Volume 12, Number 1, March 2020 Join SIGSPATIAL NOW Foreword i-iii Introduction to this Special Issue: Modeling and Understanding the Spread of COVID-19(Part I)Andreas Züfle  1-2 Section 1: Event Reports The 27th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems(ACM SIGSPATIAL 2019)Chicago, Illinois, USA, November 5-8, 2019Ralf Hartmut Güting, Lars Kulik, Shawn Newsam, […]