@Article{PereiraKaSoEsBeVi:2018:ReUnMa,
author = "Pereira, Francisca Rocha de Souza and Kampel, Milton and Soares,
M{\'a}rio Luiz Gomes and Estrada, Gustavo Calderucio Duque and
Bentz, Cristina and Vincent, Gregoire",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual
do Rio de Janeiro (UERJ)} and {Golder Associates} and Petrobras
and {Universite Montpellier}",
title = "Reducing uncertainty in mapping of mangrove aboveground biomass
using airborne discrete return lidar data",
journal = "Remote Sensing",
year = "2018",
volume = "10",
number = "4",
pages = "e637",
month = "Apr.",
keywords = "discrete return lidar, mangrove, aboveground biomass,
uncertainty.",
abstract = "Remote sensing techniques offer useful tools for estimating forest
biomass to large extent, thereby contributing to the monitoring of
land use and landcover dynamics and the effectiveness of
environmental policies. The main goal of this study was to
investigate the potential use of discrete return light detection
and ranging (lidar) data to produce accurate aboveground biomass
(AGB) maps of mangrove forests. AGB was estimated in 34 small
plots scatted over a 50 km2 mangrove forest in Rio de Janeiro,
Brazil. Plot AGB was computed using either species-specific or
non-species-specific allometric models. A total of 26 descriptive
lidar metrics were extracted from the normalized height of the
lidar point cloud data, and various model forms (random forest and
partial least squares regression with backward selection of
predictors (Auto-PLS)) were tested to predict the recorded AGB.
The models developed using species-specific allometric models were
distinctly more accurate (R2 (calibration) = 0.89, R2 (validation)
= 0.80, root-mean-square error (RMSE, calibration) = 11.20
t·ha\−1 , and RMSE(validation) = 14.80 t·ha\−1 ).
The use of non-species-specific allometric models yielded large
errors on a landscape scale (+14% or \−18% bias depending
on the allometry considered), indicating that using poor quality
training data not only results in low precision but inaccuracy at
all scales. It was concluded that under suitable sampling pattern
and provided that accurate field data are used, discrete return
lidar can accurately estimate and map the AGB in mangrove forests.
Conversely this study underlines the potential bias affecting the
estimates of AGB in other forested landscapes where only
non-species-specific allometric equations are available.",
doi = "10.3390/rs10040637",
url = "http://dx.doi.org/10.3390/rs10040637",
issn = "2072-4292",
language = "en",
targetfile = "pereira_reducing.pdf",
urlaccessdate = "27 abr. 2024"
}