1) No idea... probably location-specific too. 2) I ask the owner first (perhaps they even want to send me the data directly). If they don't respond, I go ahead

1) No idea... probably location-specific too. 2) I ask the owner first (perhaps they even want to send me the data directly). If they don't respond, I go ahead and scrape, spreading the requests over a long time so as not hit their website too hard.