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 49 for “"Positional accuracy"”.
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Elevation Effects on GPS Positional Accuracy
… map-grade receiver were evaluated to assess the accuracy of differentially corrected points. Many studies have focused on the accuracy of GPS units under ideal data collection conditions. Ideal conditions allow the collection of data with four satellites (3D mode), yet field data conditions are …
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Positional accuracy of the Wide Area Augmentation System
… correction have a published horizontal accuracy of approximately 10 to 15 meters (average error). An attractive option for differential correction for these GPS units is the Wide Area Augmentation System (WAAS). Most consumer-grade GPS units on the market are WAAS capable. According to …
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On-Site Synthesis of Halide Perovskite Nanocrystals with Sub-50 nm Positional Accuracy
… growth of perovskite nanocrystals with high positional accuracy must be achieved. In this thesis, we demonstrate a method for growing sub-50 nm halide perovskite nanocrystals with sub-50 nm positional accuracy. We first explore how local forces can be engineered to control particle …
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Positional accuracy in a natural resource database: comparison of a single-photo resection versus affine registration
Positional and area accuracies were calculated for digitized data taken from 1:20,000 scale aerial photographs and United States Geological Survey (USGS) 1:24,000 scale topographic maps. Positional accuracy was determined as the Euclidian distance between the digitized coordinate and the reference …
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A simulation of the single scan accuracy of a two-dimensional pulsed surveillance radar
… considers the single-scan two-dimensional positional accuracy of a pulsed surveillance radar. The theoretical aspects to the positional accuracy are considered and a generalized analytical approach is presented. Practical position estimators are often complex, and theoretical predictions of …
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Development of an Autonomous Unmanned Aerial Vehicle for Aerobiological Sampling
… the range of aerobiological sampling, improve positional accuracy of sampling paths, and enable coordinated flight with multiple aircraft at different altitudes. We equipped a Senior Telemaster model airplane with two spore-sampling devices and a MicroPilot autonomous system, and we conducted …
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UNMANNED AERIAL SYSTEMS (UAS) IMAGE PREPROCESSING TO REDUCE ARTIFACTS AND IMPROVE GEOMETRIC REGISTRATION WHEN GENERATING ORTHOPHOTO MOSAICS AND 3D MODELS
… erroneous output in the form of artifacts or positional errors caused by homogeneous areas, light reflections, object movement between photos, or sub-optimal algorithms. The goal of this research was to develop preprocessing algorithms that would filter movement (or other time or …
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Assessing the accuracy of openstreetmap data in south africa for the purpose of integrating it with authoritative data
… data. The internal quality elements included the positional accuracy, geometric accuracy, semantic accuracy and the completeness. The _rst part of the qualitative assessment was concerned with the currency of OSM data between 2006 and 2012. The second part of the assessment was focused on the …
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Get To The “Point”: Improving Location Services in Tippah County Mississippi
… to be used in Mississippi, [2] determine how positional accuracy changes between urban and rural areas, and [3] determine spatial variations in aerial imagery. Address data model comparisons were conducted using match rates between street, parcel, and point address models. Positional accuracy …
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Canopy, terrain, and distance effects on Global Positioning System position accuracy
… of consecutive position fixes, and PDOP on accuracy were evaluated. Position accuracies were determined for a total of 27 sites: three replicate sites selected for each of nine distinct conditions: three canopy (deciduous, coniferous, open) and three terrain (ridge, slope, valley) in all …
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Defining agricultural land use in Rondonia, Brazil by examination of spot multispectral data
… of consecutive position fixes, and PDOP on accuracy were evaluated. Position accuracies were determined for a total of 27 sites: three replicate sites selected for each of nine distinct conditions: three canopy (deciduous, coniferous, open) and three terrain (ridge, slope, valley) in all …
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Visual hulls for volume estimation : a fast marching cubes based approach
… comers characteristic of voxel based models. The positional accuracy of each surface patch is improved through the implementation of a binary search applied to all patch vertices.
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Design and development of a positioning robot for use as a surgical debridement method
… healing process. This thesis investigates the positional accuracy of a positioning robot for future development as a hydro-surgical debridement robot that runs autonomously. After completion and assembly of the mechanical structure of the robot, two different infrared sensors, the VCNL4000 …
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A variable compliance controller for cooperative vision guided robotic assembly
… with visual feedback is developed to improve the positional accuracy of the robots impedance controllers and boost the reliability and performance of the entire system. Finally, a unique design process is developed to obtain the optimum variable compliance controller control law equations with …
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Design and implementation of a pair of robot arms with bilateral teleoperation
… be automated by robots with high speed and high positional accuracy. However, these robots typically cannot perform tasks that require perception or disturbance rejection. Humans are still needed in factories due to their innate ability to understand situations and react accordingly. Teleoperated …
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Effective and Efficient Non-Destructive Testing of Large and Complex Shaped Aircraft Structures
… work has resulted in 1. The demonstration that positional accuracy when ultrasonic testing has a significant effect on defect detection and a method to measure positional accuracy by evaluating the compensation required in a ten axis scanning system has revealed limitsio the achievable defect …
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Habitat Suitability and Availability for Rainbow Trout (Oncorhynchus mykiss) in the Canyon Reservoir Tailrace and Evaluation of Side Scan Sonar for Habitat Mapping in a Semi-Wadable River
… related to water level, access, navigability, positional accuracy, and post-processing were overcome. Trial runs, training, map accuracy assessments, and technological development will improve the effectiveness of this technique.
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Electrohydrodynamic jet printing: droplet to shape writing, and potential applications with 172nm exposure
… the deposition of 500nm-30um droplets with high positional accuracy. The University of Illinois at Urbana-Champaign, UIUC, has developed this technique and shown it has many capabilities. Whether the goal is to pattern biologically active chemicals, draw an etch mask, connect complex geometry …
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Development of kinematic coupling preload guidelines through design and testing of an adjustable micromanufacturing fixture
… <1.5 [mu]rad 2[sigma] (95% confidence) static positional repeatability over 1000 separation-engagement cycles and equivalent 2[sigma] (95% confidence) path-following accuracy when used as a dynamic nano-stage. The HPF has also demonstrated adequate stiffness to ensure <50 nm positional accuracy …
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Optimized Thruster Allocation Utilizing Dual Quaternions for the Asteroid Sample Return Mission (OSIRIS-REx)
<p>As spacecraft require higher positional accuracy from the attitude control systems, new algorithm developments, along with sensor and actuator resolution and range improvements are necessary to achieve the desired science accuracies. For agile 6-Degrees of freedom (6-DOF) spacecraft with …
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