tailieunhanh - Event-oriented approaches to geographic phenomena

Special events often bring attention and significant economic benefits and opportunities to local communities. These could include an influx of revenue into the local community, such as the hotel and restaurant industry. Local event planners must not sacrifice public safety for the sake of economic benefit. Certain businesses in a community may be adversely affected by certain requirements of the special event, such as closing streets in a commercial area or increased traffic in residential areas. Additional staffing may be required to ensure that service calls by local emergency services agencies are not hampered | Event-oriented approaches to geographic phenomena Michael Worboys National Center for Geographic Information and Analysis University of Maine Orono ME 04469 USA worboys@ Abstract This paper is about the information-theoretic foundations upon which useful explanatory and predictive models of dynamic geographic phenomena can be based. It traces the development over the last decade or so of these foundations from sequences of temporal snapshots through ob ject life histories to event chronicles. A crucial ontological distinction is drawn between things and happenings that is between continuant and occurrent entities. Most of the work up to now has focused on representing the evolution through time of geographic things whether objects or fields. This paper argues that happenings should be upgraded to an equal status with things in dynamic geographic representations and suggests ways of doing this. The main research focus of the paper is the application of an algebraic approach previously developed mainly in the context of computational processes to real-world happenings. It develops a pure process theory of space and time and demonstrates its applicability by providing an example of the representation of motion of a vehicle through a region. The paper concludes by noting some of the requirements for scaling this approach to real-world dynamic scenarios such as might be found for example in the automation of coordination of disaster relief. Keywords spatiotemporal event process algebra logic 1 Mike Worboys Draft under review 2 1 Introduction The title of this paper makes reference to two previous papers of the author and colleagues. In 36 the object-oriented approach was introduced and applied to spatial data modeling. It has since turned out that seeing the world as a collection of classified objects with properties relationships to each other and definable behavior is an extremely useful approach to modeling. The theme was continued in 34 where .