This isn't like on the PC where you can perfectly see threw everything to see ores this will probably be mainly used for finding caves and dungeons since that is what only appears. So basically this is a Cave Finder glitch. This can aid with the 'When Pigs Fly' Achievement.

1.) Go dig a 2x1x20 tunnel. 2 Height 1 Width 20 Length
2.) Go into 3rd person so your can see the front of your Minecraft avatar.
3.) Move the camera up so it is touching the ceiling of your tunnel.
4.) Start either moving forward or backwards either way is fine.

Enjoy!