Does anyone know if this is based on the Book of the same title by Jeff Long?

Rating: 10/10 (3 August 2006)

Does anyone know if this is based on the Book of the same title by Jeff Long? Long? The premise sounds pretty much the same, and the book itself is outstanding. Having only seen the previews my friends and I are still unsure if it is the same material. I don't want to give any spoilers to the book or the movie, but it anyone would happen to know IF they are the one and the same please comment back to the site.
Anyone trekking into the bowels of the earth can still take the original idea from Edgar Rice Burroughs who first wrote about the Center of the Earth with his world Pellucidar. Man I hope I spelled thatv right. Of course we need to give a nod to HG Wells for his Journey to the Center of the Earth book, but the Burroughs saga went of as series both being written some 100 years ago as well.
Long's book written in the past ten years is very contemporary as is the movie. Any insider input as to crediting this to his book would be appreciated.