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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
05/06/2023 |
Data da última atualização: |
05/06/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
COSTA, L. S.; SANO, E. E.; FERREIRA, M. E.; MUNHOZ, C. B. R.; COSTA, J. V. S.; ALVES JÚNIOR, L. R.; MELLO, T. R. B.; BUSTAMANTE, M. M. C. |
Afiliação: |
LUCAS SILVA COSTA; EDSON EYJI SANO, CPAC; MANUEL EDUARDO FERREIRA; CÁSSIA BEATRIZ RODRIGUES MUNHOZ; JOÃO VÍTOR SILVA COSTA; LEOMAR RUFINO ALVES JÚNIOR; THIAGO ROURE BANDEIRA DE MELLO; MERCEDES MARIA DA CUNHA BUSTAMANTE. |
Título: |
Woody plant encroachment in a seasonal tropical savanna: lessons about classifiers and accuracy from UAV images. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Remote Sensing, v. 15, n. 9, 2023. |
Páginas: |
p. 1-26 |
Idioma: |
Inglês |
Conteúdo: |
Abstract: Woody plant encroachment in grassy ecosystems is a widely reported phenomenon associated with negative impacts on ecosystem functions. Most studies of this phenomenon have been carried out in arid and semi-arid grasslands. Therefore, studies in tropical regions, particularly savannas, which are composed of grassland and woodland mosaics, are needed. Our objective was to evaluate the accuracy of woody encroachment classification in the Brazilian Cerrado, a tropical savanna. We acquired dry and wet season unmanned aerial vehicle (UAV) images using RGB and multispectral cameras that were processed by the support vector machine (SVM), decision tree (DT), and random forest (RF) classifiers. We also compared two validation methods: the orthomosaic and in situ methods. We targeted two native woody species: Baccharis retusa and Trembleya parviflora. Identification of these two species was statistically (p < 0.05) most accurate in the wet season RGB images classified by the RF algorithm, with an overall accuracy (OA) of 92.7%. Relating to validation assessments, the in situ method was more susceptible to underfitting scenarios, especially using an RF classifier. The OA was higher in grassland than in woodland formations. Our results show that woody encroachment classification in a tropical savanna is possible using UAV images and field surveys and is suggested to be conducted during the wet season. It is challenging to classify UAV images in highly diverse ecosystems such as the Cerrado; therefore, whenever possible, researchers should use multiple accuracy assessment methods. In the case of using in situ accuracy assessment, we suggest a minimum of 40 training samples per class and to use multiple classifiers (e.g., RF and DT). Our findings contribute to the generation of tools that optimize time and cost for the monitoring and management of woody encroachment in tropical savannas. MenosAbstract: Woody plant encroachment in grassy ecosystems is a widely reported phenomenon associated with negative impacts on ecosystem functions. Most studies of this phenomenon have been carried out in arid and semi-arid grasslands. Therefore, studies in tropical regions, particularly savannas, which are composed of grassland and woodland mosaics, are needed. Our objective was to evaluate the accuracy of woody encroachment classification in the Brazilian Cerrado, a tropical savanna. We acquired dry and wet season unmanned aerial vehicle (UAV) images using RGB and multispectral cameras that were processed by the support vector machine (SVM), decision tree (DT), and random forest (RF) classifiers. We also compared two validation methods: the orthomosaic and in situ methods. We targeted two native woody species: Baccharis retusa and Trembleya parviflora. Identification of these two species was statistically (p < 0.05) most accurate in the wet season RGB images classified by the RF algorithm, with an overall accuracy (OA) of 92.7%. Relating to validation assessments, the in situ method was more susceptible to underfitting scenarios, especially using an RF classifier. The OA was higher in grassland than in woodland formations. Our results show that woody encroachment classification in a tropical savanna is possible using UAV images and field surveys and is suggested to be conducted during the wet season. It is challenging to classify UAV images in highly diverse ecosystems such a... Mostrar Tudo |
Palavras-Chave: |
Drone; Invasão de plantas; Multiespectral. |
Thesagro: |
Cerrado; Pastagem; Sensoriamento Remoto. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1154248/1/Sano-WOODY-PLANT-ENCHROACHMENT-IN-A-SEASONAL-TROPICAL-SAVANNA-LESSONS.pdf
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Marc: |
LEADER 02740naa a2200289 a 4500 001 2154248 005 2023-06-05 008 2023 bl uuuu u00u1 u #d 100 1 $aCOSTA, L. S. 245 $aWoody plant encroachment in a seasonal tropical savanna$blessons about classifiers and accuracy from UAV images.$h[electronic resource] 260 $c2023 300 $ap. 1-26 520 $aAbstract: Woody plant encroachment in grassy ecosystems is a widely reported phenomenon associated with negative impacts on ecosystem functions. Most studies of this phenomenon have been carried out in arid and semi-arid grasslands. Therefore, studies in tropical regions, particularly savannas, which are composed of grassland and woodland mosaics, are needed. Our objective was to evaluate the accuracy of woody encroachment classification in the Brazilian Cerrado, a tropical savanna. We acquired dry and wet season unmanned aerial vehicle (UAV) images using RGB and multispectral cameras that were processed by the support vector machine (SVM), decision tree (DT), and random forest (RF) classifiers. We also compared two validation methods: the orthomosaic and in situ methods. We targeted two native woody species: Baccharis retusa and Trembleya parviflora. Identification of these two species was statistically (p < 0.05) most accurate in the wet season RGB images classified by the RF algorithm, with an overall accuracy (OA) of 92.7%. Relating to validation assessments, the in situ method was more susceptible to underfitting scenarios, especially using an RF classifier. The OA was higher in grassland than in woodland formations. Our results show that woody encroachment classification in a tropical savanna is possible using UAV images and field surveys and is suggested to be conducted during the wet season. It is challenging to classify UAV images in highly diverse ecosystems such as the Cerrado; therefore, whenever possible, researchers should use multiple accuracy assessment methods. In the case of using in situ accuracy assessment, we suggest a minimum of 40 training samples per class and to use multiple classifiers (e.g., RF and DT). Our findings contribute to the generation of tools that optimize time and cost for the monitoring and management of woody encroachment in tropical savannas. 650 $aCerrado 650 $aPastagem 650 $aSensoriamento Remoto 653 $aDrone 653 $aInvasão de plantas 653 $aMultiespectral 700 1 $aSANO, E. E. 700 1 $aFERREIRA, M. E. 700 1 $aMUNHOZ, C. B. R. 700 1 $aCOSTA, J. V. S. 700 1 $aALVES JÚNIOR, L. R. 700 1 $aMELLO, T. R. B. 700 1 $aBUSTAMANTE, M. M. C. 773 $tRemote Sensing$gv. 15, n. 9, 2023.
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Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Algodão. |
Data corrente: |
13/11/2014 |
Data da última atualização: |
24/11/2014 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
PEREIRA, J. R.; ALMEIDA, E. S. A. B. DE; ARAÚJO, W. P.; ZONTA, J. H.; OLIVEIRA, V. E. A.; FIRMINO, P. de T. |
Afiliação: |
JOSE RODRIGUES PEREIRA, CNPA; Érica Samara Araújo Barbosa de Almeida; Whéllyson Pereira Araújo; JOAO HENRIQUE ZONTA, CNPA; Vinícius Evangelista Alves Oliveira; PAULO DE TARSO FIRMINO, CNPA. |
Título: |
Características primárias da análise de crescimento não destrutiva do gergelim sob diferentes níveis de irrigação. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE MAMONA, 6.; SIMPÓSIO INTERNACIONAL DE OLEAGINOSAS ENERGÉTICAS, 3., 2014, Fortaleza. Energia e segurança alimentar na agricultura familiar: anais. Campina Grande, PB: Embrapa Algodão, 2014. |
Páginas: |
p. 120 |
ISSN: |
2177-6008 |
Idioma: |
Português |
Palavras-Chave: |
Consumo de água; Diâmetro caulinar. |
Thesagro: |
Altura; Área Foliar. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/112180/1/IRR115-p120.pdf
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Marc: |
LEADER 00865nam a2200229 a 4500 001 2000050 005 2014-11-24 008 2014 bl uuuu u00u1 u #d 022 $a2177-6008 100 1 $aPEREIRA, J. R. 245 $aCaracterísticas primárias da análise de crescimento não destrutiva do gergelim sob diferentes níveis de irrigação. 260 $aIn: CONGRESSO BRASILEIRO DE MAMONA, 6.; SIMPÓSIO INTERNACIONAL DE OLEAGINOSAS ENERGÉTICAS, 3., 2014, Fortaleza. Energia e segurança alimentar na agricultura familiar: anais. Campina Grande, PB: Embrapa Algodão$c2014 300 $ap. 120 650 $aAltura 650 $aÁrea Foliar 653 $aConsumo de água 653 $aDiâmetro caulinar 700 1 $aALMEIDA, E. S. A. B. DE 700 1 $aARAÚJO, W. P. 700 1 $aZONTA, J. H. 700 1 $aOLIVEIRA, V. E. A. 700 1 $aFIRMINO, P. de T.
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