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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
23/09/2010 |
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Data da última atualização: |
18/10/2010 |
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Autoria: |
AZEVEDO, L. G.; ZIMBRÃO, G.; SOUZA, J. M. de. |
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Afiliação: |
LEONARDO GUERREIRO AZEVEDO, URFJ; GERALDO ZIMBRÃO, UFRJ; JANO MOREIRA DE SOUZA, UFRJ. |
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Título: |
Approximate query processing in spatial databases using raster signatures. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: DAVID JUNIOR, C. A.; MONTEIRO, A. M. V. (Ed.). Advances in Geoinformatics. Berlin: Springer-Verlag, 2007. |
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Páginas: |
p. 69-86. |
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Idioma: |
Inglês |
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Conteúdo: |
This work is concerned with the use of raster signatures in approximate query processing in spatial databases. We extended the proposals of Azevedo et al. (2004, 2005) of using Four-Color Raster Signature (4CRS) (Zimbrao and Souza, 1998) for fast and approximate processing of queries over polygon datasets. We propose several new algorithms for a set of spatial operations that can be processed approximately using 4CRS. 4CRS stores the main data characteristics in an approximate and compact representation that can be accessed and processed faster than real data. By doing so, the exact geometries of objects are not processed during query execution, which is the most costly step of a spatial operation, since it requires to search and to transfer large objects from disk to main storage (Brinkhoff et al., 1994; Lo and Ravishankar, 1996). Also, the exact processing needs to use CPU-time intensive algorithms to decide whether the objects match the query condition (Brinkhoff et al., 1993). As a result, the approximate query answer is returned in a shorter time than the time to return an exact answer. On the other hand, the answer is estimated and not exact, so a precision measure is also returned as a confidence interval that allows the user to decide if the accuracy of the response is sufficient. In general, this approximate answer is enough for many applications. |
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Palavras-Chave: |
Database management systems; Query processing in spatial databases; Raster signatures. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02005naa a2200193 a 4500
001 1862813
005 2010-10-18
008 2007 bl uuuu u00u1 u #d
100 1 $aAZEVEDO, L. G.
245 $aApproximate query processing in spatial databases using raster signatures.
260 $c2007
300 $ap. 69-86.
520 $aThis work is concerned with the use of raster signatures in approximate query processing in spatial databases. We extended the proposals of Azevedo et al. (2004, 2005) of using Four-Color Raster Signature (4CRS) (Zimbrao and Souza, 1998) for fast and approximate processing of queries over polygon datasets. We propose several new algorithms for a set of spatial operations that can be processed approximately using 4CRS. 4CRS stores the main data characteristics in an approximate and compact representation that can be accessed and processed faster than real data. By doing so, the exact geometries of objects are not processed during query execution, which is the most costly step of a spatial operation, since it requires to search and to transfer large objects from disk to main storage (Brinkhoff et al., 1994; Lo and Ravishankar, 1996). Also, the exact processing needs to use CPU-time intensive algorithms to decide whether the objects match the query condition (Brinkhoff et al., 1993). As a result, the approximate query answer is returned in a shorter time than the time to return an exact answer. On the other hand, the answer is estimated and not exact, so a precision measure is also returned as a confidence interval that allows the user to decide if the accuracy of the response is sufficient. In general, this approximate answer is enough for many applications.
653 $aDatabase management systems
653 $aQuery processing in spatial databases
653 $aRaster signatures
700 1 $aZIMBRÃO, G.
700 1 $aSOUZA, J. M. de
773 $tIn: DAVID JUNIOR, C. A.; MONTEIRO, A. M. V. (Ed.). Advances in Geoinformatics. Berlin: Springer-Verlag, 2007.
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
13/01/2014 |
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Data da última atualização: |
20/10/2022 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MARTINS JUNIOR, H.; COSTA, S. M. da. |
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Afiliação: |
HEITOR MARTINS JUNIOR, CPATU; SAYMON MATOS DA COSTA, UFRA. |
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Título: |
Avaliação da inclusão da levedura (Saccharomyces cerevisiae) como suplemento, em dietas para juvenis de tambaqui (Colossoma macropomum). |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE AQUICULTURA DE ESPÉCIES NATIVAS, 4., 2013, Belém, PA. [Resumos]. [Belém, PA: s.n.], 2013. |
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Idioma: |
Português |
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Palavras-Chave: |
Suplementação. |
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Thesagro: |
Nutrição; Piscicultura. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/95123/1/AQUICULTURA8.pdf
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Marc: |
LEADER 00592nam a2200145 a 4500
001 1975730
005 2022-10-20
008 2013 bl uuuu u00u1 u #d
100 1 $aMARTINS JUNIOR, H.
245 $aAvaliação da inclusão da levedura (Saccharomyces cerevisiae) como suplemento, em dietas para juvenis de tambaqui (Colossoma macropomum).$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE AQUICULTURA DE ESPÉCIES NATIVAS, 4., 2013, Belém, PA. [Resumos]. [Belém, PA: s.n.]$c2013
650 $aNutrição
650 $aPiscicultura
653 $aSuplementação
700 1 $aCOSTA, S. M. da
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Embrapa Amazônia Oriental (CPATU) |
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