We consider stationary Poisson line processes in the Euclidean plane and analyze properties of Voronoi tessellations induced by Poisson point processes on these lines. In particular, we describe and test an algorithm for the simulation of typical cells of this class of Cox–Voronoi tessellations. Using random testing, we validate our algorithm by comparing theoretical values of functionals of th...

The morphology of a city affects its ecological and socioeconomic functions, and thus how a city is spatially structured has important bearings on urban sustainability. The paper analyzes the spatial pattern of Beijing in relation to its urban functions. Our results show that the 6 concentric ring-roads in Beijing provide a basic framework for the city’s overall spatial pattern, andalso give it...

To Ludwig Streit on his 70 th birthday with warm wishes Abstract A complex web of roads, walkways and public transport systems can hide areas of geographical isolation very difficult to analyze. Random walks are used to spot the structural details of urban fabric.

This paper describes a system for generating virtual reality environments and, more specifically, three-dimensional geometric models of large-scale urban areas for driving instruction simulators. These models include roads, buildings, road signs and road markings. Such models also find application in other training simulators, virtual reality environments and games.

This paper presents the integration of 50 cm 4 band (R, G, B, and infrared) imagery with 80 cm LIDAR, and 2.5 meter posting IFSAR surface elevation models for urban scene analysis. The goal is to characterize urban scenes in terms of buildings, trees, roads, other geometrical structures, open areas, and various natural land covers. This type of information is useful for applications such as urb...

Road traffic noise affects a large number of people, especially in urban areas and is generally a major source of complaints. This paper refers to a study of the problem of traffic noise on roads which have been transformed into streets in the city of Erzurum. Noise levels are measured and the impacts suffered by the community are documented. Manual noise measurements were made along 12 streets...

The present paper studies simulation of traffic flow in urban environment, microscopic traffic flow simulation models of street’ crossroads are made. The behaviour of cellular automata (CA) models is analyzed by means of such as indexes queue lengths at crossroads with traffic signals, flow rates, average velocities on different roads. The following indicators characterize traffic situations in...

During rain, transient puddles form on roads, and this water is splashed into the air by moving vehicles. To determine whether this water contains Legionella pneumophila, we collected samples from roads. We found that L. pneumophila are abundant in these puddles, especially during warm weather.