Abstract
Rapid urbanization and urban growth are complex problems in countries, such as Iran. The major goal of current research is to determine the spatial-temporal pattern of urban growth in Tehran megapole. This research can provide a background for more informed planning. Current research used historical maps and satellite images to determine the urban growth patterns for Tehran megapole for the time period 1921–2011. Spatial metrics were used to analyze the spatial-temporal pattern of urban growth at two levels: Tehran’s Megapole as whole and within the concentric zones in this Megapole. Results show that urban growth rate in Tehran megapole area can be divided into three major periods: (1) rapid growth rate (1921–1976), (2) very rapid growth rate (1976–1986), (3) slow and consistent growth rate (1986–2011). Results also show that urban growth in Tehran city follow tidal waves pattern and consequent phases of growth. These tidal waves are moving toward external edges of Tehran city. This research was an attempt to apply a remote sensing methodology for urban planning purposes. Also, it was an attempt to determine the pattern of urban growth in Tehran megapole which was not determined before.
Highlights
Since industrial revolution at the end of 18th century, world urban population has increased exponentially with rapid speed
The major goal of this study is to show the spatial-temporal changes of Tehran’s growth between 1921–2011, using spatial metrics
Current study looked at the spatial- temporal patterns of urban growth in Tehran city at two levels
Summary
Since industrial revolution at the end of 18th century, world urban population has increased exponentially with rapid speed. In 1830, urban population was about are 1 billion and it increased to 7 billion in 2011. Urban population increased from 14 percent in 1900 to 50.5 percent in 2010. It is predicted that by 2030, more than 60 percent of population are urban resident (Wu et al, 2010). United Nation has estimated that urban population in developing countries will increase from 2.048 billion in 2000 to 3.991 in 2030. It is expected that urban population in developed world increase from 870 million to 1.01 billion (Wu, 2008). The proportion of urban residents and urbanization are different between developing and developed world, the increase in urban population growth is a global trend
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