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 137 for “"Light detection and ranging"”.
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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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Modeling Loblolly Pine Dominant Height Using Airborne LiDAR
… laser scanning technology, 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 …
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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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Aerial Lidar in the Archaeological Reconnaissance and Mapping Of Civil War Earthen Fortifications
… have the potential to provide researchers and the public a glimpse into the battles and strategies employed by Union and Confederate forces in throughout the conflict. With the ever increasing threat of losing these sites, the need to quickly and efficiently locate and map these …
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Improving Tree Crown Mapping using Airborne LiDAR with Genetic Algorithms
Landscape-scale 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 …
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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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Development of a Landing Period Indicator and the Use of Signal Prediction to Improve Landing Methodologies of Autonomous Unmanned Aerial Vehicles on Maritime Vessels
The scope of this thesis is the creation and evaluation of a methodology for improving the overall landing performance for UAVs using signal prediction and a developed Landing Period Indicator (LPI). The research is conducted in a synthetic environment, where the test vehicle is a quad-rotor UAV …
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Autonomous quadrotor unmanned aerial vehicle for culvert inspection
… (UAV) system for inspecting culverts. By expanding upon prior progress creating an autonomous indoor quadrotor, many basic hardware and software issues are solved. The main new functionality needed for the culvert inspection task was to utilize the Global Positioning System (GPS) available …
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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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Identifying Locations Of Highly Eroded Agricultural Land In The Devils Lake Basin, ND Using GIS Terrain Analysis Modeling
… potential due to the simplicity of the models, and the ease in running the analysis in a GIS. Terrain analysis of the upper Devils Lake basin was conducted using a 3-meter Light Detection and Ranging-derived digital elevation model. Portions of the Mauvais Coulee and Calio Coulee watersheds in …
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Estimating Vehicle Speed with Consumer Grade Mobile LiDAR
LiDAR (Light Detection and Ranging) is an emerging sensor technology that measures the time of flight of an emitted laser to measure the depth of surrounding objects. While historically LiDAR has been relegated to industrial and research spaces due to its prohibitive pricing and large form factor, …
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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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