Volume 11, Number 3, November 2019 Join SIGSPATIAL NOW Foreword i-iii Message from the EditorAndreas Züfle  1-2 Section 1: The 4th ACM SIGSPATIAL Student Research Competition (SRC) Grand Finalists Flash: Scalable Spatial Probabilistic Graphical ModelingIbrahim Sabek 3-6 Discovering Human Activity Community in a CityTianyuan Huang 7-8 Section 2: Workshop Reports The 1st ACM SIGSPATIAL International […]