I recently discovered the landuse=grass tag (osm.wiki/Proposed_features/Misc._urban_open_space) and I have started applying it to local areas around me, based on local knowledge.

I'm in two minds about this tag though. I think we should map these little grassy areas in these urban areas. I think anything landuse=grass means that people can walk over it, but their shoes might get a big muddy. In otherwords it's a step below highway=track. In fact most of the landuse=grass areas I've been mapping have had a highway=track way going through them. A area tagged with landuse=grass could be used for routing. It also makes the map look nicer and more accurate.

My only complaint is with the name. I don't like it. Should we tag the whole serengetti with landuse=grass? I don't like bringing in localized terms for things (eg landuse=village_green). I think tags should be understandable to what's on the ground ("Oh this bit of ground is used as a grassy area"). This makes mapping easier, since you don't have to have the Map Features page open.