Abstract: A computer-implemented method for determining the height of a plurality of buildings in a region is described, the method comprising: retrieving a map of building locations in the region; retrieving a plurality of sensor data records from a plurality of mobile network devices, wherein each sensor data record comprises horizontal coordinate data and elevation data; processing the plurality of sensor data records and the map of building locations to generate a map set of building heights.

Abstract: An electrochemical element (1) suitable for use at high (>55° C.) temperatures comprises an electrolyte (4), an anode (3), a cathode (6), and current collectors for the anode and the cathode, wherein the anode (3) comprises as a host material for alkali metal ions a spinel type material which is an alkali metal titanium oxide, preferably in the form of a nano-powder and the current collector of the anode (3) is an aluminium metal based current collector.