Brent D. Ryan first visited Detroit in 1993. Describing this experience, he says: ‘‘The sense of emptiness was overpowering. ... I felt as if I was walking into the ruin of America.’’ In his book ‘‘Design after decline—how America rebuilds shrinking cities,’’ Ryan tries to understand why so many American cities have been losing population, what was and is done to change the fortune of these cit...

Rapid urbanization has caused numerous problems, and the urban spatial structure has been a hot topic in sustainable development management. Urban spatial structure is affected by a series of factors. Thus, the research model should synthetically consider the spatial and non-spatial relationship of every element. Here, we propose an extended Voronoi diagram for exploring the urban land spatial ...

the first experimental sam for iran was constructed more than three decades ago under the supervision of prof. pyatt. based on this work prof pyatt had observed that the way in which iran was spending oil revenues was likely to exacerbate urban—rural income differentials in iran. in his approach to sam he did not distinguish between factorial and institutional income distributions preferring to...

A data structure based on urban blocks which vastly improves rendering speed in urban walkthroughs and flights is presented in this paper. The city is split by means of a special quadtree partition and the block is adopted as the basic urban unit. One advantage of blocks is that they can be easily identified in any urban environment, regardless of the origins and structure of the entry data. Re...