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163
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WWW
2003
ACM
16 years 7 months ago
2003
ACM
Much attention has been accorded to Location-Based Services and location tracking, a necessary component in active, trigger-based LBS applications. Tracking the location of a larg...
160
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PODS
2000
ACM
15 years 10 months ago
2000
ACM
We consider spatial databases in the plane that can be defined by polynomial constraint formulas. Motivated by applications in geographic information systems, we investigate line...
189
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SIGMOD
1999
ACM
15 years 10 months ago
1999
ACM
Selectivity estimation of queries is an important and wellstudied problem in relational database systems. In this paper, we examine selectivity estimation in the context of Geogra...
152
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IV
2003
IEEE
15 years 11 months ago
2003
IEEE
In the paper, we suggest a set of visualization-based exploratory tools to support analysis and comparison of different spatial development scenarios, such as results of simulatio...
155
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HT
1993
ACM
15 years 10 months ago
1993
ACM
Hypertexts may be implicitly structured, based on either node content or context. In this paper, we examine implicit structures that rely on the interpretation of node’s spatial...