FIELDS AND OBJECTS ALGEBRAS FOR GIS OPERATIONS1

Gilberto Câmara · Ubirajara Moura De Freitas · Marco A. Casanova

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Geographic Information Systems Studies 3D Modeling in Geospatial Applications Data Management and Algorithms

Abstract

Este trabalho discute o problema da definicao formal das operacoes em sistemas de informacao geografica. Os dados geograficos sao divididos em duas classes: geo-objetos e geo-campos, o que reflete a natureza dual (discreto-continuo)das representacoes da realidade geografica. Estudam-se as operacoes sobre campos, geo-ojetos e as transformacoes entre geo-campos e geo-objetos. A analise deste trabalho serve de base para LEGAL, uma linguagem espacial utilizada no sistema SPRING, desenvolvido pelo INPE com apoio da IBM Brasil e da EMBRAPA.

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1990Geographic information systems and cartographic modeling

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1996Spring: Integrating remote sensing and gis by object-oriented data modelling

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