A study of building height and plot ratio restrictions in densifying cities using 3D spatial analysis technology: A case study of the City of Parramatta

Publication Type:
Conference Proceeding
Issue Date:
Full metadata record
As urban areas continue to grow globally they face enormous challenges in terms of land supply. The City of Parramatta has been identified as a major growth area for the Sydney Metropolitan area. With a current population forecast for 2016 of 236,272, the City is forecast to grow to 397,339 by 2036, a 68.17% increase over 20 years (Forecast.id, 2016). Over the past 50 years, the City of Parramatta has seen a 72% increase of hot days (over 35 oC), increasing from 7.4 days in 1967 to 12.7 days in 2015. Temperature impacts are therefore a significant planning factor that must be considered when evaluating future redevelopment proposals for the Parramatta CBD area. This study uses 3D GIS to simulate the impacts of various development densities on temperature and to demonstrate how the use of 3D technology can assist planners and developers in making better informed decisions. Three scenarios with different plot ratios and building heights were digitally simulated in the Parramatta Square mixed-use redevelopment area and compared to understand the urban heat implications of each scenario. Because the insolation factor (a measure of the solar radiation that reaches the earth's surface, measured by the amount of solar energy received per square centimetre per minute) can only be calculated using 3D models, this research offers an innovative approach to understanding how various redevelopment scenarios will impact the urban temperature of the area. Preliminary findings indicate that when the plot ratio and building height are increased, less ground area experiences long-hour sunlight exposure. Simultaneously, the percentage of the total area exposed to long-hour sunlight was decreased sharply. For urban areas experiencing severe heat and increased population growth, perhaps a re-evaluation of development patterns may help address some of the associated impacts.
Please use this identifier to cite or link to this item: