Algorithm Implementation Of Public Transportation Accessibility Analysis With The Spatial Information Digitizing

Transportation accessibility is one of the most important filed in the Urban Plan research .It affect the roads plan, the land use, the population density and so on which were widely cared by the urban planner. Up to now, there are many achievements in this filed, but there are still some defects that is many research have not combined with the factual space very well, they abstract the real space excessively. So their achievements are too rough, and can not be use by the urban planner very well.And, as the development of big city, their traffic problems became more and more seriously. Compared public transportation with the private transportation, the public transportation have many advantages, just like they take less urban space, less oil, and can transport more passengers. So many city planner care more about an idea, that is'public transportation first'. And they have done many efforts on establishing an efficient public transportation system in urban planning. So it's very useful that to evaluating city public transportation accessibility in the use of fine urban planning.Along with the development of urban planning, it need more fine results to afford the strategic decision, just like the means of fine urban planning. In this paper, I promote a new way to evaluating the transportation accessibility based on the spatial information was well organized and the public transportation. And algorithm implementation three kinds of analysis of transportation accessibility, which is the analysis of connexity in several points, the analysis of one point and service area, the analysis of transportation accessibility of city or test area.