On Sat, 8 Feb 2020 09:03:45 -0800 stevea <stevea...@softworkers.com> wrote:
> On Feb 8, 2020, at 2:58 AM, Rory McCann <r...@technomancy.org> wrote: > > On 07.02.20 20:12, stevea wrote: > >> A well-known example is (national, other) boundaries, which > >> frequently do not exist "on the ground," > > National borders don't exist on the ground? huh? Have you ever > > actually _crossed_ an international border? I assure you they exist > > on the ground. From large infrastructure, to changes in the paint > > colour on roads, one can nearly always *see* where a border is. > > I didn't say "always" (I said "frequently," though I was being > parochial / local to me). Between USA and Canada, for thousands (and > thousands) of kilometers, the national border is entirely invisible. > True, in places, it exists in an observable way (some stone markers, > border crossings with paint-on-asphalt, even a fence or wall here or > there), but I'd even say "mostly," the USA-Canada national border > simply "isn't there:" nothing on-the-ground, that is. Have you actually been to the US-Canada border? For thousands and thousands of kilometers, it's really obvious: https://upload.wikimedia.org/wikipedia/commons/a/aa/US-Canada_border_at_Crawford_State_Park_20130629.jpg Even when it's not as obvious as in that photo, there are still frequent boundary cairns. And yes, they're mapped in OSM: https://www.openstreetmap.org/node/1997617997 -- Mark _______________________________________________ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk
