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In spatio-temporal applications, moving objects detect their locations via location-aware devices and update their locations continuously to the server. With the ubiquity and massive numbers of moving objects, many spatio-temporal access methods are developed to process user queries efficiently. Spatiotemporal access methods are classified into four categories: (1) Indexing the past data, (2) Indexing the current data, (3) Indexing the future data, and ( 4 ) Indexing data at all points of time.dblp:journals/debu/Nguyen-DinhAM10 fatcat:5w3kzmpd3vfmhfzr534mo2bfi4