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 104 for “"Light detection and ranging (LiDAR)"”.
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Using Light Detection and Ranging (LiDAR) Imagery to Model Radio Wave Propagation
The purpose of this study was to determine if light detection and ranging (LiDAR) imagery could provide a significantly more accurate data set for modeling near line-of-sight (LOS) propagation at higher frequencies, specifically 27.810 GHz. than a USGS digital elevation model (DEM). In addition, …
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On the Determination of Building Footprints from LIDAR Data
… boundaries through automatic processing of light detection and ranging (LIDAR) data is presented. The LIDAR data is processed and interpolated into a grayscale image of intensity values corresponding to height measurements. Ground measurements are separated from non-ground measurements by …
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Integrated optical phased arrays for three-dimensional display applications
… integrated optical phased arrays (OPAs) for light detection and ranging (LiDAR) and free-space communications. However, silicon is limited to operating at infrared wavelengths since its bandgap prevents visible light transmission. The development of integrated OPAs for arbitrary complex …
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Multirotor UAS Sense and Avoid with Sensor Fusion
… Systems (UAS) are explored including obstacle detection, dynamic obstacle state estimation, and avoidance strategy. This area is explored in pursuit of determining the viability of UAS Sense and Avoid (SAA) in static and dynamic operational environments. This exploration is driven by dynamic …
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An application of LIDAR to examine erosion in the southern Monterey Bay during the 1997-98 El Nino
Light Detection and Ranging (LIDAR) was used in a Geographic Information System (GIS) to quantify coastal changes to beaches and dunes in the Southern Monterey Bay region and to qualitatively assess the erosional impact of large storms on coastal dune areas. LIDAR provides a rapid and accurate …
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A Study in Object Detection and Classification Performance by Sensing Modality for Autonomous Surface Vessels
… a quantitative performance comparison between light detection and ranging (LiDAR) and vision-based sensing for real-time maritime object detection on autonomous surface vessels. Using Embry-Riddle Aeronautical University’s (ERAU) Minion platform and 2024 Maritime RobotX Challenge data, this …
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Fusion Approaches to Individual Tree Species Classification Using Multi-Source Remotely Sensed Data
… essential roles in urban ecological management and sustainable development, and thus tree species classification has been an active research topic over the years. This study investigated fusion approaches deployed with Support Vector Machine (SVM) and Random Forest (RF) algorithms to …
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Elevation Changes in Greenland over Two Decades from Cross-Platform LIDAR Analysis
NASA’s Airborne Topographic Mapper (ATM) and the Land, Vegetation, and Ice Sensor (LVIS) are two airborne Light Detection and Ranging (LIDAR) systems that retrieve information about surface elevation and roughness. Both altimeters have been flown in Greenland to measure changes in ice sheet surface …
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Methods of determining stream setback corridors in urban watersheds from remotely sensed data in the Dallas metropolitan area, Texas.
… based from remotely sensed data, such as Light Detection and Ranging (LiDAR) with higher accuracy, as well as geological parameters such as channel material. Stream setbacks are easily calculated using computer-aided mapping technology, through the use of remotely sensed data and setbacks …
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Environment Mapping in Larger Spaces
… process of exploring a real world environment and creating its digital representation. To create convincing mixed reality programs, an environment mapping device must be able to detect a user's position and map the user's environment. Currently available commercial spatial mapping devices …
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Optical and structural characterization of crystalline oxides for laser applications
… lasers, especially those operating between 0.9 and 3.0 μm, has renewed general interest in the optical properties of rare-earth ions (Re3+) in crystalline oxides with garnet structure. At this purpose, the aim of this study concerns the optical and structural characterization of crystalline …
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Passive object recognition using intrinsic shape signatures
… Robotics Group (AR) at MIT's Computer Science and Artificial Intelligence Laboratories (CSAIL) has an autonomous, forklift capable of doing task planning, navigation, obstacle detection and avoidance, focused object detection, etc. The goal of the project is to have a completely autonomous …
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Design of a photonic crystal planar Luneburg lens for optical beam steering
… steering has numerous applications including light detection and ranging (LIDAR) for three-dimensional (3D) sensing, free space communications, additive manufacturing, and remote sensing. In particular, there is an increasing demand for LIDAR in a variety of applications including autonomous …
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Development of UAV-based lidar crop height mapping system
… Previous studies have indicated that a Light Detection and Ranging (LiDAR) sensor was capable of accurate and fast data collection. As technology of Unmanned Aerial Vehicles (UAV) advanced, the airborne LiDAR system became a promising remote sensing based method for non-destructive crop …
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The applications of autonomous systems to forestry management
Public and private timberland owners continually search for new, cost effective methods to monitor and nurture their timber stand investments. Common management tasks include monitoring tree growth and tree health, estimating timber value and preventing wildfire. Many of these tasks are both manual …
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Computational Dead Time Correction in Fluorescence Lifetime Imaging Microscopy (FLIM)
… tool in biomedical research. It can visualize and measure molecular interactions and cellular processes by analyzing the fluorescence decay of molecules in biological samples. Unlike traditional imaging methods based on fluorescence intensity, FLIM uses fluorescence lifetime - the time delay …
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Assessing the Technology Used by UAVs in Data Acquisition on Construction Sites
… of UAVs, cameras, thermographic scanners, and laser scanners with Light Detection and Ranging (LiDAR), this research will investigate how 3D Building Information Models (BIMs) can be created for real time project management decision making. UAVs with camera and laser scanning abilities will …
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Change in Shoreline Position for Two Consecutive Years Using LIDAR Along the Outer Banks, North Carolina
… line of dunes, is created for each 5 km section and shore-perpendicular profiles constructed every 20 meters in the alongshore direction. The profiles are obtained from two light detection and ranging (LIDAR) surveys performed in June 22, 2006 and July 7 and 8, 2007.</p><p>For five selected …
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Assessing the utility of NAIP digital aerial photogrammetric point clouds for estimating canopy height of managed loblolly pine plantations in the southeastern United States
… forest measurements, such as limiting costs and time in the field. Light detection and ranging (lidar) has been 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 …
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