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| Content Provider | ACM Digital Library |
|---|---|
| Author | Kuijpers, Bart Haesevoets, Sofie Geerts, Floris |
| Copyright Year | 2008 |
| Abstract | We address a fundamental question concerning spatio-temporal database systems: “What are exactly spatio-temporal queries?” We define spatio-temporal queries to be computable mappings that are also $\textit{generic},$ meaning that the result of a query may only depend to a limited extent on the actual internal representation of the spatio-temporal data. Genericity is defined as invariance under groups of geometric transformations that preserve certain characteristics of spatio-temporal data (e.g., collinearity, distance, velocity, acceleration, …). These groups depend on the notions that are relevant in particular spatio-temporal database applications. These transformations also have the distinctive property that they respect the monotone and unidirectional nature of time. We investigate different genericity classes with respect to the constraint database model for spatio-temporal databases and we identify sound and complete languages for the first-order and the computable queries in these genericity classes. We distinguish between genericity determined by time-invariant transformations, genericity notions concerning physical quantities and genericity determined by time-dependent transformations. |
| Starting Page | 1 |
| Ending Page | 51 |
| Page Count | 51 |
| File Format | |
| ISSN | 15293785 |
| e-ISSN | 1557945X |
| DOI | 10.1145/1342991.1342997 |
| Volume Number | 9 |
| Issue Number | 2 |
| Journal | ACM Transactions on Computational Logic (TOCL) |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2008-04-07 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Constraint databases Moving objects Query languages Spatial databases Spatio-temporal databases |
| Content Type | Text |
| Resource Type | Article |
| Subject | Theoretical Computer Science Logic Computational Mathematics Computer Science |
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