Abstract
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 spatial and non-spatial constraints. Basic filters are designed to represent the various types of queries in such systems. Icons for different types of spatial relations arc used to denote the filters. Different granularities of the relations are presented in a hierarchical fashion when selecting the spatial constraints. The language constructs are presented and examples are used to demonstrate the expressiveness of the approach in representing different kinds of queries, including spatial joins and composite spatial queries. The implementation prototype of the language is also described and its features evaluated against a general purpose GIS package.
| Original language | English |
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| Title of host publication | SIXTH INTERNATIONAL CONFERENCE ON INFORMATION VISUALISATION, PROCEEDINGS |
| Editors | AD Williams |
| Publisher | IEEE Computer Society |
| Pages | 226-233 |
| Number of pages | 8 |
| ISBN (Print) | 0-7695-1656-4 |
| Publication status | Published - 2002 |
| Event | 6th International Conference on Information Visualisation - LONDON Duration: 10 Jul 2002 → 12 Jul 2002 |
Conference
| Conference | 6th International Conference on Information Visualisation |
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| City | LONDON |
| Period | 10/07/02 → 12/07/02 |
Keywords
- SQL