SPATIAL ACCESSIBILITY ANALYSIS FOR ROAD TRANSPORTATION

The dynamic interaction among transport, land use and environment should be determined that is highly on demand due to sustainability goals. The indicators for the interaction between land use and transportation is defined as accessibility, spatial distribution of events/activities and spatio-temporal transportation volume/distribution. However, the previously designed and used models investigate these separately. Hence, interaction could not be quantitatively assessed. The spatial information technologies together with modeling techniques could serve as glue and integrate them that could serve as an integrated digital platform for sustainability analyses. Within this study, remote sensing images and other spatial information sources (maps in various scales, land-use data, vehicle counting's, demographical information, population, meteorological information and air quality information etc.) are used for determining the interaction between transport, land-cover/land-use and environmental impacts beginning from 1970's to 2014. Accessibility and connectivity are the selected methods to explore the interaction. In order to conduct a detailed study, a pilot area was selected at the European side of Istanbul, involving Bakirkoy, Bahcelievler, Bagcilar, Gungoren, Esenler, Ktictlyekmece, Avcilar, Btiytikyekmece districts, where these districts are the cross-road of many national and international highways and the airport and the rate of urbanization is very high. The interaction of transport, land-use and environmental impacts are changing within time and this mainly depends upon spatial information. The study captures the temporal and spatial change in accessibility, where the accessibility values for total distance in both modes, cumulative-opportunity in both modes, potential and daily accessibility indices increased by 80.49% and 99.07% respectively for the period of 2007-2014.