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Title: Performance of laser-based electronic devices for structural analysis of Amazonian terra-firme forests
Authors: Pereira, Iokanam Sales
do Nascimento, Henrique E.Mendonça
Vicari, Matheus Boni
Disney, Mathias I.
DeLucia, Evan H.
null, Tomas
Kruijt, Bart J.
Lapola, David Montenegro
Meir, Patrick W.
Norby, Richard J.
Ometto, Jean Pierre Henry Balbaud
Quesada, Carlos Alberto
Rammig, Anja
Hofhansl, Florian
Keywords: Biomass
Electronic Equipment
Instrument Errors
Optical Radar
Remote Sensing
Systematic Errors
Thermoelectric Equipment
Carbon Storage
Forest Structure
Light Detection And Ranging
"terra Firme" Forest
Terrestrial Laser Scanning
Uncertainty Analysis
Issue Date: 2019
metadata.dc.publisher.journal: Remote Sensing
metadata.dc.relation.ispartof: Volume 11, Número 5
Abstract: Tropical vegetation biomass represents a key component of the carbon stored in global forest ecosystems. Estimates of aboveground biomass commonly rely on measurements of tree size (diameter and height) and then indirectly relate, via allometric relationships and wood density, to biomass sampled from a relatively small number of harvested and weighed trees. Recently, however, novel in situ remote sensing techniques have been proposed, which may provide nondestructive alternative approaches to derive biomass estimates. Nonetheless, we still lack knowledge of the measurement uncertainties, as both the calibration and validation of estimates using different techniques and instruments requires consistent assessment of the underlying errors. To that end, we investigate different approaches estimating the tropical aboveground biomass in situ. We quantify the total and systematic errors among measurements obtained from terrestrial light detection and ranging (LiDAR), hypsometer-based trigonometry, and traditional forest inventory. We show that laser-based estimates of aboveground biomass are in good agreement (< 10% measurement uncertainty) with traditional measurements. However, relative uncertainties vary among the allometric equations based on the vegetation parameters used for parameterization. We report the error metrics for measurements of tree diameter and tree height and discuss the consequences for estimated biomass. Despite methodological differences detected in this study, we conclude that laser-based electronic devices could complement conventional measurement techniques, thereby potentially improving estimates of tropical vegetation biomass. © 2019 by the authors.
metadata.dc.identifier.doi: 10.3390/rs11050510
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