Technical Report Details
| Date |
1-7-2003 |
| Number |
DISI-TR-03-09 |
| Title |
ST_ODMG: A Multigranular Spatiotemporal Extension of ODMG Model |
| Authors |
Elena Camossi, Michela Bertolotto, Elisa Bertino, Giovanna Guerrini |
| Bibtex Entry |
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| E-mail |
camossi@disi.unige.it |
| Link |
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| Abstract |
A large percentage of data managed by a variety of application domains has
spatiotemporal characteristics. Unfortunately, traditional geographical
information systems do not allow to easily represent temporal aspects of spatial data.
Moreover, they do not usually support the representation of data at multiple
levels of detail. In this paper we present a multigranular
spatiotemporal data model, that extends the ODMG model with multiple spatial
and temporal granularities. In particular, the model allows for a uniform management of two
kinds of spatiotemporal objects: moving entities (e.g., cars, planes, etc.) and
temporal maps (i.e., maps representing the change over time of a given geographic
area). It also provides a framework for mapping the movement of an entity such as
a car onto an underlying geographic area. The model we propose relies on a
standard definition of temporal granularity. On the other hand, the representation
of spatial entities at multiple granularities is obtained by applying model
oriented map generalization principles. In particular, we consider a set of
generalization operators that guarantee topological consistency and their inverse functions for
performing spatial specialization. |
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