Manipulations of Graphs with a Visual Query Language: Application to a Geographical Information System
نویسندگان
چکیده
Operators for geographical databases can be classified into two categories: thematic-oriented operators and network-oriented operators. Thematic-oriented operators are based on geometric representations (e.g., intersection, inclusion, adjacency). Network-oriented operators are based on graph manipulations whatever the geometric representation is (e.g., a transitive closure of a graph). In this paper we present network manipulations with a visual query language for a geographical database. A query is defined with a visual expression defined with a Query-By-Example approach. The user draws a graphic representing the properties results have to verify. Keyword: Visual query language, Graph manipulations, Geographical Information System
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