ACM SIGMOD Record
A High Level Visual Language for Spatial Data Management
VISUAL '99 Proceedings of the Third International Conference on Visual Information and Information Systems
Qualitative and Topological Relationships in Spatial Databases
SSD '93 Proceedings of the Third International Symposium on Advances in Spatial Databases
SVIQUEL: A Spatial Visual Query and Exploration Language
DEXA '98 Proceedings of the 9th International Conference on Database and Expert Systems Applications
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This paper proposes an extension of the Pictorial Geographical Query Language GeoPQL, that allows the user to express queries pictorially. Topological and metrics operators are already presented in a previous work. This extension refers to queries in which the user uses concepts that the system implicitly interprets and transforms. In particular, the paper adds the oriented polyline to the classic three objects (point, polyline, and polygon) and defines a set of cardinal and positional operators. In order to maintain non-ambiguity in the query’s visual representation, GeoPQL uses three different working spaces, the first for topological and metrics operators, the second for cardinal operators, and the third for positional operators.