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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
12/02/2015 |
Data da última atualização: |
12/02/2015 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
CARVALHO JÚNIOR, O. A. de; GUIMARÃES, R. F.; MONTGOMERY, D. R.; GILLESPIE, A. R.; GOMES, R. A. T.; MARTINS, E. de S.; SILVA, N. C. |
Afiliação: |
OSMAR ABÍLIO DE CARVALHO JÚNIOR; RENATO FONTES GUIMARÃES; DAVID R. MONTGOMERY; ALAN R. GILLESPIE; ROBERTO ARNALDO TRANCOSO GOMES; EDER DE SOUZA MARTINS, CPAC; NILTON CORREIA SILVA. |
Título: |
Karst depression detection using ASTER, ALOS/PRISM and SRTM-Derived digital elevation models in the Bambuí Group, Brazil. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Remote sensing, v. 6, p. 330-351, 2014. |
DOI: |
10.3390/rs6010330 |
Idioma: |
Inglês |
Conteúdo: |
Abstract: Remote sensing has been used in karst studies to identify limestone terrain, describe exokarst features, analyze karst depressions, and detect geological structures important to karst development. The aim of this work is to investigate the use of ASTER-, SRTM- and ALOS/PRISM-derived digital elevation models (DEMs) to detect and quantify natural karst depressions along the São Francisco River near Barreiras city, northeast Brazil. The study area is a karst landscape characterized by karst depressions (dolines), closed depressions in limestone, many of which contain standing water connected with the ground-water table. The base of dolines is typically sealed with an impermeable clay layer covered by standing water or herbaceous vegetation. We identify dolines by combining the extraction of sink depth from DEMs, morphometric analysis using GIS, and visual interpretation. Our methodology is a semi-automatic approach involving several steps: (a) DEM acquisition; (b) sink-depth calculation using the difference between the raw DEM and the corresponding DEM with sinks filled; and (c) elimination of falsely identified karst depressions using morphometric attributes. The advantages and limitations of the applied methodology using different DEMs are examined by comparison with a sinkhole map generated from traditional geomorphological investigations based on visual interpretation of the high-resolution remote sensing images and field surveys. The threshold values of the depth, area size and circularity index appropriate for distinguishing dolines were identified from the maximum overall accuracy obtained by comparison with a true doline map. Our results indicate that the best performance of the proposed methodology for meso-scale karst feature detection was using ALOS/PRISM data with a threshold depth > 2 m; areas > 13,125 m2 and circularity indexes > 0.3 (overall accuracy of 0.53). The overall correct identification of around half of the true dolines suggests the potential to substantially improve doline identification using higher-resolution LiDAR-generated DEMs. MenosAbstract: Remote sensing has been used in karst studies to identify limestone terrain, describe exokarst features, analyze karst depressions, and detect geological structures important to karst development. The aim of this work is to investigate the use of ASTER-, SRTM- and ALOS/PRISM-derived digital elevation models (DEMs) to detect and quantify natural karst depressions along the São Francisco River near Barreiras city, northeast Brazil. The study area is a karst landscape characterized by karst depressions (dolines), closed depressions in limestone, many of which contain standing water connected with the ground-water table. The base of dolines is typically sealed with an impermeable clay layer covered by standing water or herbaceous vegetation. We identify dolines by combining the extraction of sink depth from DEMs, morphometric analysis using GIS, and visual interpretation. Our methodology is a semi-automatic approach involving several steps: (a) DEM acquisition; (b) sink-depth calculation using the difference between the raw DEM and the corresponding DEM with sinks filled; and (c) elimination of falsely identified karst depressions using morphometric attributes. The advantages and limitations of the applied methodology using different DEMs are examined by comparison with a sinkhole map generated from traditional geomorphological investigations based on visual interpretation of the high-resolution remote sensing images and field surveys. The threshold values of the depth... Mostrar Tudo |
Palavras-Chave: |
Análise DEM; Brasil. |
Thesagro: |
Calcário; Sensoriamento remoto; Sistema de Informação Geográfica. |
Thesaurus Nal: |
Brazil; Geographic information systems; Karsts; Limestone; Remote sensing. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/117884/1/Karst-depression-Eder.pdf
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Marc: |
LEADER 03057naa a2200325 a 4500 001 2008550 005 2015-02-12 008 2014 bl uuuu u00u1 u #d 024 7 $a10.3390/rs6010330$2DOI 100 1 $aCARVALHO JÚNIOR, O. A. de 245 $aKarst depression detection using ASTER, ALOS/PRISM and SRTM-Derived digital elevation models in the Bambuí Group, Brazil. 260 $c2014 520 $aAbstract: Remote sensing has been used in karst studies to identify limestone terrain, describe exokarst features, analyze karst depressions, and detect geological structures important to karst development. The aim of this work is to investigate the use of ASTER-, SRTM- and ALOS/PRISM-derived digital elevation models (DEMs) to detect and quantify natural karst depressions along the São Francisco River near Barreiras city, northeast Brazil. The study area is a karst landscape characterized by karst depressions (dolines), closed depressions in limestone, many of which contain standing water connected with the ground-water table. The base of dolines is typically sealed with an impermeable clay layer covered by standing water or herbaceous vegetation. We identify dolines by combining the extraction of sink depth from DEMs, morphometric analysis using GIS, and visual interpretation. Our methodology is a semi-automatic approach involving several steps: (a) DEM acquisition; (b) sink-depth calculation using the difference between the raw DEM and the corresponding DEM with sinks filled; and (c) elimination of falsely identified karst depressions using morphometric attributes. The advantages and limitations of the applied methodology using different DEMs are examined by comparison with a sinkhole map generated from traditional geomorphological investigations based on visual interpretation of the high-resolution remote sensing images and field surveys. The threshold values of the depth, area size and circularity index appropriate for distinguishing dolines were identified from the maximum overall accuracy obtained by comparison with a true doline map. Our results indicate that the best performance of the proposed methodology for meso-scale karst feature detection was using ALOS/PRISM data with a threshold depth > 2 m; areas > 13,125 m2 and circularity indexes > 0.3 (overall accuracy of 0.53). The overall correct identification of around half of the true dolines suggests the potential to substantially improve doline identification using higher-resolution LiDAR-generated DEMs. 650 $aBrazil 650 $aGeographic information systems 650 $aKarsts 650 $aLimestone 650 $aRemote sensing 650 $aCalcário 650 $aSensoriamento remoto 650 $aSistema de Informação Geográfica 653 $aAnálise DEM 653 $aBrasil 700 1 $aGUIMARÃES, R. F. 700 1 $aMONTGOMERY, D. R. 700 1 $aGILLESPIE, A. R. 700 1 $aGOMES, R. A. T. 700 1 $aMARTINS, E. de S. 700 1 $aSILVA, N. C. 773 $tRemote sensing$gv. 6, p. 330-351, 2014.
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Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
01/04/2008 |
Data da última atualização: |
13/05/2024 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
AGUIAR, R. W. S. A.; MARTINS, E. S.; FERNANDEZ, R. S.; MELATTI, V. M.; FALCÃO, R.; MONNERAT, R. G.; RIBEIRO, B. M. |
Afiliação: |
RAFAEL WESLEY DE SOUZA AGUIAR; ÉRICA SOARES MARTINS; R. S. FERNANDEZ, UNIVERSIDADE DE BRASÍLIA; VIVIANE MONTAGNER MELATTI; ROSANA FALCÃO, EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA; ROSE GOMES MONNERAT SOLON DE PONTES, EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA; BERGMANN MORAIS RIBEIRO, UNIVERSIDADE DE BRASÍLIA. |
Título: |
Avaliação da toxicidade da proteína recombinante inseticida Cry2Ab de Bacillus thuringiensis subsp. Kurstaki contra larvas de S. frugiperda. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
In: SIMPÓSIO DE CONTROLE BIOLÓGICO, 10., 2007, Brasília, DF. Inovar para preservar a vida. Resumos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2007. |
Série: |
(Embrapa Recursos Genéticos e Biotecnologia. Documentos, 250). |
Idioma: |
Português |
Notas: |
ID 510. |
Palavras-Chave: |
Inseticida Cry2Ab; Larvas; Proteína recombinante; S frugiperda; Toxicidade; Virus recombinante; vSyncry2Ab. |
Thesagro: |
Bacillus Thuringiensis; Clonagem. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01070nam a2200301 a 4500 001 1189811 005 2024-05-13 008 2007 bl uuuu u01u1 u #d 100 1 $aAGUIAR, R. W. S. A. 245 $aAvaliação da toxicidade da proteína recombinante inseticida Cry2Ab de Bacillus thuringiensis subsp. Kurstaki contra larvas de S. frugiperda. 260 $aIn: SIMPÓSIO DE CONTROLE BIOLÓGICO, 10., 2007, Brasília, DF. Inovar para preservar a vida. Resumos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia$c2007 490 $a(Embrapa Recursos Genéticos e Biotecnologia. Documentos, 250). 500 $aID 510. 650 $aBacillus Thuringiensis 650 $aClonagem 653 $aInseticida Cry2Ab 653 $aLarvas 653 $aProteína recombinante 653 $aS frugiperda 653 $aToxicidade 653 $aVirus recombinante 653 $avSyncry2Ab 700 1 $aMARTINS, E. S. 700 1 $aFERNANDEZ, R. S. 700 1 $aMELATTI, V. M. 700 1 $aFALCÃO, R. 700 1 $aMONNERAT, R. G. 700 1 $aRIBEIRO, B. M.
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