Land owner doesn't own the air. They can post it but it has no bearing unless you're standing on their land.
I shot some footage around a newly constructed stadium here recently. It was done but four days from opening, it was at dusk, I parked on a public street and up I flew. Got the video I wanted at the Golden hour. JUST wrapping up when I see a guy walking gown the street literally whispering into his cuffed hand. I put my stuff away and closed the back of my suv. He quickly rushed around so that he could see my plate. I asked him, can I help you. He just backed away.
Got in car, started to drive away early guys came off the sidewalk to block my driving away and a car turned sideways at the street corner ahead. All plainclothes average looking dudes.
Of course I stop, made a “little adjustment to my position” in my seat then out window down a bit and asked, what’s up?
Guy flashes some kinda of badge from around his neck says he is stadium security, asks, was that my drone I was flying?
Yup
You aren’t allowed to fly that here, can guy step out.
Nope.
What you hiding?
Nothing, are any of you police?
What does that matter.
Are any of you police? Am I being detained.
Yes.
(Surprised) I am?! By whom.
Just talk to us.
Ok, that’s my drone, what did I do wrong?
You flew over our private construction site where we store our tools and supplies, you cannot do that. We want to see your drone and memory card.
No, not gonna happen. I’ll show you my FAA drone registration (sounds impressive to the uninformed) but I’m not talking chances?
He asks why?
I don’t know you guys.
Then he says, ready for this? I swear this is true: “Homeland security spotted you on camera and sent us, we can go and get them if you’d like. We are checking to make sure you do not have any incendiary devices you could drop by drone.”
Homeland security?
Yes, they have an office next to ours inside the stadium (I later found that this was true).
Finally i thought, let’s change the tone/direction. So, I put my gun back in it’s holster and I stepped out.
Opened the back and pulled the drone so they could see it. I told them I didn’t take any Photos or video, just flew around. We talked a bit more and then someone talked to them on radio and they suddenly just said, ok, you can go.
That’s the kinda crap that happens around here
(Excuse typos, didn’t proofread)