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Presenting urban development model by using environmental models &GIS & RS, North-West of Tehran
Summary and Conclusions:
District22 in the northwestern of Tehran with an area of about 10000 hectare is located at the West part of Tehran and is restricted by Alborz mountain chain in the North , Kan River in the East , Tehran-Karaj freeway in the South and short mountains of Karevansarasangi in the west. The foot heels of Alborz mountains chain, proper topographic situation, forest park of Chitgar , three major valley rivers which all are located in this part of metropolitan city of Tehran , provides a unique environmental sightseeing . The existing urban construction have occupied less than 15% of this area . Three major east to west highways and two highways from the north to the south and three major south to north highways together with Tehran - karaj subway has provided a proper network to connect this area to other parts of the capital. Based on drawings from GIS analysis there is no doubt that natural and ecological capacities of Tehran district22 of proper place for construction, recreation, tourism and cultural purposes. The existence of the natural gardens and recreation centers and also considering the results from RS analysis shows that urban development plans in the field of trading , administrative and industrial operation have limited the capacities in that area . Attached maps in this paper the importance of environmental models for urban development. The maps of environment pollution control have been provided by using GIS and models and GIS which are presented in the model and this is in addition to determination of natural potentials of the district which its related maps have also presented. On the other hand, using advanced systems for identification, organizing and planning in development projects such as GIS systems seem to be of great importance at present and future . In this paper modeling for urban development and applying efficient systems of GIS for this purpose are jointly presented . Using models of determination of ecological capabilities and methods of determination for ecological and social capacities as well as environmental conditions of the city and applying standards at final in making urban development models while using GIS for assessment, planning and urban development management are of achievements of this paper .Also emphasize on identification of the background of the land and urban changes term through RS systems is recommended as the most suitable method in urban studies and development plans . 
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