Paper Info
Title
An Object Model of Direction and Its Implications
Abstract
Direction is an important spatial concept that is used in many fields such as geographic information systems(GIS) and image interpretation. It is also frequently used as a selection condition in spatial queries. Previous work has modeled direction as a relational predicate between spatial objects. Conversely, in this paper, we model direction as a new kind of spatial object using the concepts of vectors, points and angles. The basic approach is to model direction as a unit vector. This novel view of direction has several obvious advantages: Being modeled as a spatial object, a direction object can have its own attributes and operation set. Secondly, new spatial data types such as oriented spatial objects and open spatial objects can be defined at the abstract object level. Finally, the object view of direction makes direction reasoning easy and also reduces the need for a large number of inference rules. These features are important in spatial query processing and optimization. The applicability of the direction model is demonstrated by geographic query examples.
Year
DOI
Venue
1999
10.1023/A:1009888814892
GeoInformatica
Keywords
Field
DocType
direction,orientation,open object,oriented spatial object
Spatial analysis,Computer vision,Geographic information system,Data mining,Computer science,Object model,Object-based spatial database,Artificial intelligence,Spatial query,Rule of inference,Spatial database,Unit vector
Journal
Volume
Issue
ISSN
3
4
1573-7624
Citations 
PageRank 
References 
10
0.80
16
Authors
3
Name
Order
Citations
PageRank
Shashi Shekhar143521098.43
Xuan Liu224819.36
Sanjay Chawla31372105.09