Journal ArticleDOI
Object-oriented data modelling for spatial databases
Reads0
Chats0
TLDR
The applicability of an object-oriented design methodology to the design of geographical information systems is demonstrated and standard cartographic primitives are represented using IFO, which are used in the modelling of some standard administrative units in the United Kingdom.Abstract:
Data modelling is a critical stage of database design. Recent research has focused upon object-oriented data models, which appear more appropriate for certain applications than either the traditional relational model or the entity-relationship approach. The object-oriented approach has proved to be especially fruitful in application areas, such as the design of geographical information systems which have a richly structured knowledge domain and are associated with multimedia databases. This article discusses the key concepts in object-oriented modelling and demonstrates the applicability of an object-oriented design methodology to the design of geographical information systems. In order to show more clearly how this methodology may be applied, the paper considers the specific object-oriented data model IFO. Standard cartographic primitives are represented using IFO, which are then used in the modelling of some standard administrative units in the United Kingdom. The paper concludes by discussing current r...read more
Citations
More filters
Journal ArticleDOI
Qualitative spatial reasoning: cardinal directions as an example
TL;DR: Addressing a subset of the total problem, namely reasoning with cardinal directions, a completely qualitative method, without recourse to analytical procedures, is introduced and a method for its formal comparison with quantitative formula is defined.
Journal ArticleDOI
Twenty years of progress: GIScience in 2010
TL;DR: It is 20 years since the term "geographic information science" was suggested to encompass the set of fundamental research issues that surround GIS, and several themes are suggested for future research, based both on gaps in what has been accomplished thus far, and on technology trends that will themselves raise research questions.
Journal ArticleDOI
Event‐oriented approaches to geographic phenomena
TL;DR: This paper argues that ‘happenings’ should be upgraded to an equal status with ‘things’ in dynamic geographic representations and suggests ways of doing this, and develops a pure event‐oriented theory of space and time.
Journal ArticleDOI
Literature review of spatio-temporal database models
TL;DR: This paper reviews the different types of spatio-temporal data models that have been proposed in the literature as well as new theories and concepts that have emerged and critically evaluates the various approaches through the use of a case study and the construction of a comparison framework.
Book ChapterDOI
From Objects to Events: GEM, the Geospatial Event Model
TL;DR: The paper shows how such a model extends traditional object-based geospatial models and introduces an extension of UML diagrams to incorporate events and their relationship to each other, and to objects.
References
More filters
Journal ArticleDOI
Extending the database relational model to capture more meaning
TL;DR: In this paper, the relational model is extended to support atomic and molecular semantics, which is a synthesis of many ideas from the published work in semantic modeling plus the introduction of new rules for insertion, update, and deletion.
Journal ArticleDOI
Database abstractions: aggregation and generalization
TL;DR: A triggering mechanism for automatically maintaining these invariants during update operations is proposed, and a simple mapping of aggregation/generalization hierarchies onto owner-coupled set structures is given.
Journal ArticleDOI
Semantic data models
Joan Peckham,Fred J. Maryanski +1 more
TL;DR: The generic properties of semantic data models are described and a representative selection of models that have been proposed since the mid-1970s are presented.
Book
Object-Oriented Concepts, Databases, and Applications
Won Kim,Frederick H. Lochovsky +1 more
TL;DR: A growing interest in the object-oriented programming paradigm prompted the editors to compile a wide-ranging introduction to the subject, beginning with basic concepts and then covering a variety of applications in databases and other areas.
Journal ArticleDOI
IFO: a formal semantic database model
Serge Abiteboul,Richard Hull +1 more
TL;DR: A new, formally defined database model is introduced that combines fundamental principles of “semantic” database modeling in a coherent fashion using a graph-based formalism and a number of fundamental results concerning semantic data modeling are obtained.