Enable birds-eye view for player in T3D

I need to develop a game in which during the game player can fly above the game world through having access to bird-eye view. For example, similar to something like Google Earth, the player can fly above the game environment and see rivers, rocks, forests, etc included in the game. Could someone please guide me or introduce me some materials to figure out how can I enable such a capability in my developing game? Since I am new to T3D I will be grateful if you could provide me with simpler solutions. Thank you in advance.