A method and computer processing apparatus for generating data relating to a vertical structure of a built environment and detecting a floor change

A method of generating data relating to a vertical structure of a built environment comprising a plurality of floors, the method comprising:

• receiving altitude change data representing changes in altitude within the built environment of a plurality of mobile devices or from which changes in altitude within the built environment of a plurality of mobile devices can be determined;
• determining a parameter relating to an estimated storey height of the built environment from received said altitude change data;
• and processing received said altitude change data and the said determined parameter relating to the estimated storey height to thereby generate data relating to the vertical structure of the built environment.

Computer processing apparatus including a computer processor, the computer processing apparatus being configured to perform the steps of a method comprising:

• receiving altitude change data representing changes in altitude within a built environment comprising a plurality of floors of a plurality of mobile devices 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 built environment from received said altitude change data;
• and processing received said altitude change data and the said determined parameter relating to the estimated storey height to thereby generate data relating to the vertical structure of the built environment.