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 15 of 15 for “"OBIA"”.
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An object-based image analysis approach for detecting urban impervious surfaces
… classification accuracy between pixel-based and OBIA methods, (2) examine whether the object-based image analysis (OBIA) could better detect urban impervious surfaces, and (3) develop an automated, generalized OBIA classification method for impervious surfaces. <br><br> This study analyzed urban …
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Mapping vegetation with remote sensing and GIS data using object-based analysis and machine learning algorithms
… techniques. Object-based image analysis (OBIA) and machine learning algorithms are recent advances, which this thesis evaluates. OBIA and machine learning algorithms are first tested using a combination of multiple datasets for identifying individual tree species. These datasets include …
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Object-based image analysis for detecting landforms diagnostic of natural hazards
… of objects, such as object-based image analysis (OBIA), is desirable. In this thesis, I propose a topographic roughness measure derived from an airborne laser scanning (ALS) digital terrain model (DTM) and discuss its performance in detecting landforms principally diagnostic of natural hazards. I …
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A multi-temporal image analysis of habitat modification in the Coastal Watershed, NH
… techniques, such as object-based image analysis (OBIA) and multi-temporal image analysis, to create accurate land cover maps and corresponding fragmentation metrics. These products were then used to determine if habitats of interest in the Coastal Watershed were potentially more susceptible to …
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Integrating Digital Aerial Photography and Lidar-Derived Information For Object-Based Coastal Tidal Marsh Classification Using Tree-Based Ensemble Algorithms
… South Carolina. An object-based image analysis (OBIA) approach was adopted for mapping the following detailed tidal marsh classes: tall creekbank spartina alterniflora, intermediate spartina alterniflora, exposed mudflats, salicornia/short spartina and juncus roemerianus. A high-resolution …
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Propuesta metodológica para la planificación y gestión de los espacios protegidos red natura 2000, utilizando teledetección (análisis de imágenes en base a objetos) y sistemas de información geográfica = Methodological proposal for planning and managing protected natura 2000 areas, using remote sensing (object based image analysis) and geographic information systems.
… son el análisis de imágenes en base a objetos (OBIA). Los objetos, agrupaciones de píxeles, se clasifican mediante características espectrales, forma, tamaño, relaciones de contexto…imitando los procesos cognitivos. Se propone una “Metodología para la cartografía y gestión de los Espacios …
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Determining estuarine seagrass density measures from low altitude multispectral imagery flown by remotely piloted aircraft
… accuracy than object-based image analysis (OBIA) assessed at a range of segmentation scales. Contaminating objects such as shells and detritus can become aggregated within polygon objects when OBIA is applied but remain as isolated objects under PBIA at this image resolution. There was clear …
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Advancing Arctic coastal erosion measurement and monitoring through UAV-SfM, satellite imagery, and object-based image analysis
… while image classifications derived from OBIA, or GEOBIA, provide opportunities to systematically create boundary features (i.e. shoreline proxies). Overall, this doctoral research develops and evaluates techniques that enhance our ability to make quantitative measures of Arctic coastal …
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Data-driven methods for the extraction, grouping and application of terroir units
… the value of object-based image analysis (OBIA), finding it to be a highly effective alternative to pixel-based or vector overlay zoning methods. Further development of these methods could support viticultural zoning in South Africa, ensuring the sustainability of the Wine of Origin scheme …
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An Investigation of Evaluation Methods of Weighted-Point Landscaping Policy - in Seattle and Malmö
… a supervised Object Based Image Analysis (OBIA) and a vertical structure inventory, have the promise to be effective measurement tools given carefully chosen considerations and inputs. Applying these methods has the potential to inform a modified-BAR vegetation indicator useful for …
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ASSOCIATION MAPPING OF GENE REGIONS FOR DROUGHT TOLERANCE AND AGRONOMIC TRAITS IN SORGHUM
Genetic improvement of sorghum (Sorghum bicolor (L.) Moench) for drought tolerance and grain yield is challenging because of the complex nature of these traits. To make this process more tractable, studies were conducted to investigate the genetic architecture of these traits by employing a novel …
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Latent Dirichlet Variational Autoencoder: a novel approach for hyperspectral image analysis and pixel unmixing exploring deep learning architectures
… robust method for Object- Based Image Analysis (OBIA). Subsequently, the research delves into the application of autoencoders for spectral dimensionality reduction, culminating in a comparative analysis demonstrating their efficacy in preserving crucial information for classification while …
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Automated Mapping of Lava: Classification of the Lava Flow Field from the 2021 Fagradalsfjall Eruption
… map lava channels; Object-Based Image Analysis (OBIA) was needed instead. Mean-shift segmentation on the 30 September data was performed with the open-source Orfeo toolbox. Zonal statistics were calculated for each segment. A Random Forest model was then trained using channels identified by …
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The application of machine learning and 3D photogrammetry for cold-water coral habitat classification in the NE Atlantic
… (CGC); Object-Based Image Classification (OBIA) and; Machine Learning Multiclass classification (MLMC). These first three workflows provided a binary (coral, seabed) classification with accuracy ranging 56 to 74% and provided the analysis of the percentage class distribution for each …
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Wetland landscape dynamics and its socio-ecological implications
… part employed an object-based image analysis (OBIA) approach for image classification performed in ENVI software. This approach involves segmentation and grouping imagery into objects to preserve the spatial, spectral, and temporal scale. Two classification algorithms support vector machine …