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| KUCK, T. N.; SANO, E. E.; BISPO, P. da C.; SHIGUEMORI, E. H.; SILVA FILHO, P. B. F.; MATRICARDI, E. A. T.. |
| Abstract: The near-real-time detection of selective logging in tropical forests is essential to support actions for reducing CO2 emissions and for monitoring timber extraction from forest concessions in tropical regions. Current operating systems rely on optical data that are constrained by persistent cloud-cover conditions in tropical regions. Synthetic aperture radar data represent an alternative to this technical constraint. This study aimed to evaluate the performance of three machine learning algorithms applied to multitemporal pairs of COSMO-SkyMed images to detect timber exploitation in a forest concession located in the Jamari National Forest, Rondônia State, Brazilian Amazon. The studied algorithms included random forest (RF), AdaBoost (AB), and... |
| Tipo: Artigo de periódico |
Palavras-chave: Desmatamento; Sensoriamento Remoto; Synthetic aperture radar. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1136170 |
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| MOURA, Y. M. de; BALZTER, H.; GALVÃO, L. S.; DALAGNOL, R.; ESPÍRITO-SANTO, F.; SANTOS, E. G.; GARCIA, M.; BISPO, P. da C.; OLIVEIRA JUNIOR, R. C. de; SHIMABUKURO, Y. E.. |
| Tropical forests hold significant amounts of carbon and play a critical role on Earth´s climate system. To date, carbon dynamics over tropical forests have been poorly assessed, especially over vast areas of the tropics that have been affected by some type of disturbance (e.g., selective logging, understory fires, and fragmentation). Understanding the multi-temporal dynamics of carbon stocks over human-modified tropical forests (HMTF) is crucial to close the carbon cycle balance in the tropics. Here, we used multi-temporal and high-spatial resolution airborne LiDAR data to quantify rates of carbon dynamics over a large patch of HMTF in eastern Amazon, Brazil. We described a robust approach to monitor changes in aboveground forest carbon stocks between 2012... |
| Tipo: Artigo de periódico |
Palavras-chave: Floresta Tropical; Carbono; Amazonia. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1127189 |
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| WIEDERKEHR, N. C.; GAMA, F. F.; CASTRO, P. B. N.; BISPO, P. da C.; BALZTER, H.; SANO, E. E.; SANTOS, J. R.; LIESENBERG, V.; MURA, J. C.. |
| We discriminated different successional forest stages, forest degradation, and land use classes in the Tapajós National Forest (TNF), located in the Central Brazilian Amazon. We used full polarimetric images from ALOS/PALSAR-2 that have not yet been tested for land use and land cover (LULC) classification, neither for forest degradation classification in the TNF. Our specific objectives were: (1) to test the potential of ALOS/PALSAR-2 full polarimetric images to discriminate LULC classes and forest degradation; (2) to determine the optimum subset of attributes to be used in LULC classification and forest degradation studies; and (3) to evaluate the performance of Random Forest (RF) and Support Vector Machine (SVM) supervised classifications to discriminate... |
| Tipo: Artigo de periódico |
Palavras-chave: Uso da Terra; Floresta; Degradação Ambiental; Amazonia. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1128151 |
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| BISPO, P. da C.; PARDINI, M.; PAPATHANASSIOU, K. P.; KUGLER, F.; BALZTER, H.; RAINS, D.; SANTOS, J. R. dos; RIZAEV, I. G.; TANSEY, K.; SILVA, M. F. da; ARAUJO, L. S. de. |
| Abstract: Knowledge of the spatial patterns of successional stages (i.e., primary and secondary forest) in tropical forests allows to monitor forest preservation, mortality and regeneration in relation to natural and anthropogenic disturbances. Different successional stages have also different capabilities of re-establishing carbon stocks. Therefore, a successful discrimination of successional stages over wide areas can lead to an improved quantification of above ground biomass and carbon stocks. The reduction of the mapping uncertainties is especially a challenge due to high heterogeneity of the tropical vegetation. In this framework, the development of innovative remote sensing approaches is required. Forests (top) height (and its spatial distribution)... |
| Tipo: Artigo de periódico |
Palavras-chave: Forest height; TanDEM-X.; Floresta Tropical; Mapa; Sensoriamento Remoto; Tropical forests; Forest succession; Height; Interferometry; Synthetic aperture radar.. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115303 |
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| BISPO, P. da C.; RODRÍGUEZ-VEIGA, P.; ZIMBRES, B.; MIRANDA, S. do C. de; CEZARE, C. H. G.; FLEMING, S.; BALDACCHINO, F.; LOUIS, V.; RAINS, D.; GARCIA, M.; ESPIRITO-SANTO, F. D. B.; ROITMAN, I.; PACHECO-PASCAGAZA, A. M.; GOU, Y.; ROBERTS, J.; BARRETT, K.; FERREIRA, L. G.; SHIMBO, J. Z.; ALENCAR, A.; BUSTAMANTE, M.; WOODHOUSE, I. H.; SANO, E. E.; OMETTO, J. P.; TANSEY, K.; BALZTER, H.. |
| The 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)... |
| Tipo: Artigo de periódico |
Palavras-chave: Biomassa; Cerrado; Sensoriamento Remoto; Carbono. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1128070 |
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