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)
Information systems for urban planning
Information systems for urban planning
SQL/SDA: A Query Language for Supporting Spatial Data Analysis and Its Web-Based Implementation
IEEE Transactions on Knowledge and Data Engineering
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
Extending the metaphor GIS query language and environment to 3D domains
Proceedings of the Working Conference on Advanced Visual Interfaces
Towards a new visual query language for GIS
DBA'06 Proceedings of the 24th IASTED international conference on Database and applications
Entity-relationship and object-oriented formalisms for modeling spatial environmental data
Environmental Modelling & Software
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Recently, much attention has been devoted to the management of continuous fields, which describe geographic phenomena, such as temperature, electromagnetism and pressure. While objects are distinguished by their dimensions, and can be associated with points, lines, or areas, such phenomena can be measurable at any point of their domain by distinguishing what varies, and how smoothly. Thus, when dealing with continuous fields, a basic requirement is represented by users' capability to capture some features of a scenario, by selecting an area of interest and handling the involved phenomena.The aim of our research is to provide GIS users with a visual environment where they can manage both continuous fields and discrete objects, by posing spatial queries which capture the heterogeneous nature of phenomena. In particular, in this paper we propose a visual query language Phenomena, which provides users with a uniform style of interaction with the world, which is conceptually modeled as a composition of continuous fields and discrete objects. The intuitiveness of the underlying operators as well as of the query formulation process is ensured by the choice of suitable metaphors and by the adoption of the paradigm of direct manipulation.A prototype of a visual environment running Phenomena has been realized, which allows users to query experimental data by following a SQL-like SELECT-FROM-WHERE scheme.