[ACM Press the 27th ACM SIGSPATIAL International Conference - Chicago, IL, USA (2019.11.05-2019.11.08)] Proceedings of the 27th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems - SIGSPATIAL '19 - Retrieving α-Shapes and Schematic Polygonal Approximations for Sets of Points within Queried Temporal Ranges

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