Extension and Expression of OWL Modeling Primitives Based on Spatio-Temporal Ontology of Ocean Flow Field

2020 ◽  
pp. 321-335
Author(s):  
Min Ji ◽  
Qingsong Shi ◽  
Fengxiang Jin ◽  
Ting Li ◽  
Yong Sun
Keyword(s):  
Flow Field ◽  
Temporal Ontology ◽  
Spatio Temporal

Geographical Process Representation

2014 ◽  
pp. 73-96
Author(s):  
Claudio E. C. Campelo ◽  
Brandon Bennett
Keyword(s):  
Real World ◽  
Reference System ◽  
Future Research ◽  
Temporal Ontology ◽  
Geographic Space ◽  
Process Representation ◽  
Semantic Reference ◽  
Spatio Temporal ◽  
Temporal Granularity ◽  
Open Issues

This chapter discusses the issues and challenges arising when building a general spatio-temporal ontology for representing and reasoning of geographical processes as part of a desired universal semantic reference system of geographic space. It examines the foundations and formalisms upon which the development of such an ontological model of geographical processes can be based. The chapter begins by providing a background of essential concepts related to the representation of geographical processes. Then overviews of several approaches to representing spatio-temporal processes and how to associate them with geographic space are given. Following this, the chapter discusses several open issues on the topic and presents a set of desiderata for representing and reasoning about real-world dynamic geographical phenomena. This discussion covers aspects of space, time, object, event, state, and process as the essential concepts to represent geo-processes. It also covers aspects of spatial-temporal granularity and spatio-temporal aggregation, describing how they relate to geographical processes. Finally, this chapter also explores the phenomenon of vagueness and how it affects the representation and reasoning about geo-processes. The chapter concludes by indicating directions for future research and recapitulating its overall coverage.

The optic flow field: the foundation of vision

1980 ◽  
Vol 290 (1038) ◽  
pp. 169-179 ◽  
Keyword(s):  
Flow Field ◽  
Visual System ◽  
Mathematical Analysis ◽  
Optic Flow ◽  
Starting Point ◽  
Spatio Temporal ◽  
Behavioural Experiments ◽  
Optic Array ◽  
Activity Information

As a basis for understanding the visual system, we need to consider the functions that vision has to perform, which are pre-eminently in the service of activity, and the circumstances in which it normally operates, namely when the head is moving. The fundamental ecological stimulus for vision is not a camera-like time-frozen image but a constantly changing optic array or flow field, the description of which must be in spatio-temporal terms. A mathematical analysis of the optic flow field is presented, revealing the information that it affords for controlling activity - information both about the topography of the environment and about the movement of the organism relative to the environment. Results of human behavioural experiments are also reported. It is suggested that the optic flow field should be the starting point in attempting to discover the physiological workings of the visual system.

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