3456 search results - page 38 / 692 » Semantics in Spatial Databases |
SIGMOD
1999
ACM
14 years 8 days 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...
ER
2004
Springer
14 years 1 months ago
2004
Springer
This paper uses a knowledge-based approach to querying heterogeneous spatial databases based on an ontology and conceptual and attribute similarities. The ontology, which may be in...
SIGMOD
1998
ACM
14 years 6 days ago
1998
ACM
Two new spatial join operations, distance join and distance semijoin, are introduced where the join output is ordered by the distance betweenthe spatialattribute values ofthe join...
MTA
2000
13 years 7 months ago
2000
Object-level image retrieval is an active area of research. Given an image, a human observerdoesnot see randomdots of colors. Rather,he she observesfamiliarobjectsin the image. The...
SSD
2009
Springer
14 years 2 months ago
2009
Springer
Outsourcing data to third party data providers is becoming a common practice for data owners to avoid the cost of managing and maintaining databases. Meanwhile, due to the populari...