Título:	Estimation of aboveground biomass stock in tropical savannas using photogrammetric imaging
Autor(es):	Queiroz, Roberta Franco Pereira de Oliveira, Marcus Vinicio Neves d’ Rezende, Alba Valéria Alencar, Paola Aires Lócio de
Afiliação do autor:	University of Brasília, Department of Forestry Brazilian Agricultural Research Company (EMBRAPA), Agroforestry Research Center of Acre University of Brasília, Department of Forestry University of Brasília, Department of Forestry
Assunto:	Sensoriamento remoto Cerrados - vegetação Mapeamento florestal Estoque de carbono Monitoramento ambiental
Data de publicação:	27-Jul-2023
Editora:	MDPI
Referência:	QUEIROZ, Roberta Franco Pereira de et al. Estimation of aboveground biomass stock in tropical savannas using photogrammetric imaging. Drones, [S. l.], v.7, n. 8, 2023. DOI: https://doi.org/10.3390/drones7080493.
Abstract:	The use of photogrammetry technology for aboveground biomass (AGB) stock estimation in tropical savannas is a challenging task and is still at a preliminary stage. This work aimed to use metrics derived from point clouds, constructed using photogrammetric imaging obtained by an RGB camera on board a remotely piloted aircraft (RPA), to generate a model for estimating AGB stock for the shrubby-woody stratum in savanna areas of Central Brazil (Cerrado). AGB stock was estimated using forest inventory data and an allometric equation. The photogrammetric digital terrain model (DTM) was validated with altimetric field data, demonstrating that the passive sensor can identify topographic variations in sites with discontinuous canopies. The inventory estimated an average AGB of 18.3 (±13.3) Mg ha−1 at the three sampled sites. The AGB model selected was composed of metrics used for height at the 10th and 95th percentile, with an adjusted R2 of 93% and a relative root mean squared error (RMSE) of 16%. AGB distribution maps were generated from the spatialization of the metrics selected for the model, optimizing the visualization and our understanding of the spatial distribution of forest AGB. The study represents a step forward in mapping biomass and carbon stocks in tropical savannas using low-cost remote sensing platforms.
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Florestal (FT EFL)
Programa de pós-graduação:	Programa de Pós-Graduação em Ciências Florestais
Licença:	© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
DOI:	https://doi.org/10.3390/drones7080493
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