This book constitutes the thoroughly refereed proceedings of the 4th International Conference on Geographical Information
Systems Theory, Applications and Management, GISTAM 2018, held in Funchal, Madeira, Portugal, in March 2018.The 7 revised
full papers presented were carefully reviewed and selected from 58 submissions. The papers are centered on urban and regional
planning; water information systems; geospatial information and technologies; spatio-temporal database management; decision
support systems; energy information systems; GPS and location detection.