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Approximate spatial reasoning using vague objects Kennedy, Kevin
Abstract
A method is proposed for implementing spatial reasoning and spatial knowledge representation on a computer which utilizes a new concept named vague objects. Vague objects are an approximate representation system both for solid objects and for spatial relationships between two or more solid objects. A vague object is a simplified solid ob ject where sharp surfaces are replaced with smooth transitions from the solid to its sur roundings. A vague object can be compared to a cloud with a smoothly varying density that resembles a real solid object. Vague objects can be used to represent spatial concepts as well. A spatial concept is defined as a relation between objects, either solid or vague. Many spatial concepts can be visualized as vague objects, and for simple spatial reasoning, they can be implemented as such. Spatial reasoning with vague objects can be performed using a spatial logic that re sembles Venn diagrams in three dimensions. Spatial reasoning by means of vague objects can be executed sequentially in chains allowing complex spatial descriptions to be evalu ated in a visually understandable fashion. The reasoning system used is reminiscent of fuzzy logic, except that its domain of operation is in three dimensional space. Vague objects simulate some aspects of human spatial reasoning using methods in tended for implementation on a computer. This human-centred approach makes vague objects useful not only for emulating humans but, more importantly, for interacting with them.
Item Metadata
Title |
Approximate spatial reasoning using vague objects
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1993
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Description |
A method is proposed for implementing spatial reasoning and spatial knowledge
representation on a computer which utilizes a new concept named vague objects. Vague
objects are an approximate representation system both for solid objects and for spatial
relationships between two or more solid objects. A vague object is a simplified solid ob
ject where sharp surfaces are replaced with smooth transitions from the solid to its sur
roundings. A vague object can be compared to a cloud with a smoothly varying density
that resembles a real solid object. Vague objects can be used to represent spatial concepts
as well. A spatial concept is defined as a relation between objects, either solid or vague.
Many spatial concepts can be visualized as vague objects, and for simple spatial reasoning,
they can be implemented as such.
Spatial reasoning with vague objects can be performed using a spatial logic that re
sembles Venn diagrams in three dimensions. Spatial reasoning by means of vague objects
can be executed sequentially in chains allowing complex spatial descriptions to be evalu
ated in a visually understandable fashion. The reasoning system used is reminiscent of
fuzzy logic, except that its domain of operation is in three dimensional space.
Vague objects simulate some aspects of human spatial reasoning using methods in
tended for implementation on a computer. This human-centred approach makes vague
objects useful not only for emulating humans but, more importantly, for interacting with
them.
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Extent |
2414354 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-24
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065078
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.