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 17 of 17 for “"urban canyon"”.
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The evaluation and modification of a prediction model for road surface temperatures
… nights under all weather conditions at rural, suburban, and urban sites. The Partial Differential Equation approach gives encouraging results with average errors being close to -0.5°C and worse case errors of +/- 1.0°C. The Willmott 'D' statistic generally remains greater than 0.8 for each site …
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Improving High Sensitivity GNSS Receiver Performance in Multipath Environments for Vehicular Applications
… suitable for use in vehicular applications in urban canyon scenarios. Specifically, GNSS signals are affected by the surrounding objects, such as high buildings, trees, etc., which will introduce multipath errors. Multipath arises from the reception of reflected or diffracted signals in …
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Daylight and planning in Europe
This work addresses issues related to daylight in urban canyons in predominantly sunny climates. Reflected sunlight from obstructions and ground is a major contribution to the illumination of buildings in orientations and at times when the sun is behind the building. Physical measurements collected …
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Vehicle egomotion estimation using computer vision
… useful when flying in an environment such as an urban canyon, where features remain in the fields of view for a very short period of time.
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Art Center
… the artists would find their way out of the urban canyon to the sky of imagination. They would also be able to live lightly above the bustling world of reality.
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Modeling Outdoor Air Pollution and the Urban Form
… pollutant dispersion modeling within dense urban environments such as urban canyons. An open-source platform such as OpenFOAM is valuable as it can be fully customized for the varying intricacies of urban airflow and is accessible to a wide audience. This thesis develops a solver for aerial …
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Four-constellation GNSS Reliability and the Estimation of Inter-system Time-offsets for Improved Performance in Challenging Signal Environments
… GLONASS, BeiDou and Galileo constellations in urban environments. Furthermore, this study assesses the benefits of using a priori inter-system clock-offset information. The positioning performance of multiple GNSS constellations has been examined through covariance simulation and with live …
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Urban scale phenomena and boundary layer processes in mountain valleys
The urban climate of the city of Trento, adopted as a representative case study of urban weather and climate phenomena in a mid-sized city lying in a mountain valley, is investigated using different methods and on different spatial scales. First the intensity of the Urban Heat Island (UHI) is …
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Role of pavements in urban energetics
The Urban Heat Island (UHI) is a sustained increase in temperature in urban areas as compared to adjacent rural areas. This effect is partially due to the replacement of vegetated surfaces with lower-albedo impervious surfaces (primarily made of asphalt and concrete) to make way for urban …
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An urban weather generator coupling a building simulation program with an urban canopy model
The increase in air temperature observed in urban environments compared to the undeveloped rural surroundings, known as the Urban Heat Island (UHI) effect, is being intensely studied, due to its adverse environmental and economic impacts. Some of the causes of the UHI effect are related to the …
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Urban weather generator user interface development : towards a usable tool for integrating urban heat island effect within urban design process
Urban Weather Generator (UWG) is the urban design simulation tool that provides climate-specific advice for cityscape geometry and land use to assist the development of energy-efficient cities that are also thermally comfortable. The software enables urban designers to parametrically test built …
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Collision Avoidance and Navigation of UAS Using Vision-Based Proportional Navigation
… a small-scale UAV model flying through a virtual urban environment, which utilizes camera-in-the-loop simulation techniques.</p> <p>The final results of these studies showed that the most effective approach was to implement a cost function-based avoidance law that includes a term based on the …
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Floor Plan Based Indoor Vision Navigation Using Smart Device
… degradation in challenging scenarios such as urban canyon and indoor. Due to the overwhelming signal noise, building reflection and blockage, indoor navigation using GPS frequently encounters poor accuracy or even signal outage. In order to improve the service availability and navigation …
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Air pollution modelling over complex topography
… over complex terrain has been extended to the urban context, adopting, basically, the same conceptual tools on a smaller scale. A finite volume three-dimensional numerical model has been developed and tested in simulating dispersion of traffic derived pollutants in the town of Trento. For …
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On the Energy Sustainability of Active and Passive Building Integrated Technologies in the Context of a Changing Climate for Tropical Coastal Cities
… further increases the temperature of the urban canyon with feedback on human comfort and energy demands. Although there has been prior work reported on mitigating energy demands due to rising temperatures, these studies are focused mostly on the building scale, where the two-way …
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GIS and Satellite Visibility: Viewsheds from Space
… GPS signals, a major issue in mountainous and urban areas. This paper describes a new Geographic Information Systems (GIS) tool, a customization of ArcGIS named Satellite Viewsheds, which predicts satellite visibility for any place and time while considering line of sight obstructions. …
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Dependence of outdoor thermal comfort on street design in hot and dry climate
… readily interpretable from the perspective of urban designers. Street geometries are investigated, including various aspect ratios, i.e. height-to-width ratio H/W, solar orientations and a number of design details. First, symmetrical urban canyons with H/W equal to 0.5, 1, 2 and 4 and for …