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.

Reconstruction of Piecewise-explicit Surfaces from Three-dimensional Polylines and Heightmap Fragments.- Comparison of Traditional and Constrained Recursive Clustering Approaches for Generating Optimal Census Block Group Clusters.- Emergence of Geovigilantes and Geographic Information Ethics in the Web 2.0 Era.- Indexing Spelling Variants for Accurate Address Search.- Geovisualization Technologies Applied to Statistical Characterization of the Iberian Peninsula Rainfall using the Global Climate Monitor Web Viewer.- What Are You Willing to Sacrifice to Protect Your Privacy when using a Location-based Service?.- Enabling Standard Geospatial Capabilities in Spark for the Efficient Processing of Geospatial Big Data.

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