From Chaehyun

Revision as of 14:22, 25 January 2010

Korea Subway Positioning System

Overview

This is my experimental result about subway positioning system. In Korea, some local governments construct bus positioning system and provide real time bus positions to public. It is really useful when you wait a bus in a bus station.

Seoul Bus Information System

Gyungi Bus Information System

However, subway is a different story. I am pretty sure that a subway operator has a system which estimates where each subway is, because it shows when the next station arrives in a station inside.

But it does not provide any OpenAPI system so that a 3rd party developers can make a useful application with real time positions of subway.

Therefore, I try to estimate a real time position of each subway. The idea is simple. Subways in Korea arrive at and depart from a station in time exactly in most cases. Using this time table and position of each station, we can estimate the position of subways in that time. Here are my progresses.

Progress

2009. 11. 15

• The time tables of all stations are crawled through the subway operator’s website.
• http://www.seoulmetro.co.kr/station/trainschedule.action?stationId=0226&mainLine=2

• Positions of each station are gathered by Yahoo Korea’s openapi.
• http://kr.open.gugi.yahoo.com/

2009. 11. 16

• Display the real time positions of subways in line #2 using Google Map API.
• http://www.youtube.com/watch?v=P7IfE46lyiM

• Detailed time tables of each trains are crawled through the subway operator’s website.
• http://www.seoulmetro.co.kr/station/stationtrainschedule.action?eng=&stTrainNo=2030&mainLine=2&inoutTag=1&weekTag=1&stationId=0226

2009. 11. 25

• Positions of junction stations which have more than one position are corrected by refineStationInfo.php (currently, the update behavior is blocked).

2009. 12. 02

• Smart UI is appended.

* You can choose each line number which you want to check the current positions. 
* Remain time (sec) of a train which stops at a station is displayed.

1. . The position of subway is estimated using current time, time table of trains, and a position of a station.

Here is a demonstration video which shows you a brief concept of this system.

To do list)

Incorrect path information of a train

sql information is provided...

Progress

2009. 11. 15

* 프로젝트 시작

2009. 11. 16

* http://www.seoulmetro.co.kr/station/trainschedule.action?stationId=0226&mainLine=2 
* 지하철 시간표 crawling
* 역정보 crawling
* Yahoo API  http://kr.open.gugi.yahoo.com/document/poisearch.php 를 사용하여, 역의 위치 정보 수집

2009. 11. 17