Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data
Main Author: | |
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Publication Date: | 1998 |
Other Authors: | , |
Format: | Article |
Language: | por |
Source: | Pesquisa Agropecuária Brasileira (Online) |
Download full: | https://seer.sct.embrapa.br/index.php/pab/article/view/5053 |
Summary: | The objective of this work was to evaluate areas covered by aquatic plants in ponds and temporary drainage channels through optical sensors. The area of study is part of the Nhecolândia subregion of the Brazilian Pantanal wetland and is characterized by ponds of fresh and salt-lakes waters, temporarily covered by aquatic macrophytes and algae. TM (Thematic Mapper)-Landsat digital image, from Aug. 26, 1993, and HRV-SPOT digital image, from June 12, 1987, were used. An overflight was made in the study area to obtain 35 mm photographs of some ponds, and field work was carried out to survey the spatial distribution and floristic composition of the aquatic plantas in the ponds. Algorithms of slicing and maximum likelihood classification were applied on selected ponds. Areas with predominance of Salvinia auriculata and Scirpus cubensis were well discriminated. Presence of aquatic plants was easily observed on Landsat bands 4 and 5. However the difficulty to distinguish areas occupied by different aquatic plants, through the use of data with spatial resolution of 20 to 30 meters, suggests that studies based on aerial photographs and radiometers may produce more detailed results. |
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Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT dataAvaliação da cobertura por plantas aquáticas em lagoas da sub-região da Nhecolândia no Pantanal por meio de dados Landsat e SPOTremote sensing; flora compositionsensoriamento remoto; composição florísticaThe objective of this work was to evaluate areas covered by aquatic plants in ponds and temporary drainage channels through optical sensors. The area of study is part of the Nhecolândia subregion of the Brazilian Pantanal wetland and is characterized by ponds of fresh and salt-lakes waters, temporarily covered by aquatic macrophytes and algae. TM (Thematic Mapper)-Landsat digital image, from Aug. 26, 1993, and HRV-SPOT digital image, from June 12, 1987, were used. An overflight was made in the study area to obtain 35 mm photographs of some ponds, and field work was carried out to survey the spatial distribution and floristic composition of the aquatic plantas in the ponds. Algorithms of slicing and maximum likelihood classification were applied on selected ponds. Areas with predominance of Salvinia auriculata and Scirpus cubensis were well discriminated. Presence of aquatic plants was easily observed on Landsat bands 4 and 5. However the difficulty to distinguish areas occupied by different aquatic plants, through the use of data with spatial resolution of 20 to 30 meters, suggests that studies based on aerial photographs and radiometers may produce more detailed results.Avaliaram-se, por meio de sensores no espectro óptico, áreas ocupadas por plantas aquáticas nas lagoas e nos canais de escoamento temporário de água. A área de estudo faz parte da sub-região da Nhecolândia e caracteriza-se por apresentar lagoas de água doce, de água salobra, salinas, corixos e vazantes, que são temporariamente ocupados por plantas aquáticas e algas. Utilizaram-se imagens digitais do Thematic Mapper (TM) do satélite Landsat, datada de 26/08/93 e HRV-SPOT, datada de 12/06/87. Realizou-se um sobrevôo na área de estudo para obtenção de fotos 35 mm de algumas baías, e realizaram-se trabalhos de campo para levantamento de informações sobre distribuição espacial e composição florística das plantas aquáticas nas baías. Algoritmos de classificação determinísticos (fatiamento) e probabilísticos (máxima verossimilhança) foram aplicados em baías selecionadas. Áreas com predominância de Salvinia auriculata e Scirpus cubensis foram bem discriminadas. A presença de plantas aquáticas foi facilmente observada nas bandas 4 e 5 do Landsat. No entanto, a dificuldade encontrada em diferenciar áreas ocupadas por plantas aquáticas, pela utilização de dados com resolução espacial de 20 a 30 metros, sugere que estudos com fotografias aéreas e radiômetros possam levar a resultados mais detalhados.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraAbdon, Myrian de MouraPott, Vali JoanaSilva, João dos Santos Vila1998-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/5053Pesquisa Agropecuaria Brasileira; v.33, n. especial, out. 1998; 1675-1681Pesquisa Agropecuária Brasileira; v.33, n. especial, out. 1998; 1675-16811678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/5053/7200info:eu-repo/semantics/openAccess2015-01-20T19:44:42Zoai:ojs.seer.sct.embrapa.br:article/5053Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2015-01-20T19:44:42Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data Avaliação da cobertura por plantas aquáticas em lagoas da sub-região da Nhecolândia no Pantanal por meio de dados Landsat e SPOT |
title |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
spellingShingle |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data Abdon, Myrian de Moura remote sensing; flora composition sensoriamento remoto; composição florística |
title_short |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
title_full |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
title_fullStr |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
title_full_unstemmed |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
title_sort |
Evaluation of aquatic coverage on ponds of Nhecolândia subregion in the Pantanal through Landsat and SPOT data |
author |
Abdon, Myrian de Moura |
author_facet |
Abdon, Myrian de Moura Pott, Vali Joana Silva, João dos Santos Vila |
author_role |
author |
author2 |
Pott, Vali Joana Silva, João dos Santos Vila |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Abdon, Myrian de Moura Pott, Vali Joana Silva, João dos Santos Vila |
dc.subject.por.fl_str_mv |
remote sensing; flora composition sensoriamento remoto; composição florística |
topic |
remote sensing; flora composition sensoriamento remoto; composição florística |
description |
The objective of this work was to evaluate areas covered by aquatic plants in ponds and temporary drainage channels through optical sensors. The area of study is part of the Nhecolândia subregion of the Brazilian Pantanal wetland and is characterized by ponds of fresh and salt-lakes waters, temporarily covered by aquatic macrophytes and algae. TM (Thematic Mapper)-Landsat digital image, from Aug. 26, 1993, and HRV-SPOT digital image, from June 12, 1987, were used. An overflight was made in the study area to obtain 35 mm photographs of some ponds, and field work was carried out to survey the spatial distribution and floristic composition of the aquatic plantas in the ponds. Algorithms of slicing and maximum likelihood classification were applied on selected ponds. Areas with predominance of Salvinia auriculata and Scirpus cubensis were well discriminated. Presence of aquatic plants was easily observed on Landsat bands 4 and 5. However the difficulty to distinguish areas occupied by different aquatic plants, through the use of data with spatial resolution of 20 to 30 meters, suggests that studies based on aerial photographs and radiometers may produce more detailed results. |
publishDate |
1998 |
dc.date.none.fl_str_mv |
1998-12-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/5053 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/5053 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/5053/7200 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.33, n. especial, out. 1998; 1675-1681 Pesquisa Agropecuária Brasileira; v.33, n. especial, out. 1998; 1675-1681 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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