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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
02/03/2009 |
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Data da última atualização: |
25/08/2014 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
LU, D.; BATISTELLA, M.; MIRANDA, E. E. de. |
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Afiliação: |
DENGSHENG LU, Indiana University; MATEUS BATISTELLA, CNPM; EVARISTO EDUARDO DE MIRANDA, CNPM. |
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Título: |
A comparative study of landsat TM and SPOT HRG images of vegetation classification in the brazilian Amazon. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Photogrammetric Engineering & Remote Sensing, v. 74, n. 3, p. 311-321, mar. 2008. |
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Volume: |
v. 74 |
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ISBN: |
0099-1112 |
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Idioma: |
Inglês |
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Conteúdo: |
Complex forest structure and abundant tree species in the moist tropical regions often couse difficulties in classifying vegetation classes with remotely sensed data. This paper explores improvement in vegetation classification accuracies through a comparative study of different image combinations based on the integration of Landsat Thematic Mapper (TM) and SPOT High Resolution Geometric (HRG) instrument data, as well as the combination of spectral signatures and textures. A maximum likelihood classifier was used to classify the different image combinations into thematic maps. This research indicated that data fusion based on HBG multispectral and panchromatic data slightly improved vegetation classification accuracies: a 3.1 to 4.6 percent increase in the kappa coefficient compared with the classification results based on original HRG of TM multispectral images. A combination of HRG spectral signatures and two textural images improved the kappa coefficient by 6.3 percent compared with pure HRG multispectral images. The textural images based on entropy or second-moment texture measures with a window size of 9 pixels X 9 pixels played an important role in improving vegetation classification accuracy. Overall, optical remote-sensing data are still insufficient for accurate vegetation classifications in the Amazon basin. |
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Palavras-Chave: |
Brazilian Amazon; Comparative study; Landsat TM and SPOT HRG Images; Machadinho d´Oeste; Moist tropical regions. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/107253/1/2284.pdf
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Marc: |
LEADER 02068naa a2200241 a 4500
001 1031577
005 2014-08-25
008 2008 bl uuuu u00u1 u #d
022 $a0099-1112
100 1 $aLU, D.
245 $aA comparative study of landsat TM and SPOT HRG images of vegetation classification in the brazilian Amazon.
260 $c2008
300 $av. 74
490 $vv. 74
520 $aComplex forest structure and abundant tree species in the moist tropical regions often couse difficulties in classifying vegetation classes with remotely sensed data. This paper explores improvement in vegetation classification accuracies through a comparative study of different image combinations based on the integration of Landsat Thematic Mapper (TM) and SPOT High Resolution Geometric (HRG) instrument data, as well as the combination of spectral signatures and textures. A maximum likelihood classifier was used to classify the different image combinations into thematic maps. This research indicated that data fusion based on HBG multispectral and panchromatic data slightly improved vegetation classification accuracies: a 3.1 to 4.6 percent increase in the kappa coefficient compared with the classification results based on original HRG of TM multispectral images. A combination of HRG spectral signatures and two textural images improved the kappa coefficient by 6.3 percent compared with pure HRG multispectral images. The textural images based on entropy or second-moment texture measures with a window size of 9 pixels X 9 pixels played an important role in improving vegetation classification accuracy. Overall, optical remote-sensing data are still insufficient for accurate vegetation classifications in the Amazon basin.
653 $aBrazilian Amazon
653 $aComparative study
653 $aLandsat TM and SPOT HRG Images
653 $aMachadinho d´Oeste
653 $aMoist tropical regions
700 1 $aBATISTELLA, M.
700 1 $aMIRANDA, E. E. de
773 $tPhotogrammetric Engineering & Remote Sensing$gv. 74, n. 3, p. 311-321, mar. 2008.
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Registro original: |
Embrapa Territorial (CNPM) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
16/01/2008 |
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Data da última atualização: |
18/04/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
SILVA, S. A. da; SOUZA, P. I. de M. de; VIANNA, G. R.; LEONARDECZ, E.; MOREIRA, C. T.; FALEIRO, F. G.; NUNES JÚNIOR, J.; MONTEIRO, P. M. F. O.; RECH FILHO, E. L.; ARAGÃO, F. J. L. |
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Afiliação: |
SERGIO ABUD DA SILVA, CPAC; PLINIO ITAMAR DE MELLO DE SOUZA, CPAC; GIOVANNI RODRIGUES VIANNA, CENARGEN; E. LEONARDECZ, UNIVERSIDADE CATÓLICA DE BRASÍLIA; CLAUDETE TEIXEIRA MOREIRA, CPAC; FABIO GELAPE FALEIRO, CPAC; J. NUNES JÚNIOR, CENTRO TECNOLÓGICO PARA PESQUISAS AGROPECUÁRIAS; P. M. F. O. MONTEIRO; ELIBIO LEOPOLDO RECH FILHO, CENARGEN; FRANCISCO JOSE LIMA ARAGAO, CENARGEN. |
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Título: |
Gene flow from transgenic to nontransgenic soybean plants in the Cerrado region of Brazil. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Genetics and Molecular Research, v. 6, n. 2, p. 345-352, 2007. |
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ISSN: |
1676-5680 |
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Idioma: |
Inglês |
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Conteúdo: |
Evaluation of transgenic crops under field conditions is a fundamental step for the production of genetically engineered varieties. In order to determine if there is pollen dispersal from transgenic to nontransgenic soybean plants, a field release experiment was conducted in the Cerrado region of Brazil. Nontransgenic plants were cultivated in plots surrounding Roundup Ready transgenic plants carrying the cp4 epsps gene, which confers herbicide tolerance against glyphosate herbicide, and pollen dispersal was evaluated by checking for the dominant gene. The percentage of cross-pollination was calculated as a fraction of herbicide-tolerant and -nontolerant plants. The greatest amount of transgenic pollen dispersion was observed in the first row, located at one meter from the central (transgenic) plot, with a 0.52% average frequendecy. The frequency of pollen dispersion decreased to 0.12% in row 2, reaching 0% when the plants were up to 10 m distance from the central plot. Under these conditions pollen flow was higher for a short distance. This fact suggests that the management necessary to avoid cross-pollination from transgenic to nontransgenic plants in the seed production fields should be similar to the procedures currently utilized to produce commercial seeds. |
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Palavras-Chave: |
Transgênico. |
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Thesagro: |
Cerrado; Genética Vegetal; Glycine Max; Planta Transgênica; Soja. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02159naa a2200313 a 4500
001 1566764
005 2024-04-18
008 2007 bl uuuu u00u1 u #d
022 $a1676-5680
100 1 $aSILVA, S. A. da
245 $aGene flow from transgenic to nontransgenic soybean plants in the Cerrado region of Brazil.
260 $c2007
520 $aEvaluation of transgenic crops under field conditions is a fundamental step for the production of genetically engineered varieties. In order to determine if there is pollen dispersal from transgenic to nontransgenic soybean plants, a field release experiment was conducted in the Cerrado region of Brazil. Nontransgenic plants were cultivated in plots surrounding Roundup Ready transgenic plants carrying the cp4 epsps gene, which confers herbicide tolerance against glyphosate herbicide, and pollen dispersal was evaluated by checking for the dominant gene. The percentage of cross-pollination was calculated as a fraction of herbicide-tolerant and -nontolerant plants. The greatest amount of transgenic pollen dispersion was observed in the first row, located at one meter from the central (transgenic) plot, with a 0.52% average frequendecy. The frequency of pollen dispersion decreased to 0.12% in row 2, reaching 0% when the plants were up to 10 m distance from the central plot. Under these conditions pollen flow was higher for a short distance. This fact suggests that the management necessary to avoid cross-pollination from transgenic to nontransgenic plants in the seed production fields should be similar to the procedures currently utilized to produce commercial seeds.
650 $aCerrado
650 $aGenética Vegetal
650 $aGlycine Max
650 $aPlanta Transgênica
650 $aSoja
653 $aTransgênico
700 1 $aSOUZA, P. I. de M. de
700 1 $aVIANNA, G. R.
700 1 $aLEONARDECZ, E.
700 1 $aMOREIRA, C. T.
700 1 $aFALEIRO, F. G.
700 1 $aNUNES JÚNIOR, J.
700 1 $aMONTEIRO, P. M. F. O.
700 1 $aRECH FILHO, E. L.
700 1 $aARAGÃO, F. J. L.
773 $tGenetics and Molecular Research$gv. 6, n. 2, p. 345-352, 2007.
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