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 50 for “"Accuracy Assessment"”.
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Global Digital Elevation Model Accuracy Assessment in the Himalaya, Nepal
… to the GCP ground reference data to evaluate the accuracy of the satellitederived DEMs, and to determine the utility of elevation and derived slope and aspect for research such as vegetation analysis and erosion management. The SRTM and ASTER DEMs each have benefits and drawbacks for various uses …
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Code Verification and Numerical Accuracy Assessment for Finite Volume CFD Codes
… the correctness of the code through order of accuracy testing. The verification testing is performed on different mesh types which include triangular and quadrilateral elements in 2D and tetrahedral, prismatic, and hexahedral elements in 3D. The requirements of systematic mesh refinement are …
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Optical accuracy assessment of fully guided Yomi implant surgery in partially edentulous cases
… (CAIS). Previous studies have analyzed the accuracy of computer-assisted implant surgery through using both pre-operative and post-operative CBCT scans to compare deviations. This study introduces a new method of intraoral scanning to evaluate the accuracy of implant positioning. The …
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Aladdin's Magic Lamp: Developing Methods for Calibration and Geolocation Accuracy Assessment of the DMSP OLS
… a repeatable method for assessing geolocation accuracy, performing inter-calibration, and defining the minimum detectable brightness would be beneficial. An array of portable lights was designed and taken to multiple field sites known to have no other light sources. The lights were operated …
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Upper Missouri River Basin Aquatic GAP Fish Distribution Model Accuracy Assessment and White Sucker, Catostomus commersonii, Population Characteristics in the Upper Missouri River Basin
… further scientific investigations. The accuracy of fish distribution models used in the Gap Analysis Program of the United States Geological Survey was assessed by comparing observed fish assemblages in the six drainages to predicted fish assemblages. A number of accuracy metrics were …
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Land Cover of Virginia From Landsat Thematic Mapper Imagery
… homogeneous land cover areas were used in the accuracy assessment. The results of the overall accuracy for each scene determined the ordering of scenes within the statewide land cover mosaic (i.e., scenes with higher accuracy had a higher proportion of area represented). An accuracy assessment …
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On Methodology for Verification, Validation and Uncertainty Quantification in Power Electronic Converters Modeling
This thesis provides insight into quantitative accuracy assessment of the modeling and simulation of power electronic converters. Verification, Validation, and Uncertainty quantification (VVandUQ) provides a means to quantify the disagreement between computational simulation results and …
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A Comparison of Imperviousness Derived from a Detailed Land Cover Dataset (DLCD) versus the National Land Cover Dataset (NLCD) at Two Time Periods
To address accuracy concerns of the National Land Cover Dataset (NLCD), this case study compares impervious surface from the NLCD to a Detailed Land Cover Dataset (DLCD) for the Town of Blacksburg, Virginia over two time periods (2005/2006 and 2011) at spatial aggregation scales (fine to coarse) …
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An alternative testing methodology for TOW missile training systems
… current practices do not adequately prove system accuracy or system training value. Research emphasis is placed upon identifying those factors involved in assessing system accuracy currently being overlooked. The objective is that future government testing will address system accuracy and training …
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Pre- and Post-Disaster Remote Sensing with Drones for Supporting Disaster Management
… (a preparedness activity) and rapid damage assessment (a response activity). As such, the second study presents the first pre-disaster drone-based mapping mission over an urban area (downtown Victoria, British Columbia) approved by Transport Canada. The objective was to assess the quality of …
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Toward the detection of landscape features : clustering 3D points using spatial and thematic characteristics
… and adapted a 3D range image segmentation accuracy assessment technique. I also contributed new techniques for segmentation quality assessment including two area under the curve indices and the development of new segmentation surface plots. Experimental evaluations included comparisons of …
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The Utility of Total Lightning in Diagnosing Single-cell Thunderstorm Severity in the Central Appalachian Mountains Region
… any associated severe weather reports as an accuracy assessment. The overall performance of the algorithm among both categories was much poorer than in previous studies. While probability of detections (POD) of the 2σ algorithm were comparable to previous research, false alarm rates (FAR) …
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Least Cost Path Modeling Between Inka and Amazon Civilizations
… to the Inka Road network using the linear accuracy assessment method of Goodchild and Hunter (1997) and Güimil-Fariña and Parcero-Oubiña (2015). The findings suggest that the empirical estimation and caloric cost methods were the most accurate and performed similarly, both were more …
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Assessing ice storm damage to hardwood forest canopies using the Advanced Solid-State Array Spectroradiometer (ASAS) and Landsat TM imagery
… of 714nr in 3 damage classes produced an overall accuracy of 54%. The effectiveness of off-nadir ASAS imagery (+/-45°, +/-26° view angle) to differentiate levels of ice damage was evaluated. It was determined that the red edge features of normalized ASAS data were not significantly …
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Satellite-based assessment of invasive vegetation in Lake Chad Basin, West Africa
… classification was done on both of the images, accuracy assessment was conducted and statistics were generated respectively. The end result is a classified medium resolution LULC map of the LCB and a high resolution map of a subset area of the LCB with a well defined LULC category that we could …
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Development and Application of a MODIS Snowmelt Model for Northwestern Montana
… for years 2000-2005. We performed a detailed accuracy assessment of the snow-cover product in the mountainous terrain and poor weather conditions of the northern Rockies. The assessment utilized 6 SNOTEL sites and over 1000 ground based measurements spanning the 6 year period. The MODIS …
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Development and Application of a MODIS Snowmelt Model for Northwestern Montana
… for years 2000-2005. We performed a detailed accuracy assessment of the snow-cover product in the mountainous terrain and poor weather conditions of the northern Rockies. The assessment utilized 6 SNOTEL sites and over 1000 ground based measurements spanning the 6 year period. The MODIS …
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Geospatial Analysis of Informal Settlement Development in Cape Town
… shacks in the targeted informal settlements. An accuracy assessment was conducted to validate any subsequent analysis that was completed from classified imagery. The overall accuracies ranged between 88-96%. Thereafter, change detection analysis would be used to understand how each informal …
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Evaluation of Deformable Image Registration For Improved 4D Ct-Derived Ventilation For Image Guided Radiotherapy
… lungs during the respiratory cycle. The spatial accuracy of the displacement field directly impacts the ventilation images; higher spatial registration accuracy will result in less ventilation image artifacts and physiologic inaccuracies. Presently, a consistent methodology for spatial accuracy …
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