This book constitutes the refereed post-proceedings of the 9th International Conference on Geographical Information Systems Theory, Applications and Management, GISTAM 2023, held in Prague, Czech Republic during April 25–27, 2023. The 6 full papers included in this book were carefully reviewed and selected from  37 submissions. They focus on challenges in geo-spatial data sensing, observation, representation, processing, visualization, sharing and managing, in all aspects concerning both information communication and technologies (ICT) as well as management information systems and knowledge-based systems.