Abstract
Direction-based spatial relationships are critical in many domains, including geographic information systems (GIS) and image interpretation. They are also frequently used as selection conditions in spatial queries. In this paper, we explore the processing of object-based direction queries and propose a new open shape-based strategy (OSS). OSS models the direction region as an open shape and converts the processing of the direction predicates into the processing of topological operations between open shapes and closed geometry objects. The proposed strategy OSS makes it unnecessary to know the boundary of the embedding world and also eliminates the computation related to the world boundary. OSS reduces both I/O and CPU costs by greatly improving the filtering effectiveness. Our experimental evaluation shows that OSS consistently outperforms classical range query strategies (RQS) while the degree of performance improvement varies by several parameters. Experimental results also demonstrate that OSS is more scalable than RQS for large data sets.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 295-304 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Knowledge and Data Engineering |
| Volume | 15 |
| Issue number | 2 |
| DOIs | |
| State | Published - Mar 2003 |
Bibliographical note
Funding Information:This work is sponsored in part by the Army High Performance Computing Research Center under the auspices of the US Department of the Army, Army Research Laboratory cooperative agreement number DAAH04-95-2-003/contract number DAAH04-95-C-0008, the content of which does not necessarily reflect the position or the policy of the government and no official edorsement should be inferred.
Keywords
- Object-based direction query
- Open shape
- Range query
- Spatial query processing