Question

What do you mean by , "I took a bird's eye view of the whole place."

Answer 1

the sentence means that you have seen properly the whole place. bird's have a very good eye sight and hence this is said so.

hope it helped ☺

Answer 2

The sentence means that you took a clear view of specific place, observing nook and corner.
here, your eye compared with a bird's eye as it can observe every petty thing in its surrounding