It is inter alia disclosed to obtain or generate detection data. The detection data comprises position data that is indicative of a position of a terminal and one or more identifiers respectively related to one or more coverage areas detected by the terminal. A negative hit for at least a region of a coverage area representation associated with a coverage area is detected, if at least all of the following conditions (i)-(iii) hold: (i) a class of the coverage area matches at least one class of one or more coverage areas for which respective identifiers are comprised or at least expected to be comprised in the detection data, (ii) the position of the terminal is within the region, and (iii) the detection data does not comprise an identifier related to the coverage area associated with the coverage area representation. At least information on the detected negative hit is used and/or provided for deciding if the region of the coverage area representation shall remain part of the coverage area representation or shall be removed from the coverage area representation, and/or for deciding whether a frequency of generating detection data shall be increased.