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.
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Showing 1 to 20 of 51 for “"Airborne LiDAR"”.
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Airborne lidar observations of tropospheric arctic clouds
… the PhD, elastic backscatter and depolarization lidar observations of Arctic clouds were performed during the international Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) from Svalbard in March and April 2007. Clouds were probed above the inaccessible Arctic Ocean with a …
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Modeling Loblolly Pine Dominant Height Using Airborne LiDAR
… known as light detection and ranging (or just LiDAR), over young and mature forest stands using regression analysis. LiDAR plot metrics were regressed against field measured dominant height using Best Subsets Regression to reduce the number of models. From those models, regression assumptions …
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Improving Tree Crown Mapping using Airborne LiDAR with Genetic Algorithms
… mapping of individual trees derived from LiDAR (Light Detection And Ranging) data have been found to be valuable for a wide range of environmental analyses including carbon inventories; fuel estimations for wildfire risk assessment and management. These mapping efforts use individual tree …
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Use of airborne lidar for boundary layer entrainment zone observations
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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DTM Generation in Forested Areas from Full-Waveform Airborne LiDAR Data
… Model (DTM) extraction from full-waveform LiDAR data. Specifically, the primary goal was to develop a novel method to improve DTM extraction by utilizing low amplitude pulses that are generated by terrain under vegetation, but undetectable using traditional Gaussian decomposition …
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Estimating Plot-Level Forest Biophysical Parameters Using Small-Footprint Airborne Lidar Measurements
… to facilitate the use of small-footprint lidar data for estimating forest biophysical parameters measuring individual trees identifiable on the three-dimensional lidar surface. This study derived the digital terrain model from lidar data using an iterative slope-based algorithm and …
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Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique
An Airborne Mobile Aerosol Lidar (AMALi) was constructed and built at Alfred-Wegener-Institute for Polar and Marine Research (AWI) in Potsdam, Germany for the lower tropospheric aerosol and cloud research under tough arctic conditions. The system was successfully used during two AWI airborne field …
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Recent Changes to Langjökull Icecap, Iceland: An investigation integrating airborne LiDAR and satellite imagery
… km$^{2}$), was the subject of an incomplete airborne LiDAR survey in August 2007. This study investigates and evaluates the application of photoclinometry, which employs visible light imagery (here, Landsat ETM+ band 4) to interpolate unmeasured sections of this fragmented data set. A …
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Identification of barriers and least cost paths for autonomous vehicle navigation using airborne LIDAR data
… System waypoints using no human guidance. Airborne LIDAR data and GIS can play a significant role in identifying barriers and least cost paths for such vehicles. Least cost paths minimize the sum of impedance across a surface. Impedance can be measured by steepness of slope, impenetrable …
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Wildfires for resilience in California’s Sierra Nevada: fine-scale assessment at regional scales with airborne lidar
… the high-resolution and synoptic coverage of airborne lidar to explore interactions between contemporary wildfires and dry forest ecosystems in California’s Sierra Nevada. For chapter one, I developed a geospatial dataset delineating sites where a frequent and low- to moderate-severity fire …
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Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements
… the ABL were measured with the nadir pointing Airborne Mobile Aerosol Lidar (AMALi) and dropsondes were launched to obtain profiles of meteorological variables. Furthermore, in situ measurements of aerosol properties, meteorological variables and turbulence were part of the campaign. The …
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Semantic classification of airborne LiDAR data. Built and landscape heritage analysis in 2D/3D GIS environment
L'abstract è presente nell'allegato / the abstract is in the attachment
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An Analysis and Critique of DEM Creaion and 3-D Modeling Using Airborne LIDAR and Photogrammetric Techniques
… using two of the methods, photogrammetry and LIDAR, are used to build digital terrain models in various software packages for an analysis of data usability and function. The key results of this research project are two DEMs of a real-world transportation study area and a set of conclusions and …
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Modeling Areal Measures of Campsite Impacts on the Appalachian National Scenic Trail, USA Using Airborne LiDAR and Field Collected Data
… modeled in GIS using high-resolution topography (LiDAR) data, on areal measures of campsite impact utilizing Least Absolute Shrinkage and Selection Operator (LASSO) penalized regression for factor selection and Ordinary Least Squares (OLS) for regressions. Chosen variables in regressions explained …
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Canopy structural and meteorological influences on CO2 exchange for MODIS product validation in a boreal jack pine chronosequence
… within these forests is not well understood. Airborne scanning light detection and ranging (lidar) instruments provide new opportunities to examine three-dimensional forest characteristics from the level of individual trees to ecosystems and beyond. Lidar is therefore an effective link between …
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Leaf and canopy responses to forest degradation and extreme climatic events: a remote sensing perspective
… forests modified by oil palm plantations using airborne LiDAR. The first chapter explores the potential and limitations of using hyperspectral data to estimate leaf traits remotely. Working with six temperate tree species in contrasting soil types, I explore the relationship between leaf …
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Sodium lidar studies of the horizontal variability of gravity waves in the mesosphere
… horizontal wavelength of a wave observed with an airborne lidar in November 1986 was estimated to be about 85 km, and the vertical wavelength was 4.1 km. The intrinsic period was about 1.7 hours, and the propagation direction was almost due south.
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