Encontrados 10 documentos, a visualizar página 1 de 1
Using bi-temporal ALS and NFI-based time-series data to account for large-scale...
Guerra-Hernández, Juan; Adrián, Pascual; Tupinambá-Simões, Frederico; Godinho, Sérgio; Botequim, Brigite; Jurado-Varela, Alfonso; Sandoval-AltelarreaNew remote-sensed biomass change products will transform our capacity to monitor and validate large-scale carbon dynamic in the next decade. In this study, we evaluated the use of multitemporal Airborne Laser Scanning (ALS) and the Climate Change Initiative (CCI) BIOMASS spaceborne mission to estimate AGB dynamics in different Mediterranean forest over an 8-year period (2010–2018). To do so, we evaluated differ...
Aboveground biomass mapping by integrating ICESat-2, SENTINEL-1, SENTINEL-2, AL...
Guerra-Hernández, Juan; Narine, Lana; Pascual, Adrian; Gonzalez-Ferreiro, Eduardo; Botequim, Brigite; Malambo, Lonesome; Neuenschwander, AmyThe Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) provides an extraordinary opportunity to support global large-scale forest carbon mapping, but further research is needed in order to obtain wall-to-wall forest aboveground biomass (AGB) maps with this technology. The effects of vegeta tion structure on the performance of canopy height and AGB modeling using ICESat-2 photon- counting light detection and ...
Impact of fire severity on forest structure and biomass stocks using NASA GEDI ...
Guerra-Hernández, Juan; Pereira, José M.C.; Stovall, Atticus; Pascual, AdrianWildfires have been progressively shrinking the C sink capacity of forest accelerating climate change effects on forest biodiversity, especially where megafires are recurrent and of increased frequency such as in the Medi- terranean. Data from The Global Ecosystem Dynamics Investigation (GEDI) mission can inform on changes on forest structure to inform on fire impacts on vegetation. In this study, we assessed t...
Assessing the Accuracy of GEDI Data for Canopy Height andAboveground Biomass Es...
Dorado-Roda, Iván; Pascual, Adrián; Godinho, Sérgio; Silva, Carlos A.; Botequim, Brigite; Rodríguez-Gonzálvez, Pablo; González-Ferreiro, EduardoGlobal Ecosystem Dynamics Investigation (GEDI) satellite mission is expanding the spatialbounds and temporal resolution of large-scale mapping applications. Integrating the recent GEDIdata into Airborne Laser Scanning (ALS)-derived estimations represents a global opportunity toupdate and extend forest models based on area based approaches (ABA) considering temporal andspatial dynamics. This study evaluates the ...
Assessing a novel modelling approach with high resolution UAV imagery for monit...
Guerra-Hernández, Juan; Diaz-Varela, Ramón A.; Alvarez-González, Juan Gabriel; Rodríguez-González, Patrícia MariaBackground: Black alder (Alnus glutinosa) forests are in severe decline across their area of distribution due to a disease caused by the soil-borne pathogenic Phytophthora alni species complex (class Oomycetes), “alder Phytopththora”. Mapping of the different types of damages caused by the disease is challenging in high density ecosystems in which spectral variability is high due to canopy heterogeneity. Data o...
Estimating Stand and Fire-Related Surface and Canopy Fuel Variables in Pine Sta...
Alonso-Rego, Cecilia; Arellano-Pérez, Stéfano; Guerra-Hernández, Juan; Molina-Valero, Juan Alberto; Martinez-Calvo, Adela; Pérez-Cruzado, CésarIn this study, we used data from a thinning trial conducted on 34 different sites and 102 sample plots established in pure and even-aged Pinus radiata and Pinus pinaster stands, to test the potential use of low-density airborne laser scanning (ALS) metrics and terrestrial laser scanning (TLS) metrics to provide accurate estimates of variables related to surface and canopy fires. An exhaustive field inventory wa...
Assessing the accuracy of GEDI data from canopy height and aboveground biomass ...
Dorado-Roda, Ivan; Pascual, Adrián; Godinho, Sérgio; Silva, Carlos A.; Botequim, Brigite; Rodríguez-Gonzálvez, Pablo; González-Ferreiro, EduardoGlobal Ecosystem Dynamics Investigation (GEDI) satellite mission is expanding the spatial bounds and temporal resolution of large-scale mapping applications. Integrating the recent GEDI data into Airborne Laser Scanning (ALS)-derived estimations represents a global opportunity to update and extend forest models based on area based approaches (ABA) considering temporal and spatial dynamics. This study evaluates ...
Forest road detection using LiDAR data and hybrid classification
Buján, Sandra; Guerra-Hernández, Juan; González-Ferreiro, Eduardo; Miranda, DavidKnowledge about forest road networks is essential for sustainable forest management and fire management. The aim of this study was to assess the accuracy of a new hierarchical-hybrid classification tool (HyClass) for mapping paved and unpaved forest roads with LiDAR data. Bareearth and low-lying vegetation were also identified. For this purpose, a rural landscape (area 70 ha) in northwestern Spain was selected ...
Predicting growing stock volume of Eucalyptus plantations using 3-D point cloud...
Guerra-Hernández, Juan; Cozensa, Diogo N.; Cardil, Adrian; Silva, Carlos Alberto; Botequim, Brigite; Soares, Paula; Silva, MargaridaEstimating forest inventory variables is important in monitoring forest resources and mitigating climate change. In this respect, forest managers require flexible, non-destructive methods for estimating volume and biomass. High-resolution and low-cost remote sensing data are increasingly available to measure three-dimensional (3D) canopy structure and to model forest structural attributes. The main objective of...
Using high resolution UAV imagery to estimate tree variables in Pinus pinea pla...
Guerra-Hernández, Juan; González-Ferreiro, Eduardo; Sarmento, Alexandre; Silva, João; Nunes, Alexandra; Correia, Alexandra C.; Fontes, LuísAim of study: The study aims to analyse the potential use of lowcost unmanned aerial vehicle (UAV) imagery for the estimation of Pinus pinea L. variables at the individual tree level (position, tree height and crown diameter). Area of study: This study was conducted under the PINEA project focused on 16 ha of umbrella pine afforestation (Portugal) subjected to different treatments. Material and methods: The wor...