@Article{FerreiraZorZanShiSou:2016:MaTrSp,
author = "Ferreira, Matheus Pinheiro and Zortea, Maciel and Zanotta, Daniel
Capella and Shimabukuro, Yosio Edemir and Souza Filho, Carlos
Roberto de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and Institute
of Informatics, Federal University of Rio Grande do Sul, Av. Bento
Gon{\c{c}}alves 9500, Porto Alegre, RS, Brazil and National
Institute for Science, Education and Technology, R. Eng. Alfredo
Huch 475, Rio Grande, RS, Brazil and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and Universidade Estadual de Campinas,
Institute of Geosciences, Campinas, Brazil",
title = "Mapping tree species in tropical seasonal semi-deciduous forests
with hyperspectral and multispectral data",
journal = "Remote Sensing of Environment",
year = "2016",
volume = "179",
number = "66",
pages = "66--78",
month = "Jun.",
keywords = "Brazilian Atlantic Forest, Classification, Imaging spectroscopy,
Individual tree crowns, WorldView-3.",
abstract = "Accurately mapping the spatial distribution of tree species in
tropical environments provides valuable insights for ecologists
and forest managers. This process may play an important role in
reducing fieldwork costs, monitoring changes in canopy
biodiversity, and locating parent trees to collect seeds for
forest restoration efforts. However, mapping tree species in
tropical forests with remote sensing data is a challenge because
of high floristic and spectral diversity. In this research, we
discriminated and mapped tree species in tropical seasonal
semi-deciduous forests (Brazilian Atlantic Forest Biome) by using
airborne hyperspectral and simulated multispectral data in the 450
to 2400 nm wavelength range. After quantifying the spectral
variability within and among individual tree crowns of eight
species, three supervised machine learning classifiers were
applied to discriminate the species at the pixel level. Linear
Discriminant Analysis outperformed Support Vector Machines with
Linear and Radial Basis Function (RBF-SVMs) kernels and Random
Forests in almost all the tested cases. An average classification
accuracy of 70% was obtained when using the visible/near-infrared
(VNIR, 450-919 nm) bands. The inclusion of shortwave infrared
bands (SWIR, 1045-2400 nm) increased the accuracy to 84%.
Narrow-band vegetation indices (VIs) were also tested and
increased the classification accuracy by up to 5% when combined
with VNIR features. Furthermore, the spectral bands of the
WorldView-3 (WV-3) satellite sensor were simulated for
classification purposes. WV-3 VNIR bands provided an accuracy of
57.4%, which increased to 74.8% when using WV-3 SWIR bands. We
also tested the production of species maps by using an
object-oriented approach that integrated a novel segmentation
algorithm that was tailored to delineate tree crowns and label
high class membership pixels inside each object. In this scenario,
RBF-SVMs produced the best species maps, correctly identifying
84.9% of crowns with hyperspectral data and 78.5% with simulated
WV-3 data. The use of a reduced set of hyperspectral bands, which
were selected with stepwise regression, did not significantly
affect the classification accuracies but allowed us to depict the
most important wavelengths to discriminate the species. These
wavelengths were located around the green reflectance peak (550
nm), at the red absorption feature (650 nm) and in the SWIR range
at 1200, 1700, 2100 and 2300 nm. These encouraging results suggest
the feasibility of the proposed approach for mapping pioneering
and climax tree species in the Brazilian Atlantic Forest Biome,
highlighting its potential use in forest recovery and inventory
initiatives.",
doi = "10.1016/j.rse.2016.03.021",
url = "http://dx.doi.org/10.1016/j.rse.2016.03.021",
issn = "0034-4257",
language = "en",
targetfile = "1_ferreira_mapping.pdf",
urlaccessdate = "27 abr. 2024"
}