Figure 7. Three plot transition models show plot characteristics change in two aspects: land use and plot size.
In the second mode of plot transformation the land use is changed while the plot size and shape remain almost the same. The project of Nanjing Cultural and Art Centre (NCAC) during 1965-2000 is an example (model 2 in Fig. 7). In 1965, a four storey factory of Nanjing Machinery Plant was built on the site designated for industrial land use. In the 1990s, the land use of such plots was transformed from industrial to public and exhibition. Subsequently, the six storey NCAC project was built in 1999 and has been used up to now. In this mode of plot transformation, there is no change on the plot shape, but the change of land use may cause a series of changes to plot access location and building arrangement. In the third mode of plot transformation both the land use and plot size are changed. The project of International Financial Centre of China Merchants Group (IFC) from 1996 could be taken as an example (model 3 in Fig. 7). Before 1991, a series of land use units occupied the site of IFC, such as a fuel company, traditional folk houses and multi-storey residence. From 1996 to 2008, the project of IFC acquired its site by land auction, and seven storey podium buildings, 28 storey auxiliary tower and 56 storey main tower were constructed successively. The emergence of new plot lead to a new access position for the plot, and also caused boundary changes with adjacent plots. The different plot transformation modes resulted in differences in the aspects of plot size and plot shape as well as the distinct morphological characteristic of plot. Statistics study on the morphological transformation in XinJieKou district The transformation of street structure and plot pattern in XinJieKou district eventually produced 53 plots with significant morphological differences (Fig. 8). The previous historic-geographical analysis of plot usage, plot size, plot shape and plot boundary condition are the important aspects of discrepancies in plot characteristics. The statistics on branch road numbers and plot numbers in the transformation process in XinJieKou district show that the process of plot development accompanied the maturation of the urban street system (Fig. 9). From 1940s to 1990s, with the concentration of urban infrastructure, the plots experienced the period of fiercest change. Up to 2010, with the stabilisation of the urban street system, the plots have gradually stabilised. This indicates that the morphological characteristics of plot were closely influenced by the morphological characteristics of street.
Urban Form at the Edge: Proceedings of ISUF 2013, Volume 2
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