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		<isbn>978-85-7669-272-0</isbn>
		<citationkey>CâmaraFreiCord:1994:ToAlGe</citationkey>
		<title>Towards an algebra of geographical fields</title>
		<format>Impresso, On-line.</format>
		<year>1994</year>
		<numberoffiles>1</numberoffiles>
		<size>5505 KiB</size>
		<author>Câmara, Gilberto,</author>
		<author>Freitas, Ubirajara Moura de,</author>
		<author>Cordeiro, João Pedro Cerveira,</author>
		<group>DPI-INPE-MCT-BR</group>
		<affiliation>Divisão de Processamento de Imagens (DPI) do Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Divisão de Processamento de Imagens (DPI) do Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Divisão de Processamento de Imagens (DPI) do Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<editor>Freitas, Carla dal Sasso,</editor>
		<editor>Geus, Klaus de,</editor>
		<editor>Scheer, Sérgio,</editor>
		<e-mailaddress>cintiagraziele.silva@gmail.com</e-mailaddress>
		<conferencename>Simpósio Brasileiro de Computação Gráfica e Processamento de Imagens, 7 (SIBGRAPI)</conferencename>
		<conferencelocation>Curitiba</conferencelocation>
		<date>9 - 11 nov. 1994</date>
		<volume>1</volume>
		<pages>205-212</pages>
		<booktitle>Anais</booktitle>
		<publisher>Sociedade Brasileira de Computação</publisher>
		<publisheraddress>Porto Alegre</publisheraddress>
		<tertiarytype>Artigo</tertiarytype>
		<keywords>Geographical information systems, spatial data bases, spatial data manipulation language.</keywords>
		<abstract>This work presents a proposal for an algebra of geographical fields. Geographical fields are the mathematical expression of continuously-varying spatial data, such as thematic maps, digital terrain models and satellite imagery. The paper outlines an initial proposal for an algebra of geographical fields that enables the definition of operations based on the properties of geographical data, independent of their graphical representation. This proposal is being used as a data manipulation language in SPRING, a geographical information system developed by INPE.</abstract>
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		<language>en</language>
		<targetfile>27 Towards an algebra of geographical fields.pdf</targetfile>
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