Towards a unified visual database access
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
Visual map algebra: a direct-manipulation user interface for GIS
Proceedings of the third IFIP WG2.6 working conference on Visual database systems 3 (VDB-3)
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)
Spatial SQL: A Query and Presentation Language
IEEE Transactions on Knowledge and Data Engineering
Query-by-example: a data base language
IBM Systems Journal
A Data-Flow Approach to Visual Querying in Large Spatial Databases
VISUAL '02 Proceedings of the 5th International Conference on Recent Advances in Visual Information Systems
A pictorial human computer interaction to query geographical data
PCI'05 Proceedings of the 10th Panhellenic conference on Advances in Informatics
GeoPQL: a geographical pictorial query language that resolves ambiguities in query interpretation
Journal on Data Semantics III
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In this paper, we present a visual language dedicated to spatial data called Lvis. This language has been defined as an extension of the Cigales visual language based on the Query-By-Example principle. The language is based on predefined icons modelling spatial objects and operators that are used to build a visual query. The visual query is then translated into the host language of Geographic Information Systems (GIS). A major problem of such a language is that visual queries are generally ambiguous because of multiple interpretation of the visual representation. We first present a brief state of the art of languages dedicated to GIS and then formally define our visual language. The global architecture of the system is described. We then focus on visual ambiguities and propose a model of detection and resolution of these ambiguities.