Results 11 - 20 of 80

A Visual Language for the Evolution of Spatial Relationships and its Translation into a Spatio-Temporal Calculus

by Martin Erwig - Journal of Visual Languages and Computing , 2003
"... Queries about objects that change their spatial attributes over time become particularly interesting when they ask for changes in the spatial relationships between different objects. We propose a visual notation that is able to describe scenarios of changing object relationships. The visual language ..."
Abstract - Cited by 7 (1 self) - Add to MetaCart
calculus of spatio-temporal predicates that formally characterizes the evolution of spatial relationships. We also outline a user interface that supports specifications by menus and a drawing editor. The visual notation can be used directly as a visual query interface to spatio-temporal databases

Complex spatio-temporal pattern queries

by Marios Hadjieleftheriou, George Kollios - In VLDB , 2005
"... This paper introduces a novel type of query, what we name Spatio-temporal Pattern Queries (STP). Such a query specifies a spatio-temporal pattern as a sequence of distinct spatial predicates where the predicate temporal ordering (exact or relative) matters. STP queries can use various types of spati ..."
Abstract - Cited by 35 (4 self) - Add to MetaCart
This paper introduces a novel type of query, what we name Spatio-temporal Pattern Queries (STP). Such a query specifies a spatio-temporal pattern as a sequence of distinct spatial predicates where the predicate temporal ordering (exact or relative) matters. STP queries can use various types

unknown title

by unknown authors
"... We introduce a visual language for the specification of tem-porally changing spatial situations. The main idea is to rep-resent spatio-temporal (ST) objects in a two-dimensional way by their trace. The intersections of these traces with other objects are interpreted and translated into sequences of ..."
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of spatial and spatio-temporal predicates, called develop-ments, that can then be used, for example, to query spatio-temporal databases. 1. ST Objects, Predicates, and Developments Spatio-temporal objects like flying airplanes, migrating whales, or spreading fires have the characteristic property

Query-By-Trace: Visual Predicate Specification in Spatio-Temporal Databases

by Martin Erwig, Markus Schneider - ADVANCES IN VISUAL INFORMATION MANAGEMENT – VISUAL DATABASE SYSTEMS , 2000
"... In this paper we propose a visual interface for the specification of predicates to be used in queries on spatio-temporal databases. The approach is based on a visual specification method for temporally changing spatial situations. This extends existing concepts for visual spatial query languages, w ..."
Abstract - Cited by 15 (10 self) - Add to MetaCart
In this paper we propose a visual interface for the specification of predicates to be used in queries on spatio-temporal databases. The approach is based on a visual specification method for temporally changing spatial situations. This extends existing concepts for visual spatial query languages

Mining association rules in spatio-temporal data

by J. Mennis, J. W. Liu - in: Proceedings of the Seventh International Conference on GeoComputation , 2003
"... This research demonstrates the application of association rule mining to spatiotemporal data. Association rule mining seeks to discover associations among transactions encoded in a database. An association rule takes the form A? B where A (the antecedent) and B (the consequent) are sets of predicate ..."
Abstract - Cited by 30 (0 self) - Add to MetaCart
of predicates. A spatiotemporal association rule occurs when there is a spatio-temporal relationship in the antecedent or consequent of the rule. As a case study, association rule mining is used to explore the spatial and temporal relationships among a set of variables that characterize socioeconomic and land

Querying Moving Objects with Uncertainty in Spatio-temporal Databases

by Hechen Liu, Markus Schneider
"... Abstract. Spatio-temporal uncertainty is a special feature of moving objects due to the inability of precisely capturing or predicting their continuously changing locations. Indeterminate locations of moving objects at time instants add uncertainty to their topological relationships. Spatio-temporal ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
Abstract. Spatio-temporal uncertainty is a special feature of moving objects due to the inability of precisely capturing or predicting their continuously changing locations. Indeterminate locations of moving objects at time instants add uncertainty to their topological relationships. Spatio-temporal

Challenges in Spatio-temporal Stream Query Optimization ∗ ABSTRACT

by Hicham G. Elmongui, Mourad Ouzzani, Walid G. Aref
"... Simplified technology and low costs have spurred the use of location-detection devices in moving objects. Usually, these devices will send the moving objects ’ location information to a spatio-temporal data stream management system, which will be then responsible for answering spatio-temporal querie ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
focus on the optimization of multi-predicate spatio-temporal queries on moving objects. We present several major challenges related to the lack of spatio-temporal pipelined operators, and the impact of time, space, and their combination on the query plan optimality under different circumstances of query

A Process-oriented Multi-representation of Gradual Changes

by Yanwu Yang, Christophe Claramunt - Journal of Geographic Information and Decision Analysis , 2003
"... Although GIS has been applied to many application areas, there is still a need for successful integration of the temporal dimension in current spatial data models in order to deal with the complexity of urban and environmental systems. In particular, there are a few spatio-temporal data models ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
in the spatial, temporal and thematic dimensions. Gradual changes are represented at different levels of abstraction while spatio-temporal predicates manipulate the modeling primitives identified. The potential of our modeling approach is illustrated by a case study oriented to the study of "dynamic field

Spatio-temporal filter for structural health monitoring

by Dimitry Gorinevsky, Grant Gordon - American Control Conf , 2006
"... Abstract—This paper considers the use of combined spatial and temporal filtering to improve the quality of a Structural Health Monitoring (SHM) damage estimate. Many SHM systems produce two-dimensional (2-D) array data that contains structure damage estimate, which is distorted by noise from sensor ..."
Abstract - Cited by 3 (3 self) - Add to MetaCart
Abstract—This paper considers the use of combined spatial and temporal filtering to improve the quality of a Structural Health Monitoring (SHM) damage estimate. Many SHM systems produce two-dimensional (2-D) array data that contains structure damage estimate, which is distorted by noise from sensor

Spatial and Spatio-Temporal Data Models and Languages

by Markus Schneider
"... A data model provides a formalism consisting of a notation for describing data of interest and of a set of operations for manipulating these data. It abstracts from reality and provides a generalized view of data representing a specific and bounded scope of the real world. In the context of database ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
or meet, and whether one object is north or southeast of another object. A spatio-temporal data model is a data model representing the temporal evolution of spatial objects over time. These evolutions can be discrete, that is, they happen from time to time (for example, the change of the boundary of a
Results 11 - 20 of 80