| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
17/02/2016 |
|
Data da última atualização: |
25/05/2022 |
|
Tipo da produção científica: |
Resumo em Anais de Congresso |
|
Autoria: |
VEIGA, J. C.; LEÃO, K. L.; QUEIROZ, A. C. M. de; MENEZES, C.; CONTRERA, F. A. L. |
|
Afiliação: |
Jamille Costa Veiga, UFPA; Kamila Leão Leão, ESTAGIÁRIA CPATU; ANA CAROLINA MARTINS DE QUEIROZ, CPATU; CRISTIANO MENEZES, CPATU; Felipe Andrés León Contrera, UFPA. |
|
Título: |
Reproductive quality of Melipona Flavolineata virgin queens (Apidae, Meliponini) and the importance of social context. |
|
Ano de publicação: |
2015 |
|
Fonte/Imprenta: |
In: ENCONTRO SOBRE ABELHAS, 11., 2015, Ribeirão Preto. Anais... Ribeirão Preto: USP: FCLRP, 2015. |
|
Páginas: |
p. 204. |
|
Idioma: |
Inglês |
|
Palavras-Chave: |
Interação. |
|
Thesagro: |
Abelha; Reprodução. |
|
Categoria do assunto: |
O Insetos e Entomologia |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/139287/1/p204.pdf
|
|
Marc: |
LEADER 00657nam a2200193 a 4500
001 2037447
005 2022-05-25
008 2015 bl uuuu u00u1 u #d
100 1 $aVEIGA, J. C.
245 $aReproductive quality of Melipona Flavolineata virgin queens (Apidae, Meliponini) and the importance of social context.$h[electronic resource]
260 $aIn: ENCONTRO SOBRE ABELHAS, 11., 2015, Ribeirão Preto. Anais... Ribeirão Preto: USP: FCLRP$c2015
300 $ap. 204.
650 $aAbelha
650 $aReprodução
653 $aInteração
700 1 $aLEÃO, K. L.
700 1 $aQUEIROZ, A. C. M. de
700 1 $aMENEZES, C.
700 1 $aCONTRERA, F. A. L.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Roraima. |
|
Data corrente: |
17/05/2022 |
|
Data da última atualização: |
17/05/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
PRUDENTE, V. H. R.; SKAKUN, S.; OLDONI, L. V.; XAUD, H. A. M.; XAUD, M. R.; ADAMI, M.; SANCHES, I. D. A. |
|
Afiliação: |
HARON ABRAHIM MAGALHAES XAUD, CPAF-RR; MARISTELA RAMALHO XAUD, CPAF-RR. |
|
Título: |
Multisensor approach to land use and land cover mapping in Brazilian Amazon. |
|
Ano de publicação: |
2022 |
|
Fonte/Imprenta: |
ISPRS Journal of Photogrammetry and Remote Sensing, v. 189, p. 95-109, 2022. |
|
ISSN: |
0924-2716/ |
|
DOI: |
https://doi.org/10.1016/j.isprsjprs.2022.04.025 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Remote sensing has an important role in the Land Use and Land Cover (LULC) mapping process worldwide. Combining spaceborne optical and microwave data is essential for accurate classification in areas with frequent cloud cover, such as tropical regions. In this study, we investigate the possible improvements, when SAR data is incorporated into the classification process along with optical data. We used MSI/Sentinel-2 and SAR/Sentinel-1 to provide LULC mapping in the Roraima State, Brazil, in 2019. This State is located in a tropical area, where the cloud cover is frequent over the year. Cloud cover becomes substantial, especially during the May-August period when crops are grown. Twenty-nine scenarios involving a combination of optical- and SAR-based features, as well as times of data acquisition, were considered in this study. Our results showed that optical or SAR data used individually are not enough to provide accurate LULC mapping. The best results in terms of overall accuracy (OA) were achieved using metrics of multi-temporal surface reflectance and vegetation index (VI) for optical imagery, and values of backscatter coefficient in different polarizations and their ratios yielding an OA of 86.41 ± 1.74%. Analysis of three periods of data (January to April, May to August, and September to December) used for classification allowed us to identify the optimal period for distinguishing specific classes. When comparing our LULC map with a LULC product derived within the MapBiomas project we observed that our method performed better to map annual and perennial crops and water classes. Our methodology provides a more accurate LULC for the Roraima State, and the proposed technique can be applied to benefit other regions that are affected by persistent cloud cover. MenosRemote sensing has an important role in the Land Use and Land Cover (LULC) mapping process worldwide. Combining spaceborne optical and microwave data is essential for accurate classification in areas with frequent cloud cover, such as tropical regions. In this study, we investigate the possible improvements, when SAR data is incorporated into the classification process along with optical data. We used MSI/Sentinel-2 and SAR/Sentinel-1 to provide LULC mapping in the Roraima State, Brazil, in 2019. This State is located in a tropical area, where the cloud cover is frequent over the year. Cloud cover becomes substantial, especially during the May-August period when crops are grown. Twenty-nine scenarios involving a combination of optical- and SAR-based features, as well as times of data acquisition, were considered in this study. Our results showed that optical or SAR data used individually are not enough to provide accurate LULC mapping. The best results in terms of overall accuracy (OA) were achieved using metrics of multi-temporal surface reflectance and vegetation index (VI) for optical imagery, and values of backscatter coefficient in different polarizations and their ratios yielding an OA of 86.41 ± 1.74%. Analysis of three periods of data (January to April, May to August, and September to December) used for classification allowed us to identify the optimal period for distinguishing specific classes. When comparing our LULC map with a LULC product derived within the MapBi... Mostrar Tudo |
|
Palavras-Chave: |
Multilayer Perceptron; Random Forest; Roraima state; Sentinel images. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1143151/1/1-s2.0-S0924271622001289-main.pdf
|
|
Marc: |
LEADER 02597naa a2200265 a 4500
001 2143151
005 2022-05-17
008 2022 bl uuuu u00u1 u #d
022 $a0924-2716/
024 7 $ahttps://doi.org/10.1016/j.isprsjprs.2022.04.025$2DOI
100 1 $aPRUDENTE, V. H. R.
245 $aMultisensor approach to land use and land cover mapping in Brazilian Amazon.$h[electronic resource]
260 $c2022
520 $aRemote sensing has an important role in the Land Use and Land Cover (LULC) mapping process worldwide. Combining spaceborne optical and microwave data is essential for accurate classification in areas with frequent cloud cover, such as tropical regions. In this study, we investigate the possible improvements, when SAR data is incorporated into the classification process along with optical data. We used MSI/Sentinel-2 and SAR/Sentinel-1 to provide LULC mapping in the Roraima State, Brazil, in 2019. This State is located in a tropical area, where the cloud cover is frequent over the year. Cloud cover becomes substantial, especially during the May-August period when crops are grown. Twenty-nine scenarios involving a combination of optical- and SAR-based features, as well as times of data acquisition, were considered in this study. Our results showed that optical or SAR data used individually are not enough to provide accurate LULC mapping. The best results in terms of overall accuracy (OA) were achieved using metrics of multi-temporal surface reflectance and vegetation index (VI) for optical imagery, and values of backscatter coefficient in different polarizations and their ratios yielding an OA of 86.41 ± 1.74%. Analysis of three periods of data (January to April, May to August, and September to December) used for classification allowed us to identify the optimal period for distinguishing specific classes. When comparing our LULC map with a LULC product derived within the MapBiomas project we observed that our method performed better to map annual and perennial crops and water classes. Our methodology provides a more accurate LULC for the Roraima State, and the proposed technique can be applied to benefit other regions that are affected by persistent cloud cover.
653 $aMultilayer Perceptron
653 $aRandom Forest
653 $aRoraima state
653 $aSentinel images
700 1 $aSKAKUN, S.
700 1 $aOLDONI, L. V.
700 1 $aXAUD, H. A. M.
700 1 $aXAUD, M. R.
700 1 $aADAMI, M.
700 1 $aSANCHES, I. D. A.
773 $tISPRS Journal of Photogrammetry and Remote Sensing$gv. 189, p. 95-109, 2022.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Roraima (CPAF-RR) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
