@InProceedings{CāmaraFreiCord:1994:ToAlGe,
               author = "C{\^a}mara, Gilberto and Freitas, Ubirajara Moura de and 
                         Cordeiro, Jo{\~a}o Pedro Cerveira",
          affiliation = "{Divis{\~a}o de Processamento de Imagens (DPI) do Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Divis{\~a}o de 
                         Processamento de Imagens (DPI) do Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Divis{\~a}o de Processamento de Imagens 
                         (DPI) do Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Towards an algebra of geographical fields",
            booktitle = "Anais...",
                 year = "1994",
               editor = "Freitas, Carla dal Sasso and Geus, Klaus de and Scheer, 
                         S{\'e}rgio",
                pages = "205--212",
         organization = "Simp{\'o}sio Brasileiro de Computa{\c{c}}{\~a}o Gr{\'a}fica e 
                         Processamento de Imagens, 7. (SIBGRAPI)",
            publisher = "Sociedade Brasileira de Computa{\c{c}}{\~a}o",
              address = "Porto Alegre",
             keywords = "Geographical information systems, spatial data bases, spatial data 
                         manipulation language.",
             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.",
  conference-location = "Curitiba, PR, Brazil",
      conference-year = "9-11 Nov. 1994",
                 isbn = "978-85-7669-272-0",
             language = "en",
                  ibi = "8JMKD3MGPBW34M/3DEAF2P",
                  url = "http://urlib.net/ibi/8JMKD3MGPBW34M/3DEAF2P",
           targetfile = "27 Towards an algebra of geographical fields.pdf",
                 type = "Linguagens e Visualiza{\c{c}}{\~a}o",
               volume = "1",
        urlaccessdate = "2024, Apr. 26"
}