The invention concerns a method for representing a volume of earth using a modelling environment comprising an application, said environment being implemented in one or a plurality of programmed computers. The module is constructed as a three-dimensional hollow body, comprising at least one sheet material made of thin-walled flexurally elastic material, which is placed under bending stress by at least one additional sheet material so as to form a cavity, in such a manner that said thin-walled flexurally elastic material assumes a curved shape. Ion implantation is performed for the second evaluation substrate by using an ion beam parallel to the direction defined by the first indices. Each segment is prioritized based on its characteristics.