 Uhr schrieb Colin Smale < colin.sm...@xs4all.nl>:
However, practically this leeds to ambiguous situations, where for example admin_level=4 is added to islands and might be misinterpreted as administrative "standalone" level 4 entities (with the island name etc.). While a clear separation of administration and coastline could solve this, it would still mean continuous additional maintenance effort due to duplication of already present information. I would like to take this opportunity to point out that admin boundaries and coastline are conceptually and geographically distinct, and should almost never coincide. Admin boundaries are typically at the low-water mark, and sometimes miles off shore, whereas the coastline is defined as the high-water line. While I am aware of this, it is not something that is actually reflected in OSM (at least in my area) and is not something I believe we can realistically distinguish (it may be different where high and low tide are significantly different, but if they are very close, as is the case in the mediterranean, it is hard to map). I would not want to request to be able to distinguish high and low water in order to be able to map administrative boundaries (although if you do use different geometry, it is of course fine). Cheers Martin
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