A method of analyzing location data of mobile communication devices. The method comprises determining a dwell time of each of a plurality of mobile communication devices in location clusters associated with each device by an application that executes on a computer, determining a centroid of the location clusters by the application, for each of the plurality of mobile communication devices, determining by the application centroids of the location clusters associated with the mobile communication device that are located within a predefined geometry, analyzing by the application the dwell times of mobile communication devices in the predefined geometry based on the determination of centroids that are located within the predefined geometry, and building a building traffic flow survey by the application based on the analysis of dwell times of mobile communication devices in the predefined geometry.