article i nfo Detailed knowledge regarding the whereabouts of people and theirsocial activities inurbanareas with high spa- tial and temporal resolution is still widely unexplored. Thus, the spatiotemporal analysis of Location Based Social Networks (LBSN)has greatpotential regardingthe ability to sensespatial processes and to gain knowledge about urban dynamics, especially with respect to collective human mobility behavior. The objective of this paper is to explore the semantic association between georeferenced tweets and their respective spatiotemporal where- abouts. We apply a semantic topic model classification and spatial autocorrelation analysis to detect tweets indi- cating specific human social activities. We correlated observed tweet patterns with official census data for the case study of London in order to underline the significance and reliability of Twitter data. Our empirical results of semantic and spatiotemporal clustered tweets show an overall strong positive correlation in comparison with workplace population census data, being a good indicator and representative proxy for analyzing workplace-based activities.
['Enrico Steiger', 'Rene Westerholt', 'Bernd Resch', 'Alexander Zipf']
Twitter as an indicator for whereabouts of people? Correlating Twitter with UK census data