Explaining the model of urban pattern formation in informal settlements in Iran

Ignoring the poor social class in physical planning and urban housing causes the emergence and exacerbation of inequality and ultimately informal settlements. Recognition of informal settlement formation is so important to the extraction of patterns and types depending on the model evaluation. The methodology of research is descriptive-analytical, which has a development purpose. According to the nature of informal settlements in different views, criteria can be divided into social, economic, environmental, and economic branches but for the formation matter and its pattern, the environmental branch includes the physical dimension too. The collecting method is library resources and for evaluation, the Delphi method was applied. The result shows that it is possible to evaluate the localized indicators based on two environmental and physical components to evaluate the pattern of urban form in informal settlements. In general, there are two axes in the formation pattern of informal settlements in Iran. Proximity to the main transportation arteries due to the presence of land and lack of restrictions on housing construction and using topography to occupy land and create housing. With these two axes, it is possible to recognize the existing urban patterns by adding the structure of the access network to it and creating blocks and the type of granularity in it. According to the types of urban settlements, in future studies, the urban form of informal settlements can be classified according to the type of climate, topography, population, the use of urban spaces, etc., and presented in the proposed model for evaluation.