Results 11 to 20 of about 2,551,481 (193)
Query inseparability by games [PDF]
, 2014 We investigate conjunctive query inseparability of description logic knowledge bases (KBs) with respect to a given signature, a fundamental problem for KB versioning, module extraction, forgetting and knowledge exchange.
Ryzhikov, Vladislav +4 more
core +7 more sources
Spatial cohesion queries [PDF]
Proceedings of the 23rd SIGSPATIAL International Conference on Advances in Geographic Information Systems, 2015 Given a set of attractors and repellers, the cohesion query returns the point in database that is as close to the attractors and as far from the repellers as possible. Cohesion queries find applications in various settings, such as facility location problems, location-based services.
Dimitris Sacharidis +1 more
openaire +1 more source
Complex Spatial Query Processing [PDF]
GeoInformatica, 2004 The user of a Geographical Information System is not limited to conventional spatial selections and joins, but may also pose more complicated and descriptive queries. In this paper, we focus on the efficient processing and optimization of complex spatial queries that involve combinations of spatial selections and joins. Our contribution is manifold; we
Mamoulis, N, Papadias, D, Arkoumanis, D
openaire +3 more sources
Multi-Step Processing of Spatial Joins [PDF]
, 1994 Spatial joins are one of the most important operations for combining spatial objects of several relations. In this paper, spatial join processing is studied in detail for extended spatial objects in twodimensional data space.
Kriegel, Hans-Peter +7 more
core +2 more sources
Query processing of spatial objects: Complexity versus Redundancy [PDF]
, 1993 The management of complex spatial objects in applications, such as geography and cartography, imposes stringent new requirements on spatial database systems, in particular on efficient query processing. As shown before, the performance of spatial query
Kriegel, Hans-Peter +3 more
core +1 more source
Query processing of geometric objects with free form boundarie sin spatial databases [PDF]
, 1993 The increasing demand for the use of database systems as an integrating factor in CAD/CAM applications has necessitated the development of database systems with appropriate modelling and retrieval capabilities.
Kriegel, Hans-Peter +3 more
core +1 more source
Topological queries in spatial databases
Proceedings of the fifteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems, 1996 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Christos H. Papadimitriou +2 more
openaire +5 more sources
A storage and access architecture for efficient query processing in spatial database systems [PDF]
, 1993 Due to the high complexity of objects and queries and also due to extremely large data volumes, geographic database systems impose stringent requirements on their storage and access architecture with respect to efficient query processing.
Kriegel, Hans-Peter +8 more
core +1 more source
A NOVEL APPROACH OF INDEXING AND RETRIEVING SPATIAL POLYGONS FOR EFFICIENT SPATIAL REGION QUERIES [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017 Spatial region queries are more and more widely used in web-based applications. Mechanisms to provide efficient query processing over geospatial data are essential. However, due to the massive geospatial data volume, heavy geometric computation, and high
J. H. Zhao +7 more
doaj +1 more source
GeoSpark SQL: An Effective Framework Enabling Spatial Queries on Spark
ISPRS International Journal of Geo-Information, 2017 In the era of big data, Internet-based geospatial information services such as various LBS apps are deployed everywhere, followed by an increasing number of queries against the massive spatial data.
Zhou Huang +3 more
doaj +1 more source