I can't believe my Dad does this for a hobby!...
Spisany wot srbrook dnja 23 November 2011 w rěči English.... was the comment my daughter made after spending a couple of afternoons tracing over aerial imagery in support of her geography coursework. The group had sampled ground cover (grass/heath/wood etc) with GPS locations on a university field trip and were creating KML polygons of land use as a map overlay.
A quick check of the area in OSM showed complete land use coverage for the area - probably added by previous students with OSM knowledge.