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		<holdercode>{isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}</holdercode>
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		<secondarykey>INPE-8011-PRE/2831</secondarykey>
		<label>8940</label>
		<citationkey>CâmaraFreiCasa:1995:FiObAl</citationkey>
		<title>Fields and objetcts algebra for GIS operations</title>
		<year>1995</year>
		<secondarydate>20010104</secondarydate>
		<secondarytype>PRE CN</secondarytype>
		<numberoffiles>1</numberoffiles>
		<size>161 KiB</size>
		<author>Câmara, Gilberto,</author>
		<author>Freitas, Ubirajara Moura de,</author>
		<author>Casanova, M. A.,</author>
		<group>DPI-INPE-MCT-BR</group>
		<group>DPI-INPE-MCT-BR</group>
		<conferencename>Simpósio Brasileiro de Geoprocessamento, 3.</conferencename>
		<conferencelocation>Sao Paulo, BR</conferencelocation>
		<date>12-14 jul. 1995</date>
		<pages>407-423</pages>
		<booktitle>Anais</booktitle>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
		<keywords>GEOPROCESSAMENTO, álgebra, Sistemas de Informação Geográfica (sig), linguagem (computador), legal, spring, Sistema de Processamento de Imagens Georreferenciadas (SPRING), languagem programminggeographical informatiom systems.</keywords>
		<abstract>Este trabalho discute o problema da definição formal das operações em Sistemas de informação geográfica. Os dados geográficos são divididos em duas classes: geo-objetos e geo-campos, o que reflete a natureza dual (discreto-continuo) das representações da realidade geográfica. Estudam-se as operações sobre campos, geo-objetos e as transformações 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: This paper addresses the problem of formal definition of the operations on geographical information systems (GIS). Geographical data is divided in two main classes: geo-objects and geofields, which portray discrete and continuous representations of reality. We study the operations over geo-fields, geo-objects, and the transformations between geo-fields and geo-objects. This analysis has been used as the basis for LEGAL, a general spatial language, which is used in the SPRING GIS, developed by INPE, with support fiom IBM Brasil and EMBRAPA.</abstract>
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		<language>pt</language>
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