550 search results - page 2 / 110 » An Expressive Language for Linear Spatial Database Queries |
IV
2002
IEEE
13 years 11 months ago
2002
IEEE
In this paper a visual approach to querying in large spatial databases is presented. A diagrammatic technique utilising a data flow metaphor is used to express different kinds of...
SDB
1995
13 years 9 months ago
1995
In this paper we discuss two data models for spatial database systems: the linear data model and the topological data model. Both can be used to model a wide range of applications....
CDB
1997
Springer
13 years 10 months ago
1997
Springer
We consider two-dimensional spatial databases defined in terms of polynomial inequalities and investigate the expressibility of the topological connectivity query for these databa...
LCC
1994
13 years 10 months ago
1994
We give an AC0 upper bound on the complexity of rst-oder queries over (in nite) databases de ned by restricted linear constraints. This result enables us to deduce the non-expressi...
JCSS
2000
13 years 6 months ago
2000
The paper investigates the use of topological annotations (called topological invariants) to answer topological queries in spatial databases. The focus is on the translation of to...