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		<citationkey>CamaraNetoMonPaiGomVel:2000:ToUnFr</citationkey>
		<author>Camara Neto, GIlberto,</author>
		<author>Monteiro, Antonio Miguel Vieira,</author>
		<author>Paiva, Joao Argemiro de carvalho,</author>
		<author>Gomes, Jonas,</author>
		<author>Velho, Luiz,</author>
		<group>DPI-INPE-MCT-BR</group>
		<group>DPI-INPE-MCT-BR</group>
		<group>DPI-INPE-MCT-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto de Matemática Pura e Aplicada (IMPA)</affiliation>
		<affiliation>Instituto de Matemática Pura e Aplicada (IMPA)</affiliation>
		<electronicmailaddress>gilberto@dpi.inpe.br</electronicmailaddress>
		<electronicmailaddress>miguel@dpi.inpe.br</electronicmailaddress>
		<title>Towards a unified framework for geographical data models</title>
		<conferencename>Simpósio Brasileiro de GeoInformática, 2 (GEOINFO).</conferencename>
		<year>2000</year>
		<booktitle>Anais</booktitle>
		<date>12-13 2000</date>
		<conferencelocation>Sao Paulo, BR</conferencelocation>
		<keywords>GEOPROCESSAMENTO, Sistemas de Informacao Geografica (sig), interoperabilidade, geografic information systems, GIS, data systems, interoperability, taxonomy.</keywords>
		<abstract>This paper describes a unified framework for the problems of modelling and processing geographical entities. We propose a general definition of geographical objects, and show that the different types of geographical data can be expressed as particular cases of this definition. Furthermore, we present a taxonomy for the various types of GIS operations, defined in terms of the properties of this definition. Our goal is to argue that GIS data types and operations can be defined based on a single formal notion, which encapsulates the GIS concepts of both fields and objects, with important consequences for system and interface design, interoperabilty issues and language proposal.</abstract>
		<language>en</language>
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