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		<label>7796</label>
		<citationkey>CâmaraFreiCasa:1995:FiObAl</citationkey>
		<title>Fields and objects algebras for GIS operations</title>
		<year>1995</year>
		<secondarydate>19961215</secondarydate>
		<secondarytype>PRE CN</secondarytype>
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		<author>Câmara, Gilberto,</author>
		<author>Freitas, Ubirajara Moura de,</author>
		<author>Casanova, M. A,</author>
		<group>DPI-INPE-MCT-BR</group>
		<conferencename>Simpósio Brasileiro de Geoprocessamento, 3.</conferencename>
		<conferencelocation>Sao Paulo</conferencelocation>
		<date>jul. 1995</date>
		<pages>407-424</pages>
		<booktitle>Anais</booktitle>
		<transferableflag>1</transferableflag>
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		<keywords>PROCESSAMENTO DIGITAL DE IMAGENS.</keywords>
		<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.</abstract>
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