There's another part to landing protection which is meant to use the downward vision system to 'scan' the landing zone under the aircraft to see if it's safe to land.
I don't know what criteria it works to, but I do know from earlier in the year when I was trying to work out some issues with landing once the battery was around critical level, landing protection gets in the way badly.
I had a few scenarios where the
I2 hit critical power exactly as i was about to land. When Landing protection was enabled, the
I2 would flag up a warning message and ask if you wanted to land... it was way to easy to accidentally clear/negate the warning and cancel the auto landing that the
I2 was trying to initiate by pressing c1/c2 which would dismiss the message and cancel the landing leaving the
I2 in the air... if you then tried to land manually (which you'd just been doing anyway!), it would refuse to land as it seemed to have started the landing protection scanning over again, if you then moved the sticks to try and waggle the aircraft in to doing what you wanted, it confused it even more as the landing area changed ... and it had to redo the scan again... all of which was happening as everything is beeping at you and you're getting stressed and beginning to panic because the darned thing won't do what you tell it and land.... you end up toggling the gear up/down, moving the
I2 around trying to get it to land... the first few times it happened, I didn't even see the warnings on screen, I only found them in the logs afterwards when trying to analyse what had happened.
After testing various bits, I figured life was a whole lot less stress if auto gear, ground proximity and landing protection where disabled. Since turning them off, I've never had the
I2 baulk at landing again. Quite the opposite - I've had it plonk itself down on the landing pad a couple of times because I was being to gentle/slow for it

, but that's all.
(And before anyone has a go at me for flying to the critical extremes... it was done deliberately to train my responses to the
I2, test the aircraft behaviour, and to find out how it handled and what could go wrong... I don't normally fly to 10% or lower

)