What does earth dragon mean in geomantic omen?

In geomantic omen, the terrain is judged according to the direction of mountains and rivers. Good terrain is generally described as Long Mai. It is to say that the good terrain is Jackie Chan, that is, the earth dragon. When building a cemetery, the position on the Long Mai is the best position, and the direction of the tomb is consistent with the body direction of the earth dragon. Generally speaking, the compass is used to measure the best direction. The direction of the tomb is the most critical, and the direction is not good. Even if the mausoleum is located on the Long Mai, it will directly affect the inheritance and promotion of future generations. Note that the compass must not touch the ground when measuring.