Abstract: Hosting indices of different customers on searchers provided by one or more distributed storage systems can be implemented as computer-readable methods, media and systems. Statistical data for a set of indices is obtained, where each index is to be hosted on a searcher of a plurality of searchers. Scores for each index are calculated for a first searcher, where each index is associated with a respective customer of a set of customers, and the calculating is based on evaluating data for targeted average distributions of indices of each customer at the first searcher. A subset of indices are identified to be hosted at the first searcher based on evaluating the calculated scores. A request to secure an index from the identified subset of indices for hosting the index on the first searcher is initiated, and the index is hosted on the first searcher.

Abstract: The invention provides a method of generating data relating to a vertical structure (20) of a built environment comprising a plurality of floors (24, 26, 28), the method comprising: receiving altitude change data representing changes in altitude within the built environment of a plurality of mobile devices (1a, 1b, 1c, 1d) or from which changes in altitude of a plurality of mobile devices within a built environment comprising a plurality of floors can be determined; determining a parameter relating to an estimated storey height of the building from received said altitude change data; and processing received said altitude change data and the said parameter relating to the estimated storey height to thereby generate data relating to the vertical structure of the multi-storey building.

Abstract: The invention provides a method of generating data relating to a vertical structure (20) of a built environment comprising a plurality of floors (24, 26, 28), the method comprising: receiving altitude change data representing changes in altitude within the built environment of a plurality of mobile devices (1a, 1b, 1c, 1d) or from which changes in altitude of a plurality of mobile devices within a built environment comprising a plurality of floors can be determined; determining a parameter relating to an estimated storey height of the building from received said altitude change data; and processing received said altitude change data and the said parameter relating to the estimated storey height to thereby generate data relating to the vertical structure of the multi-storey building.