Geo-SAL: A query language for spatial data analysis. Conventional query languages focus on the retrieval and modification of data from a database to a user or a host program. Queries are usually expected to be relatively uncomplicated, leaving deeper processing functions to specialized host programs. In contrast with this view, the language SAL [Arnb80] was designed with the goal of being able to support stepwise, in-depth analysis of data, stored and managed as relations in a specially designed statistical database system, Cantor [Kara86]. This paper surveys the design objectives, operators and grammatical structures of Geo-SAL, a successor of SAL being developed for spatial data analysis purposes. In addition to facilities needed for representation and retrieval of spatial data, Geo-SAL includes primitives and structures which permit the solution of complex, multi-step spatial analysis problems within a coherent, declarative language.

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  1. Viqueira, Jose R. Rios; Lorentzos, Nikos A.: SQL extension for spatio-temporal data (2007) ioport
  2. Cotelo Lema, Jose Antonio; G├╝ting, Ralf Hartmut: Dual grid: A new approach for robust spatial algebra implementation (2002)
  3. Segoufin, Luc; Vianu, Victor: Querying spatial databases via topological invariants (2000)
  4. Papadimitriou, C. H.; Suciu, D.; Vianu, V.: Topological queries in spatial databases (1999)