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 39 for “"Structure from Motion (sfm)"”.
-
A comparative analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetry for measuring fluvial sediments
… over a broad range of scales, with Structure from Motion (SfM) techniques enabling production of precise DEMs based on point-clouds analogous to, and even denser than, those produced by LiDAR, at significantly reduced cost and convolution during post-processing. This study has …
-
An evaluation of Image-Based Modelling for metrically recording cultural heritage subjects suitably to enable further use in geomatics, geoinformatics, and digital humanities.
… Modelling (IBM) produces 3D models using Structure-from- Motion (SfM) to extrapolate geometry from sets of photographs in combination with additional spatial data for scaling and orientation. This project examines the extent to which such models of cultural heritage subjects may be created …
-
Detection of Tornado Damage via Convolutional Neural Networks and Unmanned Aerial System Photogrammetry
… tornado damage. UAS imagery, combined with Structure from Motion (SfM) output, can directly be used to train models to detect tornado damage. In this research, we develop a CNN that can classify tornado damage in forests using SfM-derived orthophotos and digital surface models. The findings …
-
Determination of evaporative flux from water and soil surfaces
… was to accurately determine evaporative flux from water and soil surfaces. The main research contributions of this research are summarized as follows: (i) a Bench-scale Atmospheric Simulator (BAS/BAS2) was developed to control artificially generated parameters for short time periods; (ii) a …
-
Assessing the quantitative and qualitative differences between 3D point clouds produced from lidar and structure from motion
… clouds and digital elevation products derived from Unmanned Aerial System (UAS) acquired Structure from Motion (SfM) as compared to those obtained from lidar data. If the accuracy of UAS SfM proves to be on the same order as lidar, the technique could be used more often in lieu of or in …
-
LOW-COST PHOTOGRAMMETRY SYSTEM FOR GEOREFERENCED STRUCTURE FROM MOTION
… objects and terrain, which is referred to as the structure from motion (SFM) solution. The re-constructed model has three-dimensional colorized surfaces. Integration of geo-referenced data into SFM allows for precise geo-registration, scaling and orienting of the object. Today, industrial users of …
-
Estimating Floodplain Vegetative Roughness using Drone-Based Laser Scanning and Structure from Motion Photogrammetry
… high-resolution drone laser scanning (DLS) and structure from motion (SfM) photogrammetry-derived vegetation heights at the Virginia Tech StREAM Lab to determine Manning's roughness coefficient. We utilized two calibrated approaches and a calculated approach to estimate roughness from the two …
-
Simultaneous Three-Dimensional Mapping and Geolocation of Road Surface
… The local road surface is generated by structure from motion (SFM) with multiple views and optimized by Bundle Adjustment (BA). A system is developed for the global reconstruction of 3D road surface. Using the system, the proposed technique globally reconstructs 3D road surface by …
-
Underwater Refractive Camera Calibration and 3D Scene Reconstruction
… then introduces an open-source refractive Structure-from-Motion (SfM) solution that integrates refraction throughout the reconstruction pipeline. Finally, a comprehensive offline monocular visual mapping system is established to enable drift-free, efficient 3D reconstruction of large-area …
-
Interpretation at the Controller's Edge: The Role of Graphical User Interfaces in Virtual Archaeology
… contextual information for 3D content such as structure-from-motion (SFM) models, and can represent the difference between "raw data" and thoughtful, skilled scholarly publications. This project explores the implications of a GUI created with the game engine Unity 3D (Unity) for a series of SFM …
-
Comparing UAV and Pole Photogrammetry for Monitoring Beach Erosion
… erosion can put people, homes, and other infrastructure at risk. To effectively manage beach resources and respond to erosion hazards, coastal managers must have a reliable means of surveying the beach to monitor erosion and accretion. These elevation surveys typically incorporate traditional …
-
Site characterization using drone based photogrammetry
… drones for rock mass characterization through Structure from Motion (SfM) photogrammetry. This study highlights a series of surveys utilizing a DJI Mavic II drone performed between July and August 2022 at an abandoned quarry in Clear Creek Canyon Park, located 0.25 miles west of Golden, …
-
An Evaluation of Historic Cement Stucco Using Conditions Assessment Methodology and Digital Visualization Tools, Grand Teton National Park, USA
… homestead is a vernacular, two story wood frame structure finished with pink-painted cementitious stucco. The National Park Service (NPS) has passively preserved the structure since 1990 and it still maintains a high degree of integrity. The John Moulton Homestead is a popular tourist attraction …
-
Automated image-based 3D reconstruction system for precise plant modeling
… to its irregularity in shapes and complexity in structure. In this thesis, we present an automated non-parametric system, which reconstructs a high-quality 3D dense point cloud for plants from video inputs that are taken in a casual setting. The input data can be easily collected using an …
-
Investigating rates and mechanisms of lateral erosion in a small bedrock river using erosion pins, structure-from-motion photogrammetry, and optically stimulated luminescence dating: Konza Prairie, northeast Kansas
… of lateral bedrock erosion. Erosion pins and structure from motion (SfM) were used to determine annual lateral erosion rates and spatio-temporal patterns of erosion along bedrock channel banks. Single-grain optically stimulated luminescence (OSL) dating of fluvial deposits overlying a strath …
-
Reconstruction of extended environments from image sequences
The automatic recovery of the three-dimensional structure of a scene from a sequence of two-dimensional images has been the subject of considerable research in the field of machine vision, with applications as wide-ranging as object recognition, virtual reality and robot navigation. Traditional …
-
Improve OpenMVG and create a novel algorithm for novel view synthesis from point clouds
… novel algorithm to render photorealistic images from new views given a photo collection and 3D point cloud. First, the original OpenMVG is parallelized using GPU and its data structure is optimized. Moreover, we integrated the MatchMiner algorithm into OpenMVG to further improve its efficiency. …
-
Evaluating the performance of multi-rotor UAV-Sfm imagery in assessing simple and complex forest structures: comparison to advanced remote sensing sensors
… of Unmanned Aerial Vehicles (UAVs) and Structure‐from‐Motion (SfM) photogrammetry in assessing forest structures for forest inventory and biomass estimations has shown great promise in reducing costs and labour intensity while providing relative accuracy. Tree Height (TH) and Diameter at …
-
Model-based metrics for assessing completeness and accuracy for 3D image-based reconstruction methods
Structure from Motion (SfM) is a technique for inferring the underlying 3D geometry of the real world from a set of unordered images using a pinhole camera model. Due to a wider availability of cameras, the availability of commodity smart phones and tablets equipped with cameras, and enhanced …
-
Short-term response of a mountain stream to a sediment pulse and a major flood
… sensing techniques, terrestrial LiDAR (TLS) and Structure-from-Motion (SfM). Data collected during two subsequent summers enabled me to map two reaches of Sullivan Creek and detect and track morphological change that took place between the surveys. I also carried out a comparative analysis of the …
Page 1 of 2