Sustainability may be viewed as a principled form of conduct. Among its effects is a growing emphasis on civil society and local governance through which the members of communities are encouraged to rethink democratic ideas and practices, and reconfigure how to live. Although normative,...

Out-of-home activities are engaged within time - space prisms, but the prisms themselves are unobservable. In this paper, stochastic frontier models with observed departure and arrival times as dependent variables are formulated to locate time - space prism vertices. Two possible distributions...

This paper presents a conceptual framework to formalize an individual-based and spatially explicit model of the epidemiology of infectious diseases. The framework differs from that of the traditional population-based epidemiological models in terms of assumptions, conceptual models, and model...

Networks are structures that pervade many natural and manmade phenomena. Recent findings have characterized many networks as not random chaotic structures but as efficient complex formations. Current research has examined complex networks as largely a nonspatial phenomenon. Location, distance,...

A growing trend towards high-density urban living increases the significance of natural features within the urban fabric. In high-rise living the view is one means of continuing contact with the environment. Using visualizations, public survey techniques, and a geographic information system...

Declining water quality in the Chesapeake Bay estuary is in part the result of disruptions in the hydrological system caused by urban and suburban development throughout its 167 000 km² watershed. A modeling system that could provide regional assessments of future development and explore the...

Some questions about space syntax -- a well-known technique of urban analysis developed over the past decades by Bill Hillier et al -- were raised by Ratti in this journal. Hillier and Penn produced a detailed rejoinder, rebutting most of the criticisms and restating the assumptions made by the...