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 33 for “"Terrestrial Laser Scanning"”.
-
Terrestrial Laser Scanning for Quantifying Uncertainty in Fluvial Applications
… or remote sensing technologies, such as aerial laser scanning (ALS), which have limitations in spatial resolution. Terrestrial laser scanning (TLS) can potentially offer improvements over other surveying methods by providing greater resolution and accuracy. The first two objectives were to …
-
Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
… trees. This thesis presents techniques for using terrestrial laser scanning data to define crown profiles and describe within-crown heterogeneity in Pseudotusga menziesii, Pinus ponderosa, and Abies lasiocarpa of the Interior Northwest. Crown profiles were modeled using parametric curves applied …
-
Characterizing fuelbed structure, depth, and mass in a grassland using terrestrial laser scanning
… This thesis considers the application of Terrestrial Laser Scanning (TLS) for characterizing the structure, measuring depth and mass in a grassland fuelbed. It examines whether TLS can be used to quantify the vertical structure of a bunchgrass community in terms of bunch and seed head, and …
-
Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
… trees. This thesis presents techniques for using terrestrial laser scanning data to define crown profiles and describe within-crown heterogeneity in Pseudotusga menziesii, Pinus ponderosa, and Abies lasiocarpa of the Interior Northwest. Crown profiles were modeled using parametric curves applied …
-
Characterizing fuelbed structure, depth, and mass in a grassland using terrestrial laser scanning
… This thesis considers the application of Terrestrial Laser Scanning (TLS) for characterizing the structure, measuring depth and mass in a grassland fuelbed. It examines whether TLS can be used to quantify the vertical structure of a bunchgrass community in terms of bunch and seed head, and …
-
Evaluating the quality of ground surfaces generated from Terrestrial Laser Scanning (TLS) data
Researchers and GIS analysts have used Aerial Laser Scanning (ALS) data to generate Digital Terrain Models (DTM) since the 1990s, and various algorithms developed for ground point extraction have been proposed based on the characteristics of ALS data. However, Terrestrial Laser Scanning (TLS) data, …
-
Terrestrial laser scanning to characterise three-dimensional foliage and woody material distributions in trees
… forest ecosystems. The recent advances in terrestrial laser scanning (TLS) technologies have provided new opportunities to measure the 3D structure of forest canopies, which in turn can be correlated to tree attributes. In addition to estimation of variables such as stem density and the …
-
Creating 3D models of cultural heritage sites with terrestrial laser scanning and 3D imaging
The advent of terrestrial laser-scanners made the digital preservation of cultural heritage sites an affordable technique to produce accurate and detailed 3D-computermodel representations for any kind of 3D-objects, such as buildings, infrastructure, and even entire landscapes. However, one of the …
-
Investigating the Optimization of Terrestrial Laser Scanning Procedures for the Analysis of Concrete Bridge Pier Spalling
… Non-contact testing (NCT) technologies, such as terrestrial laser scanning (TLS) can be used to improve inspective efficiency and objectivity due to its high measurement accuracy, measurement speed, and interoperability with other technologies. By gathering point cloud data, TLS acts as a visual …
-
A comparative analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetry for measuring fluvial sediments
… has employed both an SfM-photogrammetry and Terrestrial Laser Scanning (TLS) approach in a comparative analysis of sediment grain size, where LiDAR-derived data has previously provided a reliable reference of grain size. Total Station EDM theodolite provided the parent coordinate system for …
-
Examination of the Potential of Structure-from-Motion Photogrammetry and Terrestrial Laser Scanning for Rapid Nondestructive Field Measurement of Grass Biomass
… the application of two recent technologies, Terrestrial Laser Scanning (TLS) and Structurefrom- Motion (SfM), in the development of rapid nondestructive AGB estimation of grassland plots. TLS and SfM volume metrics generated using a rasterized surface differencing method were linearly related …
-
Methods for constructing 3D geological and geophysical models of flood basalt provinces
… collected by a variety of methods including terrestrial laser scanning. Geophysical data are added to the models to make them suitable for generating synthetic seismic data. Flood basalt provinces contain a number of different volcanic facies, distinguished by their outcrop appearance and …
-
Motionless wide angle laser scanning for object detection and multi-spectral discrimination
Terrestrial laser screening has become an essential tool in may industries requiring digital three-dimensional reconstruction of an object or scene. These include civilian applications such as surveying, automobile collision avoidance, 3D animation modelling, mobile robot navigation, industrial …
-
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. …
-
On the Space Filling Nature of Trees: Clarifying and Validating a Model of Plant Architecture With Laser Scans of Tree Crowns
… of which is inscribed in branching architecture. Terrestrial Laser Scanning (TLS) provides new opportunities to map out the geometric complexity of branching architecture in tree crowns, and infer the physiological functioning of individuals using allometric theory for the scaling of size and …
-
Synergetic segmentation and registration of TLS point clouds using geometric and radiometric information
… frame or system. Since the appearance of Terrestrial Laser Scanning (TLS) – combined with quasi-area-based acquisition methods and the associated enormous amount of data in the form of so-called point clouds – in engineering geodesy and related fields such as architecture and civil …
-
Using LiDAR to measure subsurface movement of slow-moving landslides and study the interaction between the soil and LiDAR scanning targets
<p>"Terrestrial Laser Scanning (TLS) technology has been used for predicting and researching geological hazards for two decades. This research focuses on using LiDAR (Light Detection And Ranging) to measure the slow-moving displacement of both surface and subsurface soil of landslides. Two kinds of …
-
Development of LiDAR assisted terrestrial radar interferometry for rock deformation monitoring
… spatial areas. Remote sensing methods such as terrestrial laser scanning (TLS) and terrestrial radar interferometry (TRI) provide excellent spatial coverage, and with adequate post-data-processing software, sub-millimetric scale deformation sensitivity can be achieved.</p><p>This work will …
-
How Does Vegetation Movement During Laser Scanning Affect Common Point Cloud-Derived Metrics? A Virtual Laser Scanning Study
Close-range, high-resolution laser scanning is used in ecology, forestry and precision agriculture to assess plant health, structure, and productivity, and to monitor growth or regular movement patterns. A common problem in these applications is the wind-induced movement of vegetation during the …
-
Modeling Ozark Caves with Structure-from-Motion Photogrammetry: An Assessment of Stand-Alone Photogrammetry for 3-Dimensional Cave Survey
… also avoiding some of the major pitfalls of terrestrial laser scanning. The proposed method allows for the creation of 3D models which capture cave wall geometry, important cave formations, as well as providing the ability to create cross sections anywhere desired. The interactive 3D cave …
Page 1 of 2