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Navegando IESA - Artigos publicados em periódicos por Assunto "Aboveground biomass"
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Item Woody aboveground biomass mapping of the brazilian savanna with a multi-sensor and machine learning approach(2020) Bispo, Polyanna da Conceição; Rodríguez-Veiga, Pedro; Zimbres, Bárbara de Queiroz Carvalho; Miranda, Sabrina do Couto de; Cezare, Cassio Henrique Giusti; Fleming, Sam; Baldacchino, Francesca; Louis, Valentin; Rains, Dominik; Garcia, Mariano; Espírito-Santo, Fernando Del Bon; Roitman, Iris; Pacheco-Pascagaza, Ana María; Gou, Yaqing; Roberts, John; Barrett, Kirsten; Ferreira Junior, Laerte Guimaraes; Shimbo, Júlia Zanin; Alencar, Ane Auxiliadora Costa; Bustamante, Mercedes Maria da Cunha; Woodhouse, Iain Hector; Sano, Edson Eyji; Ometto, Jean Pierre Henry Balbaud; Tansey, Kevin; Balzter, HeikoThe tropical savanna in Brazil known as the Cerrado covers circa 23% of the Brazilian territory, but only 3% of this area is protected. High rates of deforestation and degradation in the woodland and forest areas have made the Cerrado the second-largest source of carbon emissions in Brazil. However, data on these emissions are highly uncertain because of the spatial and temporal variability of the aboveground biomass (AGB) in this biome. Remote-sensing data combined with local vegetation inventories provide the means to quantify the AGB at large scales. Here, we quantify the spatial distribution of woody AGB in the Rio Vermelho watershed, located in the centre of the Cerrado, at a high spatial resolution of 30 metres, with a random forest (RF) machine-learning approach. We produced the first high-resolution map of the AGB for a region in the Brazilian Cerrado using a combination of vegetation inventory plots, airborne light detection and ranging (LiDAR) data, and multispectral and radar satellite images (Landsat 8 and ALOS-2/PALSAR-2). A combination of random forest (RF) models and jackknife analyses enabled us to select the best remote-sensing variables to quantify the AGB on a large scale. Overall, the relationship between the ground data from vegetation inventories and remote-sensing variables was strong (R2 = 0.89), with a root-mean-square error (RMSE) of 7.58 Mg ha−1 and a bias of 0.43 Mg ha−1.