Spatio-Temporal Object Modeling

Spatio-Temporal Object Modeling

Bo Huang (Chinese University of Hong Kong, China) and Magesh Chandramouli (Purdue University, USA)
Copyright: © 2009 |Pages: 7
DOI: 10.4018/978-1-59140-995-3.ch018
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Abstract

Integrating spatial and temporal dimensions is a fundamental yet challenging issue in modeling geospatial data. This article presents the design of a generic model within the object-oriented paradigm to represent spatially-varying, temporally-varying, and spatio-temporally-varying information using a mechanism, called parametric polymorphism. This mechanism allows a conventional data type (e.g., string and integer) to be enhanced into a spatial, temporal, and/or spatiotemporal collection type, and so an ordinary attribute can be extended with spatial and/or temporal dimensions flexibly. An associated object query language has also been provided to support the manipulation of spatio-temporal information. The design of the model as well as the query language has given rise to a uniform representation of spatial and temporal dimensions, thereby offering a new option for the development of a spatio-temporal GIS to facilitate urban/environmental change tracking and analysis.
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Overview

Spatio-temporal databases are a subject of increasing interest and the research community is dedicating considerable effort in this direction. Natural as well as man-made entities can be referenced with respect to both space and time. The integration of the spatial and temporal components to create a seamless spatio-temporal data model is a key issue that can improve spatio-temporal data management and analysis immensely (Langran, 1992).

Numerous spatio-temporal models have been developed. Notable among these are the snapshot model (time-stamping layers, Armstrong 1988), the space-time composite (time-stamping attributes, Langran and Chrisman 1988), the spatio-temporal object model (ST-objects, Worboys 1994), the event-based spatio-temporal data model (ESTDM, Peuquet and Duan 1995) and the three-domain model (Yuan 1999). The snapshot model incorporates temporal information with spatial data by timestamping layers that are considered as tables or relations. The space-time composite incorporates temporal information by timestamping attributes, and usually only one aspatial attribute is chosen in this process. In contrast to the snapshot and the space-time composite models, Worboys’s (1994)spatio-temporal object model includes persistent object identifiers by stacking changed spatiotemporal objects on top of existing ones. Yuan (1999) argues that temporal Geographic Information Systems (GIS) lack a means to handle spatio-temporal identity through semantic links between spatial and temporal information. Consequently, three views of the spatio-temporal information, namely spatial, temporal, and semantic, are provided and linked to each other. Peuquet and Duan’s ESTDM (1995) employs the event as the basic notion of change in raster geometric maps. Changes are recorded using an event list in the form of sets of changed raster grid cells. In fact, event-oriented perspectives that capture the dynamic aspects of spatial domains are shown to be as relevant for data modeling as object-oriented perspectives (Worboys and Hornsby 2004; Worboys, 2005).

Despite these significant efforts in spatio-temporal data modeling, challenges still exist:

  • a.

    Object attributes (e.g., lane closure on a road) can change spatially, temporally, or both spatially and temporally, and so facilities should be provided to model all of these cases, i.e., spatial changes, temporal changes, and spatio-temporal changes;

  • b.

    Object attributes may change asynchronously at the same, or different, locations.

As an additional modeling challenge, object attributes can be of different types (e.g., speed limit is of the integer type and pavement material is of the string type). To overcome these challenges, a spatio-temporal object model that exploits a special mechanism, parametric polymorphism, seems to provide an ideal solution (Huang, 2003).

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Parametric Polymorphism For Spatio-Temporal Extensions

Parametric polymorphism has been extensively studied in programming languages (PL), especially in functional PLs (e.g. Metalanguage, ML). In general, using parametric polymorphism, it is possible to create classes that operate on data without having to specify the data’s type. In other words, a generic type can be formulated by lifting any existing type. A simple parametric class (type) can be expressed as follows:class CP<parameter>{parameter a;…};where parameter is a type variable. The type variable can be of any built-in type, which may be used in the CP-declaration..

Key Terms in this Chapter

Spatial Change: The value of an attribute of certain type (e.g., integer or string) changes at different locations

History: A list of value-time pairs representing the temporal change.

Spatio-Temporal Change: The value of an attribute of certain type (e.g., double or string) changes at different locations and/or different times.

Temporal Change: The value of an attribute of certain type (e.g. integer or string) changes at different times

Polymorphism: The ability to take several forms. In object-oriented programming, it refers to the ability of an entity to refer at run-time to instances of various classes; the ability to call a variety of functions using exactly the same interface

Parametric Polymorphism: The ability of writing classes that operate on data without specifying the data’s type

Distribution: A list of value-location pairs representing the spatial change.

Parametric Type: The type that has type parameters

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Table of Contents
Chapter 1
Jose E. Córcoles, Pascual González
An interesting feature of GML is to consider it as a database, but only in the strictest sense of the term. That is, as a collection of data. As a... Sample PDF
GML as Database: Present and Future
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Chapter 2
Jose E. Córcoles, Pascual González
As a database format, XML (GML by extension) can be queried. In order to do this, we need a query language (of general use) to retrieve information... Sample PDF
Querying GML: A Pressing Need
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Chapter 3
Michael Vassilakopoulos, Antonio Corral, Boris Rachev, Irena Valova, Mariana Stoeva
Image Databases (IDBs) are a kind of Spatial Databases where a large number of images are stored and queried. In this chapter, techniques for... Sample PDF
Image Database Indexing Techniques
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Chapter 4
Patrik Skogster
Geographic information is created by manipulating geographic (or spatial) data (generally known by the abbreviation geodata) in a computerized... Sample PDF
Different Roles and Definitions of Spatial Data Fusion
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Chapter 5
Carlos Granell, Michael Gould, Miguel Ángel Manso, Miguel Ángel Bernabé
Geographic Information Systems (GIS) are data-centric applications that rely on the input and constant maintenance of large quantities of basic and... Sample PDF
Spatial Data Infrastructures
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Chapter 6
Trias Aditya, Menno-Jan Kraak
The vision of “created once, used many times” has been spread out across the globe through the development of geospatial data infrastructure (GDI)... Sample PDF
Geoportals and the GDI Accessibility
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Chapter 7
Hervé Gontran
The development of road database requires the management of continuously growing road databases. Mobile mapping systems can acquire this... Sample PDF
Real-Time Extraction of the Road Geometry
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Chapter 8
Cognitive Maps  (pages 58-64)
Stephen Hirtle
Cognitive maps are the representations that individuals use to understand, process, and navigate environments. The term cognitive map should not be... Sample PDF
Cognitive Maps
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Chapter 9
Map Overlay Problem  (pages 65-72)
Maikel Garma de la Osa, Yissell Arias Sánchez
Maps usually contain data from different sources (e.g., population, natural resources, cities, roads, infant mortality rate, etc.) When all the... Sample PDF
Map Overlay Problem
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Chapter 10
Mahbubur R. Meenar, John A. Sorrentino
Three-dimensional surface modeling has become an important element in the processing and visualization of geographic information. Models are created... Sample PDF
Dealing with 3D Surface Models: Raster and TIN
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Chapter 11
Yurai Núñez-Rodríguez
Web map services, such as Google Maps and MapQuest, are among the most popular sites on the Internet. One can easily access these services through a... Sample PDF
Web Map Servers Data Formats
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Chapter 12
Eric Delmelle, Raymond Dezzani
There has been a dramatic increase in the handling of geospatial information, and also in the production of maps. However, because the Earth is... Sample PDF
Overview, Classification and Selection of Map Projections for Geospatial Applications
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Chapter 13
José Poveda, Michael Gould
In this chapter we present some well-known algorithms for the solution of the point location problem and for the more particular problem of... Sample PDF
About the Point Location Problem
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Chapter 14
Alina Lazar, Bradley A. Shellito
Support Vector Machines (SVM) are powerful tools for classification of data. This article describes the functionality of SVM including their design... Sample PDF
Classification in GIS Using Support Vector Machines
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Chapter 15
Network Modeling  (pages 113-121)
Kevin M. Curtin
Network models are some of the earliest and most consistently important data models in GISystems. Network modeling has a strong theoretical basis in... Sample PDF
Network Modeling
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Chapter 16
Xiaojun Yang
Artificial neural networks are increasingly being used to model complex, nonlinear phenomena. The purpose of this chapter is to review the... Sample PDF
Artificial Neural Networks
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Chapter 17
Spatial Interpolation  (pages 129-136)
Xiaojun Yang
Spatial interpolation is a core component of data processing and analysis in geoinformatics. The purpose of this chapter is to discuss the concept... Sample PDF
Spatial Interpolation
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Chapter 18
Bo Huang, Magesh Chandramouli
Integrating spatial and temporal dimensions is a fundamental yet challenging issue in modeling geospatial data. This article presents the design of... Sample PDF
Spatio-Temporal Object Modeling
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Chapter 19
May Yuan
Temporal Geographic Information Systems (GIS) technology has been a top research subject since late the 1980s. Langran’s Time in Geographic... Sample PDF
Challenges and Critical Issues for Temporal GIS Research and Technologies
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Chapter 20
Iftikhar U. Sikder
The representation of geographic entities is characterized by inherent granularity due to scale and resolution specific observations. This article... Sample PDF
Rough Sets and Granular Computing in Geospatial Information
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Chapter 21
Matthew Perry, Amit Sheth, Ismailcem Budak Arpinar, Farshad Hakimpour
The amount of digital data available to researchers and knowledge workers has grown tremendously in recent years. This is especially true in the... Sample PDF
Geospatial and Temporal Semantic Analytics
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Chapter 22
Yuqi Bai, Liping Di, Aijun Chen, Yang Liu, Yaxing Wei
Three public geospatial image catalog services, FGDC Clearinghouse, NASA ECHO and GMU CSISS CSW, were reviewed, considering the following aspects... Sample PDF
Geospatial Image Metadata Catalog Services
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Chapter 23
Peisheng Zhao, Liping Di, Wenli Yang, Genong Yu, Peng Yue
The Semantic Web technology provides a common interoperable framework in which information is given a well-defined meaning such that data and... Sample PDF
Geospatial Semantic Web: Critical Issues
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Chapter 24
Carlos Granell, Michael Gould, Miguel Ángel Esbrí
In the context of Geographic Information System’s evolution from monolithic systems to personal desktop GIS and then to collections of remote... Sample PDF
Geospatial Web Service Chaining
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Chapter 25
Genong Yu, Liping Di, Wenli Yang, Peisheng Zhao, Peng Yue
Multi-agent system is specialized in studying the collective effects of multiple intelligent agents. An intelligent agent is a computer system with... Sample PDF
Multi-Agent Systems for Distributed Geospatial Modeling, Simulation and Computing
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Chapter 26
Peng Yue, Liping Di, Wenli Yang, Genong Yu, Peisheng Zhao
In a service-oriented environment, an individual geospatial Web service is not sufficient to solve a complex real-world geospatial problem. Service... Sample PDF
Towards Automatic Composition of Geospatial Web Services
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Chapter 27
Aijun Chen, Liping Di, Yuqi Bai, Yaxing Wei
The definition of the Grid computing and its application to geoinformatics are introduced. Not only the comparison of power Grid and computing Grid... Sample PDF
Grid Computing and its Application to Geoinformatics
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Chapter 28
Yaxing Wei, Liping Di, Guangxuan Liao, Baohua Zhao, Aijun Chen, Yuqi Bai
With the rapid accumulation of geospatial data and the advancement of geoscience, there is a critical requirement for an infrastructure that can... Sample PDF
Sharing of Distributed Geospatial Data through Grid Technology
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Chapter 29
Alexander Klippel, Kai-Florian Richter, Stefan Hansen
This contribution provides an overview of elements of cognitively ergonomic route directions. Cognitive ergonomics, in general, seeks to identify... Sample PDF
Cognitively Ergonomic Route Directions
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Chapter 30
Péter Hegedüs, Mihály Orosz, Gábor Hosszú, Ferenc Kovács
This chapter details the potential found in combining to different technologies. The two basically different technologies, LBSs in mobile... Sample PDF
Multicast Over Location-Based Services
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Chapter 31
Routing  (pages 246-253)
Kevin M. Curtin
Routing is the act of selecting a course of travel. Routing problems are one of the most prominent and persistent problems in geoinformatics. This... Sample PDF
Routing
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Chapter 32
Location Privacy  (pages 254-259)
Matt Duckham
In this chapter, the author raises a number of issues surrounding the ever-growing capabilities of geoinformatics. Location privacy can be defined... Sample PDF
Location Privacy
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Chapter 33
Vladimir I. Zadorozhny
The author of this chapter considers the location-based approach for performance tuning that significantly facilitates the challenge of utilizing... Sample PDF
Location-Based Performance Tuning in Mobile Sensor Networks
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Chapter 34
Henrik Hanke, Alf Neumann
The provisioning of Location-Based Services (LBS) follows the chain of determination of a position, mapping this information onto a natural... Sample PDF
Location-Based Services: A Taxonomy on Theory and Practice
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Chapter 35
Coupling GPS and GIS  (pages 277-284)
Mahbubur R. Meenar, John A. Sorrentino, Sharmin Yesmin
Since the 1990s, the integration of GPS and GIS has become more and more popular and an industry standard in the GIS community worldwide. The... Sample PDF
Coupling GPS and GIS
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Chapter 36
Wei-Shinn Ku, Haojun Wang, Roger Zimmermann
With the availability and accuracy of satellite-based positioning systems and the growing computational power of mobile devices, recent research and... Sample PDF
Modern Navigation Systems and Related Spatial Query
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Chapter 37
Muhammad Usman Iqbal, Samsung Lim
Over the past few decades, the technologies of mobile communication, positioning, and computing have gradually converged. The automobile has been a... Sample PDF
Location Privacy in Automotive Telematics
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Chapter 38
Mohammed A. Quddus
Map matching algorithms integrate positioning data with spatial road network data to support the navigation modules of intelligent transport systems... Sample PDF
Map Matching Algorithms for Intelligent Transport Systems
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Chapter 39
Andrés Pazos, José Poveda, Michael Gould
In this chapter we present a package-based component architecture for the specific deployment and maintenance of public sector applications... Sample PDF
A Package-Based Architecture for Customized GIS
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Chapter 40
Magesh Chandramouli, Bo Huang
This article explores the application of virtual environments to 3D geospatial visualization and exploration. VR worlds provide powerful... Sample PDF
Virtual Environments for Geospatial Applications
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Chapter 41
Iftikhar U. Sikder
Geospatial predictive models often require mapping of predefined concepts or categories with various conditioning factors in a given space. This... Sample PDF
Managing Uncertainty in Geospatial Predictive Models
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Chapter 42
Arianna D’Ulizia, Fernando Ferri, Patrizia Grifoni
The main issues of spatial databases and Geographic Information System (GIS), concern the representation, the management and the manipulation of a... Sample PDF
Geographic Visual Query Languages and Ambiguities Treatment
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Chapter 43
Lionel Savary, Georges Gardarin, Karine Zeitouni
GML is a promising model for integrating geodata within data warehouses. The resulting databases are generally large and require spatial operators... Sample PDF
GeoCache: A Cache for GML Geographical Data
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Chapter 44
Lyn Kathlene
This chapter describes and analyzes the effectiveness of two methodological techniques, cognitive mapping and geographical information systems... Sample PDF
Cognitive Mapping and GIS for Community-Based Resource Identification
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Chapter 45
Edward Mac Gillavry
The collection and dissemination of geographic information has long been the prerogative of national mapping agencies. Nowadays, location-aware... Sample PDF
Collaborative Mapping and GIS: An Alternative Geographic Information Framework
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Chapter 46
Iftikhar U. Sikder, Santosh K. Misra
This article proposes a multi-agent based framework that allows multiple data sources and models to be semantically integrated for spatial modeling... Sample PDF
Semantic Interoperability of Geospatial Services
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Chapter 47
George Kakaletris, Dimitris Varoutas, Dimitris Katsianis, Thomas Sphicopoulos
Broadband communication networks have begun to spread rapidly over fixed networks, with wireless networks following at close distance. The excess... Sample PDF
Biometric Authentication in Broadband Networks for Location-Based Services
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Chapter 48
Stelios C.A. Thomopoulos, Nikolaos Argyreas
The globally observed recession of mobile services market has pushed mobile network operators into looking for opportunities to provide value added... Sample PDF
Design and Implementation Approaches for Location-Based, Tourism-Related Services
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