Information Systems of the Public Sector as a data source for micro-analysis in urban environment: Information systems of both central and local governments represent important data sources for micro- analysis enabling to monitor and model spatio-temporal situation and utilize them in new applications. They provide possibilities how to identify trends, better understand and explain processes running in a given territory, trigger early warnings and launch well-targeted measures which can help to i.e. eliminate societal threats. Real-time links to selected sources enable to develop new applications especially for the mobile platform providing highly updated and accurate services i.e. for transport optimisation. The exploitation of public sector information systems faces many issues including legislative and ethical requirements, data harmonisation, and consistency improvements. The paper identifies main plus and contras, opportunities, and describes selected examples of application especially in urban environment.