GISQL: a query language interpreter for geographical information systems
Proceedings of the third IFIP WG2.6 working conference on Visual database systems 3 (VDB-3)
Maintaining knowledge about temporal intervals
Communications of the ACM
Information systems for urban planning
Information systems for urban planning
On 3D Topological Relationships
DEXA '00 Proceedings of the 11th International Workshop on Database and Expert Systems Applications
VISCO: Bringing Visual Spatial Querying to Reality
VL '98 Proceedings of the IEEE Symposium on Visual Languages
Phenomena: a visual query language for continuous fields
GIS '03 Proceedings of the 11th ACM international symposium on Advances in geographic information systems
Dealing with geographic continuous fields: the way to a visual GIS environment
Proceedings of the working conference on Advanced visual interfaces
A usability-driven approach to the development of a 3D web-GIS environment
Journal of Visual Languages and Computing
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The aim of our research is to provide GIS users with a visual environment where they can formulate spatial queries which implicitly capture the double nature of geographical data. In particular, in this paper we propose an extension to the MGISQL visual environment, where users may pose 3D queries about those phenomena where the third dimension is a relevant feature for data retrieving. The interaction between users and the visual environment is performed by manipulating 3D geometaphors. The underlying algebra for spatial operators is enriched accordingly. Visual queries are composed in a 3D environment, called the Sensitive Cube, characterized by the 3D geometaphors, visualized as 'floating objects'. A prototype of the 3D MGISQL visual environment has been realized, which allows users to query an archaeological--geographical database, whose experimental data refer to a site located around the city of Salerno.