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Bus stop rationalisation using GIS
Overlaying Technique Overlaying Technique is one in which each layers containing separate themes and all or any of the layers can be super-imposed on one another as the case may be and can be analysed. All kind of operations like union, intersection, merging etc., can be made use of for analysis purpose. Methodology The following flow chart gives a brief description of the methodology carried out in the study. 
Collection of Data All the data required for the study namely the name of the bus-stops, location, passenger density of the bus-stops, the land use details in and around the bus-stops, the inter bus stop distance were taken as secondary data from the mini-project done by the Under Graduate students (BE Civil) of Anna University. Land use Pattern: Land-use is a function of transport and vice versa. Since both are mutually dependent on one another, it is important to study how the land use developments influence the trip or traffic generation characteristics along the study route. As such, the general land use distribution and the concentration of activity centers at a distance of 750 meters from the road along the selected route have been taken into consideration. Passenger Density: It corresponds to the number of passengers boarding and alighting at each bus stop along the selected route for a duration of one hour. Inter-Bus Stop Distance: The distance between two consecutive bus stops is one of factors that has to be taken into consideration for rationalization of bus stops. The maximum preferable distance of travel by man by walk is around 500m. Hence the existing bus stops has to checked whether their inter-bus stop distance is such that people can reach them with ease. The inter-bus stop distance cannot be too large or too small. Accessibility of the passengers: This refers to the accessible distance of the bus stops for the passengers, it also refers to the location of primary residential or mixed residential places from the bus stops because these type of places are the one which fetches more passengers for the bus stops. Steps in ARC view The steps involved in Arc View (GIS) for querying and conducting analysis is listed below,
The map for the area chosen for the study, here, the Saidapet - Thiruvanmiyur stretch is obtained from the concerned authority. The map is then scanned and the scanned map is copied into the computer for digitizing purpose. Digitizing: The scanned map is digitized with the help of the Arc View software. The complete stretch of the Saidapet - Thiruvanmiyur route is digitized carefully along with important intersections and some of the land mark features in the map. Creating different Themes: After digitizing the study area, different themes like 'bus stops' (point theme), 'institutional', 'commercial', 'mixed residential' land uses (all polygon theme) and 'buffer' (polygon theme) are created and the corresponding land uses were digitized from the land use data obtained from the CMDA and by ground inspection. The 'bus stops' theme is created to indicate the location of the bus stops in the study area. The 'land use' themes are created to represent the type of land uses in and around the bus stops. The buffer theme is created with multiple buffers around the bus stops, in this case three buffers have been created with a radius of 200m, 400m and 600m taking the bus stop as the center. |