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I haven’t looked into it to compare, but the nature of OSM means that most likely either:
- someone local(ish) who is very dedicated to mapping it out has done so
- an imported state level dataset provided a high level of map coverage
It’s the former, but he is not even a local guy, he is just interested, Ottwiz, aka Attila Kun:
https://www.openstreetmap.org/user/ottwiz/diary/406073
His 2 presentations on the topic are linked in a comment:
More info about him on his wiki page: https://wiki.openstreetmap.org/wiki/User:Ottwiz
Because people cared to map it!
Land use is undermapped and underrated but for anyone that hikes, hunts, camps or does search and rescue it can be a literal life saver