Earth the biography - TV reports it at 480p?

[sjbluray]

Yes, I am sure the disc is blu-ray, it says blu on the disc and it don't matter now anyway because its WAY too late to return the disc to amazon. I got around to watching the first disc and on a whim I hit up amazon and seen some one say the blu was 480p even though the case says 1080i and it sure the heck don't look as good as a 1080p disc... it almost looks like an upconverted dvd

Well sure enough I brought up the info for my TV, a 47" LG lc47df and the tv reported the disc as 480p

So no I am wondering why. Even standard TV is reported as 480p? Is this just a TV issue that dont do interlaced frames and draws the whole picture at once?

Any ideas?