Fecha de publicación: 22/12/2022 Fuente: WIPO (eseential oils OR extracts) This invention is capable of using relative permittivity to determine the depth at which a buried object is buried.　In this depth estimation device, a migration unit carries out migration while changing a relative permittivity according to a relative permittivity range and determines migration results for each changed relative permittivity. An extremity information extraction unit extracts three-dimensional data for an extreme point. A buried object detection unit uses a detection device that has been trained in advance to detect the coordinates of a buried object. Referring to the coordinates of the extreme point in three-dimensional data for nearby coordinates based on the coordinates of the buried object, a depth estimation unit adopts the relative permittivity corresponding to the extreme point and estimates the depth of the buried object on the basis of the adopted relative permittivity and a reflection time.