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 79 for “"SFM"”.
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Advancing Arctic coastal erosion measurement and monitoring through UAV-SfM, satellite imagery, and object-based image analysis
… monitoring and quantification of erosion. UAV-SfM provides aerial and DSM imagery at unprecedented spatial and temporal resolution that provides perspectives and quantitative measures that are unachievable using conventional methods and very high resolution satellite imagery enables broader …
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A comparative analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetry for measuring fluvial sediments
… 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 employed both an …
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Evaluating the performance of multi-rotor UAV-Sfm imagery in assessing simple and complex forest structures: comparison to advanced remote sensing sensors
… 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 Breast Height (DBH) …
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Assessing the quantitative and qualitative differences between 3D point clouds produced from lidar and structure from motion
… 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 addition to lidar. Three UAS SfM models were produced to compare with …
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Involvement of CD133+ stem cells in the chemoresistance of glioma
… containing medium (SCM) and serum free medium (SFM). In SFM, the U87MG cells grew as neurospheres suggesting the presence of stem cells in this cell line while in the 1321N1 cells no neurospheres were observed. Immunocytochemistry and fluorescence-activated cell sorting (FACS) analysis revealed …
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Examination of the Potential of Structure-from-Motion Photogrammetry and Terrestrial Laser Scanning for Rapid Nondestructive Field Measurement of Grass Biomass
… 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 to destructively measured total AGB and grass AGB excluding …
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LOW-COST PHOTOGRAMMETRY SYSTEM FOR GEOREFERENCED STRUCTURE FROM MOTION
… 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 SFM typically acquire …
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Social norms, markets and land use in a developing country context
… to the adoption of soil fertility management (SFM) practices among small farmers. Though problems related to low and declining soil fertility continue to impede agricultural production and food security in Sub-Saharan Africa, smallholder farmers in this region have shown reluctance to adopt …
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Technological innovations in the collection and analysis of three-dimensional footwear impression evidence.
… to explore the veracity and application of SfM Photogrammetry (i.e., DigTrace) within forensic footwear. This portfolio-based research includes published papers integrated into conventional chapters. A method of comparing the accuracy and precision of different measurement methods is …
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Adoption of sustainable forestry practices by Non-Industrial Private Forest owners in Virginia
The concept of Sustainable Forest Management (SFM) has been promoted in the past few decades all over the world. Non-industrial private forest (NIPF) owners play an important role in that aspect in the U.S. because of their number (about 16 millions), the size of forest land under their control …
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Estimating Floodplain Vegetative Roughness using Drone-Based Laser Scanning and Structure from Motion Photogrammetry
… 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 data sets (DLS and SfM), …
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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 …
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Comparing UAV and Pole Photogrammetry for Monitoring Beach Erosion
… topographic surveying: Structure from Motion (SfM). Using a set of overlapping aerial photographs, the SfM workflow can generate accurate topographic surveys, and promises to provide a fast, inexpensive, and reliable method for routine beach surveying. Unmanned aerial vehicles (UAVs) are often …
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Effects of the Maillard reactions on chemical composition and amino acid digestibility of feed ingredients and on pig growth performance
… of AA in DDGS, canola meal, sunflower meal (SFM), and cottonseed meal (CSM) fed to pigs. The second objective was to develop regression equations that may be used to predict the concentration of SID AA in these ingredients from their nutrient composition. In Exp. 1, the SID of Lys was …
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Detection of Tornado Damage via Convolutional Neural Networks and Unmanned Aerial System Photogrammetry
… 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 indicate that a CNN …
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Short-term response of a mountain stream to a sediment pulse and a major flood
… 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 capabilities of both …
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Donkeys and Compost: Intermediate Transport and Soil Fertility Management in Northern Ghanaian Livelihoods
… capital use systems. Soil Fertility Management (SFM) is one such practice. Savanna farmers use organic and inorganic soil amendments. Although a strategy integrating both is most sustainable, compost use is limited by poor access to vehicles with which to carry it. This interdisciplinary study …
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Damage detection and monitoring for tunnel inspection based on computer vision
… The system relies on Structure from Motion (SFM), which enables the system to cope with images with a general camera motion, in contrast to standard mosaicing software that can cope only with a strict camera motion. The system involves the automatic robust estimation of a 3D cylindrical …
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An Investigation into Sustainable Forest Policies and Practices in Syria
… implementation of sustainable forest management (SFM) policy and practices in the semi-arid environment of Syria where such land is limited in extent (e.g. 3% forest and 57% rangeland) and yet where its high biodiversity value is of international significance. The thesis employs a variety of …
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Equilibrium and Dynamic Phase Behavior in Thin Films of Cylinder-Forming Block Copolymers
… by tapping mode scanning force microscopy (TM-SFM). We present a procedure to establish reliably with TM-SFM the true surface topography of a soft polymeric sample. The measurement of an array of amplitude phase distance (APD) curves enables us to distinguish quantitatively between the ¡°real¡± …
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