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 51 for “"Laser scanner"”.
-
Modeling Forest Canopy Distribution from Ground-Based Laser Scanner Data
… available, tripod mounted, ground-based laser scanner was used to assess forest canopies and measure individual tree parameters. The instrument is comparable to scanning airborne light detection and ranging (lidar) technology but gathers data at higher resolution over a more limited …
-
Land Cover and Impervious Surface Mapping Using Multispectral Airborne Laser Scanner Data
… ability to scan the ground at three different laser wavelengths simultaneously. The multispectral point cloud has the capability of being used as the sole source of data for land cover classification because they can simultaneously provide both spectral and geometric information. This …
-
Discovetree - An Automated Tool To Generate Stem Maps From Terrestrial Laser Scanner Point Clouds
Terrestrial laser scanning (TLS) is increasingly used in forestry to quickly and nondestructively capture a variety of tree attributes such as diameter, height, and volume. However, in order for these attributes to be measured, the individual trees must first be segmented from the point cloud. …
-
Laser scanner jitter characterization, page content analysis for optimal rendering, and understanding image graininess
… is widely used in imaging systems such as laser printers and office copiers. In the EP process, laser scanner jitter is a common artifact that mainly appears along the scan direction due to the condition of polygon facets. Prior studies have not focused on the periodic characteristic of …
-
Quantifying structural change in UK woodland canopies with a dual-wavelength full-waveform terrestrial laser scanner
… for future climatic scenarios. Terrestrial Laser Scanning (TLS) has shown its potential to provide such measurements, offering a new approach to monitoring how forest systems change through time and space. The overall aim of this thesis was to improve the characterisation of the seasonal …
-
The understanding, characterization, and implementation of a SICK LMS-291 laser scanner for use in an experimental environment
… also intensified. One such device is the SICK Laser Measurement System (LMS). Based on a time-of-flight measurement principle, this sensor allows for centimeter resolution. This thesis presents a basic understanding and characterization of the laser measurement system necessary for successful …
-
An Approach to 3D Building Model Reconstruction from Airborne Laser Scanner Data Using Parameter Space Analysis and Fusion of Primitives
… approach was developed, which utilises airborne laser scanner data in order to generate 3D building models. These 3D building models may be used for technical and environmental planning. The approach has to follow certain requirements such as working automatically and robust and being flexible in …
-
Analysis of investments in process control tools : laser scanner used for on-line inspection in a polyester sheet production process
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1995.
-
Il ruolo della Rappresentazione e del Rilievo in Archeologia: dalle origini al Laser Scanner 3D - L'esperienza sulla Tricora di San Lorenzo Vecchio (SR)
… archeologici, attraverso l'uso della tecnologia Laser Scanner e l'ausilio della Fotogrammetria, le quali incrementano e non sostituiscono i tradizionali sistemi di acquisizione e restituzione. Si è riscontrato come l'uso della terza dimensione e della modellazione digitale in archeologia, …
-
Establishment of Accuracy Testing Facilities for Terrestrial Laser Scanners
… at the required level of accuracy. A Terrestrial Laser Scanner is one such instrument and with the vast amount of information that this machine is able to capture, it is especially important to run regular accuracy checks. This research is building on the work that has been done by previous …
-
A Mobile Robotic Computing Platform For Three-dimensional Indoor Mappi
… low cost mobile robotic computing platform with laser scanner, for quickly mapping with high resolution, urban and/or indoor environments using a gyro-enhanced orientation sensor and selectable levels of detail. In addition, a low cost alternative solution to three-dimensional laser scanning is …
-
Calculating and Assessing Mobile Mapping System Point Density for Roadside Infrastructure Surveys
… of the point density that different scanner confgurations and scanner hardware settings will exhibit on objects at specific distances. Depending on the project requirements, obtaining the required point density impacts on survey time, processing time, data storage and is the …
-
An evaluation of computer assisted skull re-assembly using hand held and automated laser scanners
… produced by radiological CT or optical surface laser scans. The accuracy of CAD reassembly and the contribution the technologies of image production make to the process are largely unevaluated. This research uses four 3D models produced by a hand held laser scanner (Scorpion FASTSCAN by …
-
A precision laser scanning system for experimental modal analysis: its test and calibration
The Laser Doppler Velocimetry technique has been widely used for dynamic measurements and experimental modal analysis. A laser scanning system that provides position accuracy, speed, and flexibility plays a key role in this technique. This thesis gives an overview of various laser scanning …
-
Evaluating the Potential for Estimating Age of Even-aged Loblolly Pine Stands Using Active and Passive Remote Sensing Data
Data from an airborne laser scanner, a dual-band interferometric synthetic aperture radar (DBInSAR), and Landsat were evaluated for estimating ages of even-aged loblolly pine stands in Appomattox-Buckingham State Forest, Virginia, U.S.A. The DBInSAR data were acquired using the GeoSAR sensor in …
-
Use of Graded Laser Scanning to Generate Efficient Boundary Element Meshes
… at different resolutions using a (non-contact) laser scanner measurement to obtain the point clouds. Meshes of each object were generated in Rapidform and directly used in a boundary element stress analysis. In addition, the steam turbine blade was scanned using different scanning resolutions. …
-
Comparative Digital Examination of the Talocrural (ankle) Joint Provides Insight into Human bipedal locomotion
… talus). Using a high resolution 3-dimensional laser scanner (FARO Arm EDGE), digital models of these bones from a sample of humans (N=19), fossil hominins (4.4 million year old Ardipithecus ramidus, 3.2 Ma Australopithecus afarensis, 1.8 Ma Homo habilis), non-human primates (N=29), ursids …
-
Precision Navigation for Indoor Mobile Robots
… localization subsystem, based on a planar laser scanner, wheel encoders, a gyroscope and an <em>a priori</em> map, and a precision path execution system made up of a steering algorithm, a trajectory generator and a simplistic path planner. A 3D octree costmap based on the OctoMap library …
-
The Effect of Cracks and Geo-Morphology on Evaporation from Clay Soils.
… out where crack development was tracked using a laser scanner, as well as by pixel analysis of surface photographs. The drying test has shown that crack surfaces contributed at most to 6% of total evaporation before de-saturation and up to 63.4% after de-saturation. Results have also shown that …
-
Modeling Robotic Wire Arc Additive Manufacturing Process Using Machine Learning
… For characterization, a Cognex DS 1300R laser scanner will generate a 3D point cloud of the welds produced by the WAAM process with a resolution in the micrometer range.
Page 1 of 3