| Registro completo |
| Provedor de dados: |
Acta Amazonica
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| País: |
Brazil
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| Título: |
Multi-temporal analysis of radiometric changes in satellite images of forest edges to infer selective-logging areas in the Amazon forest
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| Autores: |
GRAÇA,Paulo Maurício Lima de Alencastro
MALDONADO,Francisco Dario
SANTOS,João Roberto dos
KEIZER,Edwin Willem Hermanus
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| Data: |
2015-03-01
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| Ano: |
2015
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| Palavras-chave: |
Timber exploitation
Deforestation
Remote sensing
Forest monitoring
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| Resumo: |
Radiometric changes observed in multi-temporal optical satellite images have an important role in efforts to characterize selective-logging areas. The aim of this study was to analyze the multi-temporal behavior of spectral-mixture responses in satellite images in simulated selective-logging areas in the Amazon forest, considering red/near-infrared spectral relationships. Forest edges were used to infer the selective-logging infrastructure using differently oriented edges in the transition between forest and deforested areas in satellite images. TM/Landsat-5 images acquired at three dates with different solar-illumination geometries were used in this analysis. The method assumed that the radiometric responses between forest with selective-logging effects and forest edges in contact with recent clear-cuts are related. The spatial frequency attributes of red/near infrared bands for edge areas were analyzed. Analysis of dispersion diagrams showed two groups of pixels that represent selective-logging areas. The attributes for size and radiometric distance representing these two groups were related to solar-elevation angle. The results suggest that detection of timber exploitation areas is limited because of the complexity of the selective-logging radiometric response. Thus, the accuracy of detecting selective logging can be influenced by the solar-elevation angle at the time of image acquisition. We conclude that images with lower solar-elevation angles are less reliable for delineation of selecting logging.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000100035
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| Editor: |
Instituto Nacional de Pesquisas da Amazônia
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| Relação: |
10.1590/1809-4392201401073
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| Formato: |
text/html
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| Fonte: |
Acta Amazonica v.45 n.1 2015
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| Direitos: |
info:eu-repo/semantics/openAccess
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