The model simulates the growth of an urban fabric, and of its main components: streets and buildings


Streets and buildings are the agents which generate the growth of the urban fabric. Streets play the key role. They grow from an initial seed and later generate buildings. Streets are made by a chain of elements which have a squared shape, and an heading. Each element is able to generate a new element, so that something like a chain is produced. The heading is the direction with which the new element is generated. The new element inherits the heading of the generating element, with a variation. The dimension of this variation as well as the frequency with which it happens are controlled by the two variables of the interface. In addition these elements may generate a cross. This means that the elements generates three new elements: the one in the same heading of the generating element, the other two with orthogonal headings, one in the right side, the other one in the left side. Each element of a street, unless it is a cross, generates two buildings one in the left and the other in the right side, of course in case the ground is not yet occupied.


Tu utilize the model click on the SETUP button and then click GO. The street layout can be controlled, also during the running of the model, by the two parameters. The first controls the variation of the heading of the new generated street element. The second controls the frequency with which it happens


You can try to generate very different streets layout by varying the two parameneter. When both are set to zero a squared grid is obtained. With the two at the maximum value a garden city-like layout is obtained. In the midle one can obtain a very different layoit. Try it. In addition you can try to generate a city that grows during the first steps with a squared grid and later as a garden city. Or the inverse. In this second case you can observe the interconnections between differently oriented squared grids that are merged in an only street layout.


Please, send comments to semboloniAT.unifi.it
Copyright 2008 Ferdinando Semboloni. All rights reserved.