The network map is digitized. Digitization is done manually using On-screen method. The errors in the original maps will be transferred and they are likely magnified when digitized using GIS. Here arcs and nodes are defined by the user. The advantage here is the ease in the ability to spot the digitizing errors. Post digitizing process generally includes building topology and cleaning the coverage. Finally the errors are corrected for each of the GIS layers.
Tic points are to be digitized for calculating the accuracy and for performing projection. The control points are collected using the GPS from well identified, prominent locations such as road junctions which are distinctly visible on the map. Co-ordinates for control points are collected in more than 4 points which is the minimum requisite to increase the validity of the data. The tics can also be used for transforming the coverage to the required projection so that real world co-ordinates are obtained for our analysis. The projection used here is polyconic which is considered the best suited for India. Arc View and Arc Info are the softwares used for digitization, transformation/projection and analysis.
Analysis:
After the data collection, the next step is the analysis. The co-ordinates of the bus stops are known using which their po
