[OSM-talk] Ground truth for non-physical objects

Mark Wagner mark+osm at carnildo.com
Tue Dec 18 06:46:35 UTC 2018


On Mon, 17 Dec 2018 14:31:14 +0200
Tomas Straupis <tomasstraupis at gmail.com> wrote:

> 2018-12-17, pr, 11:00 Martin Koppenhoefer rašė:
> > for admin boundaries there will often be at least 2 "true" document
> > sources: one for each party / side. They are also often observable,
> > at least punctually.  
> 
>   I wonder, of those saying that it is a peace of cake to map country
> boundaries by physically observing different things on the ground, how
> many of them have actually practically MAPPED at least a tiny bit of
> country borders (say 50km?). If so, maybe they can come forward and
> tell everybody where exactly and how exactly they did that.

The US-Canada border was already well-mapped by the time I got here,
but somehow, I doubt I'd have any trouble mapping it from aerial
imagery:
https://upload.wikimedia.org/wikipedia/commons/a/aa/US-Canada_border_at_Crawford_State_Park_20130629.jpg

-- 
Mark



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