An act reserved for land surveyors and carried out on behalf of a property owner. The purpose of the cadastral operation is mainly to amend the cadastral plan of one or more lots. It strikes and replaces the existing numbering of a lot in order to establish a new one. This is a preliminary step to the publication of a declaration of co-ownership, in order to divide the immovable into several lots, so as is can be subject to divided co-ownership.