investigation and analysis of the effective factors on the spread of apartment in khoramabad with use of ahp& topsis technics

at recent year improvement towns of country are considered for reason much accumulation, increase price of field, decrease dimension family and security cheap dwelling, natural structure khorramabad, economical changes accompanied by natural improvement population and change family from spread to nuclear increased necessity to dwelling and finally consider to vertical improvement. the method this writing is analyzing and quantitative in the three stages of library studies, field research, and finally data analysis by using ahp and topsis models have been developed. result show that at between effective factors at construction apartment units at khorram abad, environmental factor is the most effective. khoramabad has different topography and at town we see low and ups and geographical factors. important limitations of physical improvement at this town are rocks height present hills. at east bound of this town and at shariati street existence height cliff and these has sharp grade. at east south rock topography ghaziabad are seen. northern khoramabad has limitation at khorram abad –aleshtar at this area agricultural fields of villages are outspread at west area existence agricultural field and encounter with heights. at inside town and at west area, heights are most important limitation at physical improvement and at this area, residents spread on hills and heights. at west southern cemetery is other physical improvement limitation and gardens are spread. in the final classification using hybrid models can be achieved this result, natural and social factors - the economy and the parallel combination of the spread of urbanization have been effective in khoramabad.