GIS
Noalden Misagh; Farsam Misagh; Adel Mardaneh; Saeid Madadi
Abstract
Urban sprawl or uncontrolled dispersion of built-up areas imposes many economic, social, and environmental issues to cities with a high growth rate. The combination of Remote Sensing and GIS. Technologies with the Shannon Entropy Model can used to identify, quantify and analyze the trends of urban sprawl ...
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Urban sprawl or uncontrolled dispersion of built-up areas imposes many economic, social, and environmental issues to cities with a high growth rate. The combination of Remote Sensing and GIS. Technologies with the Shannon Entropy Model can used to identify, quantify and analyze the trends of urban sprawl patterns. In this research, Landsat satellite imagery, spatial analysis of GIS and Shannon entropy used in two levels (for the whole city and within urban areas) in Tabriz city. After geometric and radiometric correction of images and the mapping of urban and non-urban areas in four periods from 1972 to 2013, to calculate the total entropy of each period, the region divided into 58 cells. In addition, to create a spatial pattern map and visualize urban sprawl, the whole city divided into 100 cells with 16 sub-cells, the amount of entropy of 16 cells was calculated, and sprawl spatial pattern obtained by Kriging interpolation method. The results of this study showed that urban sprawl of Tabriz has been approaching the maximum entropy (4.06) from 1972 to 2013 and has caused a two-fold gap between the growth of urban areas and the population. In addition, the spatial pattern of urban sprawl is unbalanced and focuses on the city’s communication axes.
Saeed Amanpour; Somayeh Gholami; Farahnaz Ghafarzadeh
Volume 6, Issue 11 , May 2015, , Pages 9-24
Abstract
One of the essential functions in geografialy urban studies by using of spatial and temporal data is urban growth analysis. In this context, urban horizontal expansion can be measured by statistical indicator. The main objective of this article is monitoring of growth of 9 urban areas, quantifying the ...
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One of the essential functions in geografialy urban studies by using of spatial and temporal data is urban growth analysis. In this context, urban horizontal expansion can be measured by statistical indicator. The main objective of this article is monitoring of growth of 9 urban areas, quantifying the degree of urban free growth, the degree of uncontrolled urban expansion, and the benefits of urban growth for a period of years 85-91, in the Shiraz city. To achieve this goal, the K-Score Pearson test is used for measuring the degree of city expansion, and Shannon Entropy is used for the degree of city sprawl, and finally the degree of urban growth was surveyed. These dimensions were measured for both the period of 85-91 and 9areas of Shiraz. Results show that the degree of freedom for a period of time is high. In the period of 88-89 observed growth of construction was less than expected. In area 1 the observed growth is equal to the expected growth. By considering the whole city, the general Shannon Entropy also shows concentration. In the end, the analysis of city benefits indicates that Shiraz has experienced a favorable positive city growth in all regions.
