hotosm/presets — pull request #18 by skorasaurus (2013-08-21 12:36:58+00:00)
Title: remove surface=undefined ; not a valuable tag

Making this pull request on behalf of @AndrewBuck who was having problems with git....

surface=undefined is pretty superfluous tag and I'd agree.
http://taginfo.openstreetmap.org/tags/surface=undefined
If the surface is not known, why would you need to include the tag at all.

@AndrewBuck could explain more if he'd like.