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Title:
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PREDICTION OF VENTILATION PATHS IN URBAN ENVIRONMENTS USING DIGITIZED MAP |
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Author(s):
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Julia Åhlén , Stefan Seipel |
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ISBN:
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978-972-8924-97-3 |
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Editors:
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Hans Weghorn and Pedro Isaías |
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Year:
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2009 |
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Edition:
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V II, 2 |
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Keywords:
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Urban, image, parameter, vectors |
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Type:
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Short Paper |
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First Page:
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217 |
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Last Page:
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221 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Urban populations and the density of settlements constantly become higher. This leads to higher energy consumption and
generally to deterioration of life comfort. Study of urban heat and cool islands is of great importance for social
community planners and building engineers. Ventilation paths are defined by turbulent mass, momentum and energy
transport conditions and can thus be modeled. This area is usually studied by measurements of the conditions and air
flows in laboratory environments. This paper presents a method for the prediction of free ventilation paths in a small city
using digital imagery. A digitized map created from a geographic data base is used as input. Image analysis is performed
in order to create an optimal edge image. A modified Hough transform is applied. Points of interest are defined and
surroundings are calculated. These points are inputs to a parameter space. As a result a free wind passage is predicted
based on the position of the observer. Prediction is done by calculation of possible straight lines in a parameter space.
Finally, the method is verified by comparison with position vectors from the same space in the image and the best fitted
path is chosen. |
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