@Article{GraçaMaldSantKeiz:2015:MuAnRa,
author = "Gra{\c{c}}a, Paulo Mauricio Lima de Alencastro and Maldonado,
Francisco Dario and Santos, Jo{\~a}o Roberto dos and Keizer, E.
W. H.",
affiliation = "{Instituto Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and
{Universidad Aut{\'o}noma de Entre R{\'{\i}}os} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and Greenpeace",
title = "Multi-temporal analysis of radiometric changes in satellite images
of forest edges to infer selective-logging areas in the Amazon
forest [An{\'a}lise multitemporal das mudan{\c{c}}as
radiom{\'e}tricas em imagens de sat{\'e}lite de bordas de
foresta para inferir {\'a}reas de corte seletivo na foresta
Amaz{\^o}nica]",
journal = "Acta Amazonica",
year = "2015",
volume = "45",
number = "1",
pages = "35--44",
keywords = "timber exploitation, deforestation, remote sensing, forest
monitoring.",
abstract = "Radiometric changes observed in multi-temporal optical satellite
images have an important role in efforts to characterize
selective-logging areas. Te 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. Te method assumed that the radiometric
responses between forest with selective-logging effects and forest
edges in contact with recent clear-cuts are related. Te 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. Te attributes
for size and radiometric distance representing these two groups
were related to solar-elevation angle. Te 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.",
doi = "10.1590/1809-4392201401073",
url = "http://dx.doi.org/10.1590/1809-4392201401073",
issn = "0044-5967",
label = "scopus 2014-11 Gra{\c{c}}aMaldSantKeiz:2014:MuAnRa",
language = "en",
targetfile = "Multi temporal.pdf",
urlaccessdate = "27 abr. 2024"
}