We describe the algorithms we have developed to automatically generate street networks and building plots in the automatic procedural creation of a realistic city. Our system first sites the important regions of a city, such as the commercial center, historical center, and residential areas. Then, a network of freeway and main roads are built. Finally, a network of streets are built throughout ...

Walking rates to school remain low for U.S. children in large part due to parent concern for child safety. Little research has investigated the specific features of streets and intersection networks that parents associate with safe walking networks for children. To investigate which aspects of the child walking environment lead to parental concern, parent volunteers conducted an audit of street...

We propose a novel approach to selection of important streets from a network, based on the technique of a self-organizing map (SOM), an artificial neural network algorithm for data clustering and visualization. Using the SOM training process, the approach derives a set of neurons by considering multiple attributes including topological, geometric and semantic properties of streets. The set of n...

This paper proposes a novel generalisation model for selecting characteristic streets in an urban street network. This model retains the central structure of a street network, it relies on a structural representation of a street network using graph principles where vertices represent named streets and links represent street intersections. Based on this representation, so-called connectivity gra...

The purpose of this work is to compare propagation models for small urban cells in GSM 900 and 1 800, with the aim of testing their behaviour. With this objective in mind, a measurement campaign in co-operation with the Portuguese GSM operator Telecel was carried out in two distinct areas of Lisbon: Arco Cego, characterised by narrow streets with low buildings, and Avenidas Novas, with large st...

one of the most important issues in today&rsquos; urban world is increasing use of cars and its noise pollution, which is now one of the most important affecting pollutants on health and quality of lives of residents in urban areas. noise pollution effects on various aspects of human and the community health as well as the high cost of treatment, thus more studies in this field is needed. hence...