Method and system for monitoring height change in material pile operation process

The invention relates to a height change monitoring method and system in a material pile operation process. The method comprises steps of collecting a reference plane image of a material field for accommodating a material pile from the vertical right above of the material pile, and determining the distance proportional relation between the pixel distance of the reference plane image and the pre-measured shape data of the material field; measuring an emission angle between a to-be-emitted laser beam and the vertical direction; emitting a laser beam to irradiate the surface of the material pilein the initial operation state, collecting a first plane image corresponding to the initial state of the material field, and recording a first pixel position where a laser point in the first plane image is located; emitting a laser beam to irradiate the surface of the material pile after operation, collecting a second plane image corresponding to the material field at the moment, and recording a second pixel position wher