Contributo in atti di convegno, 2007, ENG

Spatio-temporal aggregations in trajectory data warehouses

Orlando S.; Orsini R.; Raffaetà A.; Roncato A.; Silvestri C.

CNR-ISTI, Pisa - Dipartimento di Informatica, Università Ca' Foscari Venezia, Venice, Italy; Dipartimento di Informatica, Università Ca' Foscari Venezia, Venice, Italy; Dipartimento di Informatica, Università Ca' Foscari Venezia, Venice, Italy; Dipartimento di Informatica, Università Ca' Foscari Venezia, Venice, Italy; Dipartimento di Informatica e Comunicazione, Università di Milano, Milan, Italy

In this paper we investigate some issues related to the design of a simple Data Warehouse (DW), storing several aggregate measures about trajectories of moving objects. First we discuss the loading phase of our DW which has to deal with overwhelming streams of trajectory observations, possibly produced at different rates, and arriving in an unpredictable and unbounded way. Then, we focus on the measure presence, the most complex measure stored in our DW. Such a measure returns the number of trajectories that lie in a spatial region during a given temporal interval. We devise a novel way to compute an approximate, but very accurate, presence aggregate function, which algebraically combines a bounded amount of measures stored in the base cells of the data cube.

Data Warehousing and Knowledge Discovery . 9th International Conference on Data Warehousing and Knowledge Discovery, DaWaK '07, pp. 66–77, Regensburg, Germany, 3-7 September 2007

Keywords

Data Warehouses, Trajectory Data, Moving Objects

CNR authors

Orlando Salvatore

CNR institutes

ISTI – Istituto di scienza e tecnologie dell'informazione "Alessandro Faedo"

ID: 44017

Year: 2007

Type: Contributo in atti di convegno

Creation: 2009-06-16 00:00:00.000

Last update: 2018-02-05 13:58:17.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:44017