Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 67 for “"Canopy height"”.
-
Assessing the utility of NAIP digital aerial photogrammetric point clouds for estimating canopy height of managed loblolly pine plantations in the southeastern United States
… shown to enable accurate estimates of forest height. Lidar does produce precise measurements for ground elevation and forest height, where and when it is available. However, it is expensive to collect and does not have wall-to-wall coverage in the United States. In this study, we estimated …
-
Tracking Forest Height Growth Over Time with ICESat-2 ATL08
… LiDAR system to estimate along-track ground and canopy heights above the WGS 84 ellipsoid. This mission provides repeat coverage in 100 m data segments across the globe. In this research, we used multiple years of ICESat-2 ATL08 data to identify canopy height growth over time across the forest …
-
Phenotyping Canola (Brassica napus L.) Agronomic Traits and Estimating Seed Yield Using Unoccupied Aerial Vehicle (UAV)-based Multispectral Imagery
… canola flowering number, flowering layer depth, canopy height, and seed yield using UAV-based multispectral imagery collected during the entire crop season. Canola field experiments were conducted using 56 diverse Brassica genotypes under diverse environments from 2016 to 2018 in central …
-
Spatial distribution of canopy gaps in a tropical forest landscape and its influence on the tree community
… In old growth tropical forests, the creation of canopy gaps by one or multiple tree falls is one of the main causes of disturbance and thus potentially one of the main drivers of forest dynamics (Swaine and Whitmore 1988). My thesis focuses on characterizing patterns of gap disturbance across a …
-
Turbulence structure of a model seagrass meadow
… the turbulence structure of a depth-limited canopy, a gap that presently exists in the knowledge concerning the interaction of a unidirectional flow with an assemblage of plants. The experiments were carried out in an open channel flume with a model seagrass canopy. Proper modeling of the …
-
Modeling Loblolly Pine Dominant Height Using Airborne LiDAR
<p>The dominant height of 73 georeferenced field sample plots were modeled from various canopy height metrics derived by means of a small-footprint laser scanning technology, known as light detection and ranging (or just LiDAR), over young and mature forest stands using regression analysis. LiDAR …
-
Large-area forest assessment and monitoring using disparate lidar datasets
… be combined with National Forest Inventory tree height data to generate a large-area canopy height model. A simple linear regression model was developed using two lidar-based metrics as predictors: the 85th percentile of heights of canopy first returns and the coefficient of variation of the …
-
Landscape forest modeling of the Luquillo Experimental Forest, Puerto Rico.
… by dominance of species of each forest type and canopy height. Parameters of the landscape model (MOSAIC) were calculated from multiple runs of FACET. These runs were determined by combining terrain variables (elevation and soil) and hurricane risk. MOSAIC runs were analyzed for distribution …
-
Spatiotemporal Factors Affecting the Occupancy and Phenology of a Declining Songbird (Bachman's Sparrow - Peucaea aestivalis) at the Western Extent of its Range
… nearest source population, and basal area when canopy height is high. Singing phenology is affected by photoperiod and precipitation, with singing occurring between January and October. These results highlight the optimal spatial and temporal conditions for this species to guide future …
-
Soil and vegetation recovery on abandoned paved roads in a humid tropical rain forest, Puerto Rico
… forest state for stem count, species richness, canopy height, and canopy cover characteristics. Basal area, understory cover, and diversity measures reached adjacent forest levels within 60 yr. Species composition remained disparate between road and forest. Adjacent forest conditions were the …
-
Building a Predictive Model of Delmarva Fox Squirrel (Sciurus niger cinereus) Occurrence Using Infrared Photomonitors
… (Pmean = 49 + 8.1, Amean = 33 + 5.5), understory height (Pmean = 11 m + 0.8, Amean = 9 m + 0.5), overstory canopy height (Pmean = 31 m + 0.6, Amean = 28 m + 0.6), percent overstory cover (Pmean = 82 + 3.9, Amean = 73 + 3.1), shrub stems/ha (Pmean = 8068 + 3218, Amean = 11,119 + 2189), and distance …
-
The use of airborne laser altimetry to estimate tropical forest basal area, volume, and biomass
… transects); 3) computer simulation of the forest canopy based on spatial and forest mensuration data available from the ground survey; 4) development of regression relationships between laser and ground measurements based on the simulated forest canopy; and 5) the use of these regressions with the …
-
Functional analysis and modelling of vegetation: plant functional types in a mesocosmos experiment and a mechanistic model
… of plant functional types using the 'Leaf-Height-Seed Scheme'. This classification scheme uses only the plant traits specific leaf area, plant height and seed weight. A trait hierarchy for the assembly of plant communities is formed in gradients of fertility and disturbance. The third part …
-
Winter movements and habitat use of northern saw-whet owls at Assateague Island, Maryland
… included number of stems 2.5 cm DBH, roost tree height, roost tree species, canopy cover, average canopy height, average shrub height, roost DBH, distance to nearest tree, and percent ground cover. Vegetation also was measured at a random in similar habitat. Logistic regression was used to …
-
Estimating above and below ground vegetation biomass and carbon storage across an intra-urban land-use gradient in mid-Missouri
… were shown to be significantly larger in DBH and canopy height than all other sites. Total estimated carbon storage was also largest within a bottomland hardwood forest (38,990.2kg) and smallest within a bottomland floodplain grassland site (15.9kg). Carbon storage estimates generated with i-tree …
-
Remote Sensing Characterization of Ecosystem Structure and Functional Types to Inform on Biodiversity Conservation in the Lowland Chocó Rainforest
… transitioning class. This chapter addresses how canopy height models developed from structure-from-motion compare to ground-based measurements of canopy structure. Key findings from this chapter establish associations between diurnal LST patterns above the canopy and below-canopy diurnal air …
-
Evaluation and Application of a New Shape-sensitive Metric Useful for Characterizing Both Spectral Curves and Lidar Waveforms
… and shortcomings of this new approach, leaf and canopy hyperspectral reflectance samples were simulated using the physicallybased models PROSPECT (a leaf model) and SAIL (a canopy model). Sensitivity analysis was conducted with the goal of understanding the sensitivity of the new framework to …
-
EXTRAÇÃO DE VARIÁVEIS DENDROMÉTRICAS DE FLORESTA URBANA UTILIZANDO DADOS DE LASER AEROTRANSPORTADO
… applied for tree detection: one based on the Canopy Height Model (CHM) and the other directly on the three-dimensional point cloud. To validate the results, a field survey was conducted using the Trees Count application, in addition to photointerpretation over an orthoimage. The variable …
-
Effects of Posidonia oceanica seagrass on nearshore waves and wave-induced flows.
… distribution of Posidonia patches, density and canopy height, as well as bed sediment type and bathymetry. In the flume, measurements were made of water surface elevation along the flume and oscillatory flows at 3 locations and 4 elevations, under several wave conditions, water depths and for 2 …
-
Development of image analysis techniques to enable low-cost tropical rain forest monitoring
… data in the context of restoration, looking at canopy structure, composition and dynamics. First, I introduce the context of tropical forest restoration, discussing the contribution of remote sensing to monitoring and understanding projects, with a focus on the recent developments around the use …
Page 1 of 4