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This paper proposes workload-aware Adaptive OcTree based Trajectory clustering Index (ATTI) aiming at optimizing trajectory storage and index performance. The contributions are three-folds. ... based on GPS update workload; Third, the query workload adaptive mechanism is proposed based on virtual OcTree forest. ... Query Adaptive Virtual Forest Impact of Query Size to Index Workload-aware OcTree can dynamically adjust its structure according to the changing of workload. ...doi:10.1587/transinf.e96.d.643 fatcat:4a6jqwd64beatbvpg4ucpexq7q