[Tagging] geology taggin?

[Morten Kjeldgaard]

On 13/11/2010, at 12.40, Ulf Lamping wrote:

> How is landcover orthogonal to landuse / natural?

Because you can imagine a landcover area overlapping -- or being a  
part of -- a landuse area. For example, landuse=nature_reserve might  
include landcover=heath, landcover=trees, landcover=lava_field. And  
these may also include areas outside of the nature reserve and be part  
of an adjacent landuse=farmyard.

OSM tags were not delivered to us on stone tablets. They are  
constantly evolving because new and surprising uses and ways of doing  
things emerge. Yes, we can use "surface=*" for everything, roads,  
buildings, forests, lakes, banks, restaurants, and so on, and that  
perhaps makes sense if you think of the map as a photoshop document  
where each pixel only has one colour. But those of us concerned future  
development of the database, wish for a more expressive and rich set  
of tagging options, enabling us to describe more complex circumstances  
of the world.

-- Morten