Apr 19, 2019, 1:59 AM by graemefi...@gmail.com: > > > On Fri, 19 Apr 2019 at 07:26, Christoph Hormann <> o...@imagico.de > <mailto:o...@imagico.de>> > wrote: > >> On Thursday 18 April 2019, Kevin Kenny wrote: >> > > And how do you verifiably determine if two things are part of the >> > > same physical object? >> >> But as already hinted i am not sure if the Drake Passage is something i >> would consider mappable in OSM based on local knowledge. >> > > But, without wishing to sound facetious, how do we then have coastlines for > Eurasia, Greenland & Antarctica mapped? > > Nobody> has "local knowledge" of the full coastline of any of them, & for > Greenland & Antarctica, what is mapped - the ice cap, which is constantly > moving, or the deep underlying rock? Should we erase them off the map as > they're not "verifiable"? > Coastline can be mapped in fragments and every single part of coastline is locally verifiable. It is not true for objects like oceans, mountain ranges, continents etc. You can go to a beach and check whatever land is on one side and water on other and check shape of a coastline. It is impossible to do it with border between oceans.
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