evaluation of green space changes with respect to landscape index and remote sensing in capital city of karaj

urbanization and population growth along with an increase in the environmental pollution resulting from human activities which have dramatically changed the green space and land cover have been key factors in the sustainable development of land and the management of land use. to collect reliable data required for providing land cover maps as well as for investigating the environment, remote sensing have been a useful method. the aim of the present study is to investigate any changes in green space in the capital city of karaj in the years 1956, 1989 and 2011 using remote sensing techniques including aerial photographs and satellite images such as irs-p5 and irs-p6. for this purpose, satellite images were geometrically amended and then categorized by minimum distance. the pattern of the green space distribution was studied by selecting landscape indications including ca, pland, pd, lsi, and shape-mn. in addition, according to the results, amount of green space per person, itself, had a decrease from 558 m2 in 1956 to 25 m2 in 2011. comparing these green areas in the eleven regions in karaj also shows a lack of equal distribution of green spaces in these regions and consequently in the city while the fifth, eighth and ninth regions now have the least amount of green space.