Authors: E Zahran, L Bennett, M Smith Published: 25 Jul 2011


Air pollution dispersion models require the geospatial data of modelled road network centrelines, in order to model the spatial dispersion of traffic air pollution emissions. This data represents the geographical coordinates of the centreline vertices of the road network in the air pollution model application area. The manual collection of this data is labour-intensive and prone to human error particularly in the case of dense road networks. Some well-developed air pollution models allow the digitisation of modelled road network centrelines on a digital map. However, this proved to be a laborious process due to the large number of roads, the constraints of air pollution models on distance between consecutive road centreline vertices, and the digitisation limitations of the link between these models and GIS systems. Using a specific area with a dense road network in the UK city of Nottingham as a case study, research has been undertaken to develop, and implement by computer programming, computer algorithms to automate the collection and processing of geospatial road network data without any digitisation. This also introduced quantitatively the concept of ‘Level of Details’ (LOD) of modelled road networks to the science of air pollution dispersion modelling.
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