Richard Mann wrote:

> The surface key is unusable for practical rendering - it's too detailed.

The surface page on the wiki has been hijacked by the usual  
wiki-gardening suspects. Tagwatch, as ever, is a much better guide:  
http://tagwatch.stoecker.eu/Europe/En/tags.html

It suggests that paved, unpaved, gravel, cobblestone, ground and grass  
are the most common values (those with over 10k uses). I'm not  
entirely sure about "ground" (surface=air, anyone?) but the rest sound  
good to me.

Remember that clients don't have to render/route everything distinctly  
- indeed, renderers generally _shouldn't_ if they care about good  
cartography. It'd be quite sensible for a map to do something like

    if    surface==paved                then # colour 1
    elsif surface=~/gravel|cobblestone/ then # colour 2
    else                                     # colour 3

cheers
Richard


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