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A spatiotemporal database is a database that manages both space and time information. Common examples include: * Tracking of moving objects, which typically can occupy only a single position at a given time. * A database of wireless communication networks, which may exist only for a short timespan within a geographic region. * An index of species in a given geographic region, where over time additional species may be introduced or existing species migrate or die out. * Historical tracking of plate tectonic activity. At first glance, spatiotemporal databases are an extension of spatial databases. A spatiotemporal database embodies spatial, temporal, and spatiotemporal database concepts, and captures spatial and temporal aspects of data and deals with * geometry changing over time〔(Data Models and Query Languages of Spatio-Temporal Information )〕 and/or * location of objects moving over invariant geometry (known variously as ''moving objects databases'' or real-time locating systems) However, although there exist numerous relational databases with spatial extensions, the spatiotemporal databases are not based on the relational model for practical reasons, chiefly among them that the data is multi-dimensional and capturing complex structures and behaviours. As of 2008, there are no RDBMS products with spatiotemporal extensions. There are some products such as the open-source TerraLib which use a middleware approach storing their data in a relational database. Unlike in the pure spatial domain, there are however no official or ''de facto'' standards for spatio-temporal data models and their querying. In general, the theory of this area is also less well-developed. Another approach is the constraint database system such as MLPQ (Management of Linear Programming Queries).〔http://www.cse.unl.edu/~revesz/MLPQ/mlpq.htm〕 ==Organizations== *http://vldb.org (Very Large Databases) *http://www.dexa.org (Database and Expert Systems Applications) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spatiotemporal database」の詳細全文を読む スポンサード リンク
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