[Tagging] surface earth vs ground vs dirt

[Jean-Marc Liotier]

On 04/12/2016 08:29 PM, Martin Koppenhoefer wrote:
> ground is a synonym for [..] without man made coating

As I tag heavily with surface=ground, this is indeed my definition. I 
use that when I tag from orbital imagery, when I'm certain that there is 
no man-made coating but I can't distinguish whether the surface is sand 
or raw dirt... My on-the-ground (pun intended) experience of the areas 
where I use this tag (mostly Senegal) tells me that it is usually either 
or a mix of the two that varies along the way. When I have visual 
evidence that the highway is at least packed dirt, then I use 'unpaved'.