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39
T.: Spatio-Temporal Databases: Contentions, Components and Consolidation
- In: Proc. DEXA 2000 (ASDM 2000), IEEE Press
, 2000
"... Spatio-temporal databases have been the focus of considerable research activity over a significant period. However, there are as of yet very few prototypes of complete systems, far less products that provide effective support for applications tracking changes to spatial and aspatial data over time. ..."
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Spatio-temporal databases have been the focus of considerable research activity over a significant period. However, there are as of yet very few prototypes of complete systems, far less products that provide effective support for applications tracking changes to spatial and aspatial data over time. We contend that this is because much of the activity in spatio-temporal databases has focused on specific parts of the problem, at the expense of a more holistic view of database systems design and development. It is probably also the case that the database research community has been inclined to undervalue integration or consolidation activities. This paper outlines some contentions relating to spatio-temporal databases, with a view to pruning the space of possible paths that consolidation activities might follow.
Tutorial ”spatial data types: Conceptual foundation for the design and implementation of spatial database systems and gis
- In The 6th International Symposium on Advances in Spatial Databases
, 1999
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A Spatiotemporal Database for Ozone in the Conterminous U.S.
"... This paper considers a set of ozone data in the conterminous U.S., which records the ozone concentration levels at a set of monitoring sites during 1994 and 1999. Existing GIS techniques are insufficient in handling such kind of spatiotemporal data in terms of data interpolation, visualization, repr ..."
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This paper considers a set of ozone data in the conterminous U.S., which records the ozone concentration levels at a set of monitoring sites during 1994 and 1999. Existing GIS techniques are insufficient in handling such kind of spatiotemporal data in terms of data interpolation, visualization, representation and querying. We adopt 3-D shape functions from finite element methods for the spatiotemporal interpolation of the ozone dataset and analyze interpolation errors. The 3-D shape function based method estimates ozone concentration levels with less than 10 percent Mean Absolute Percentage Error. We give two approaches for visualizing the data: (i) combining the ArcGIS visualization tool with shape function interpolation results to visualize the ozone data for each year from 1994 and 1999, (ii) using Matlab to visualize the interpolated ozone data in a 3-D vertical profile display. For the spatiotemporal data representation, we use the constraint data model, because it can give an efficient and accurate representation of interpolation results. Finally, we give some practical query examples. 1.
Efficient querying and animation of periodic spatio-temporal databases
- ANN. MATH. ARTIF. INTELL
, 2002
"... We propose a representation of spatio-temporal objects with continuous and cyclic or acyclic periodic movements. We also describe an extended relational alg-bra query language for databases with such objects. We show that the new spatio-temporal databases are closed under the extended relational alg ..."
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We propose a representation of spatio-temporal objects with continuous and cyclic or acyclic periodic movements. We also describe an extended relational alg-bra query language for databases with such objects. We show that the new spatio-temporal databases are closed under the extended relational algebra queries, and each fixed relational algebra query can be evaluated in PTIME in the size of the input database.
Journal of Visual Languages
, 2003
"... www.elsevier.com/locate/jvlc Gene expression data clustering and visualization based on a binary hierarchical clustering framework ..."
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www.elsevier.com/locate/jvlc Gene expression data clustering and visualization based on a binary hierarchical clustering framework
Indexing Moving Points (Extended Abstract)
- 19TH ACM SYMPOSIUM ON PRINCIPLES OF DATABASE SYSTEMS
, 1999
"... We propose three indexing schemes for storing a set S of N points in the plane, each moving along a linear trajectory, so that a query of the following form can be answered quickly: Given a rectangle R and a real value t q , report all K points of S that lie inside R at time t q . We first presen ..."
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We propose three indexing schemes for storing a set S of N points in the plane, each moving along a linear trajectory, so that a query of the following form can be answered quickly: Given a rectangle R and a real value t q , report all K points of S that lie inside R at time t q . We first present a data structure that, for any given constant " ? 0, uses O(N=B) disk blocks, where B is the block size, and answers a query in O((N=B) 1=2+" + K=B) I/Os. It can also report all the points of S that lie inside R for a given time interval [t 1 #t 2 ]. A point can be inserted or deleted, or the trajectory of a point can be changed, in O(log 2 B N) I/Os. Next, we present a general approach that improves the query time if the queries arrive in chronological order, by allowing the data structure to evolve over time. We obtain a tradeoff betwe...
TIMECENTER Participants
, 1999
"... All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately. ..."
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All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
Developments in Spatio-Temporal Query Languages
"... Integrating spatio-temporal data as abstract data types into already existing data models is a promising approach to creating spatio-temporal query languages. In this context, an important new class of queries can be identified which is concerned with developments of spatial objects over time, that ..."
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Integrating spatio-temporal data as abstract data types into already existing data models is a promising approach to creating spatio-temporal query languages. In this context, an important new class of queries can be identified which is concerned with developments of spatial objects over time, that is, queries ask especially for changes in spatial relationships. Based on a definition of the notion of spatio-temporal predicate we provide a framework which allows to build more and more complex predicates starting with a small set of elementary ones. These predicates can be well used to characterize developments. We show how these concepts can be realized within the relational data model. In particular, we demonstrate how SQL can be extended to enable the querying of developments. 1
Language Bindings for Spatio-Temporal Database Programming in Tripod
, 2004
"... While there are many proposals for spatio-temporal data models and query languages, there is a lack of research into application development using spatio-temporal database systems. This paper seeks to redress the balance by exploring how to support database programming for spatio-temporal object ..."
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While there are many proposals for spatio-temporal data models and query languages, there is a lack of research into application development using spatio-temporal database systems. This paper seeks to redress the balance by exploring how to support database programming for spatio-temporal object databases, with specific reference to the Tripod spatio-temporal OODBMS.