Abstract: Apparatus is configured to scan for radio signals transmitted by at least first and second transmitting devices; for each radio signal identified in the scan, receive an identifier relating to the originating transmitting device from the radiosignal; use the identifier and/or parameters of a radio signal received from the first transmitting device and the identifier and/or parameters of a radio signal received from the second transmitting device to detect whether the first and second transmitting devices are co-located; and in response to detecting that the first and second transmitting devices are co-located: create a group for the transmitting devices that are identified as being co-located; create wireless fingerprint data for the group as a whole and refrain from creating wireless fingerprint data for every transmitting device of the group; and cause transmission of the wireless fingerprint data to a remote server.

Abstract: It is disclosed to obtain physical layout data of radiomap based on a plurality of location information representatives, each of the location information representatives being associated with a radiomeasurement.

Abstract: It is disclosed to obtain an observation data set comprising respective identification information of one or more observed radio nodes of an environment and respective radio measurements values determined with respect to the one or more observed radio nodes; to determine respective association measures for the observation data set with respect to respective radiomap data sets of two or more levels of the environment, wherein the radiomap data sets respectively comprise respective identification information of one or more radio nodes of the environment observable at the level of the respective radiomap data set and respective radio measurement value information for these one or more observable radio nodes; and to determine an estimate of a level associated with the observation data set based at least on the association measures.