Mir Poludnya = Avatar

Story: The World of Noon by Arkady & Boris Strugatsky (published 1958-1988)
Story: Avatar by James Cameron (script created 1995-2009)

WoN: Planet named Pandora, covered with jungles
Avatar: Planet named Pandora, covered with jungles

WoN: Populated by sentient dog-like humanoids
Avatar: Populated by sentient cat-like humanoids

WoN: Specific flora & fauna, connected by common conscience
Avatar: Specific flora & fauna, connected by common conscience

WoN: Popular tourism destination, plagued by incursions by the natives
Avatar: Important resource destination, plagued by incursions by the natives

WoN: Humans send biologist Mikhail Sidorov to live with the natives
Avatar: Humans send marine Jake Sully to live with the natives


Yeah...


Also, see
10 Blue Characters That Are More Interesting Than the Aliens in 'Avatar'