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Optimization of GIS Information In Railways Networks by Integration of Global Positioning Systems (GPS) and Multimedia Systems
Data Collection for Railway GIS In the world Some countries like England and Japan have been using the integration of multimedia and GPS method for data collection in their railway. Omnicom System In England This system can make information of track and can be used to evaluate the failure of track by integration of film and GPS. this system can make a report of failure of track (Figure 3). A new and innovated track inspection system solves the problem of walking the track without risk on high speed lines under new safety roles and provides maintenance people with a configuration of data and images that is clear and accurate[6,9].  Figure3: Data Collection of England Railway Railway Video GIS System In Japan Integrated system of GPS and Multimedia can be used for data collection and maintenance of railway. This system can get the position of train and other information of railway, preparing the film of track and a report of nearest object, achieving the information like map and photograph are the abilities of this system [7]. Designing and Implementing System For Spatial and Attribute Data Acquisition (DGSRAIL) Because of successful experience in implementation of Gps and Multimedia integration to collect spatial and attribute data that are essential for Iran’s railway network, after primitive researches, recognition, analyzing and doing a pilot project, the system for collecting data of Iran railway was designed and tested in railway company for first time. having tables, maps, films ,pictures and text definition of each features are the capabilities of this system. It works in intranet of railway company and can integrate the GPS information with multimedia of rail track. In spite of the limitation in preparing hardwares, this system have a user friendly software, visual analyzing and editing of spatial and attribute information are the other capabilities of this system. Introduction of System In this system we used four digital cameras and GPS to integrate the information of GPS and film. Designed software can get the spatial information and join them to the film. In this system we match the time of GPS and film. After preparing the film of rail track, we get the information of railway objects (Spatial and attribute information) from film, By designed software. The recognition and analyzing of system that make railway information from multimedia have been done in three stages. The first and second stages have been done completely, but the third stage is incomplete. In the first stage an operational team has done evaluation of a pilot project to achieve a better recognition on main project. Analyzing the required time, cost and accuracy and the willingness of GIS in company are the aim that have been achieved in pilot project. In second step the hardware and software of system was developed .In recent system there is capability to observe the profile of track and the rate of kilometers that have been taken. In developed system we can see the film and table of spatial and attribute information of railway features at the same time. Collecting information of the track have been done by four digital cameras (three analog camera used in pilot project) [2] (figure4). In the third stage a user interface was designed and the information form of features were completed systematically, and spatial and attribute information of railway features were stored in a Geodatabase. The capability of producing the geometric information of track in the film is a goal of near future.  Figure4:Installation of digital camera on Derezin (trolley) DGSRAIL System Ability The most important capability of this system are: I)Collection of Spatial Information by GPS: For collecting spatial information from railway network by GPS, the program have been designed and Implemented that can get information from GPS continuously. this information will change to special format and finally was stored in a database. For navigating and displaying of data a digital map (1:25000,1:1000000) which have the information about roads, cities , province of Iran was used [3].  Figure5:Finding the coordinate of system by time II)Integration of the GPS Data and Multimedia: For integrating the spatial data of GPS and multimedia a program was designed. In this program the time of GPS and film are match together and the positioning of railway feature on the film have been done by the matching of film and GPS (figure5). III)Inputting The Attribute Information Of Features: In this system entering of data has been done automatically. The picture of the features has been prepared from the film and was stored in database (figure6). IV)A Place for Displaying Maps and Attribute Table (user interface): Because of the variety of application of GIS, different user interfaces have been developed that help to respond the problem. Therefore, a user interface has been designed for Railway GIS application. This system has ability to make dynamic report of the situation of railway feature and to show the spatial situation and attribute information of features and to get information from a database.(figure6)  Figure6:Data Input and introduction of feature type to DGSRAIL V)Ability to Join the System with AVI : Navigation of automatic vehicle need a map to be shown, therefore, this system need to have graphic maps which in that, train can be identified to conclude to some analysis the result of AVI/TAG system can be joined. List of some railway features that have been collected from 1596 kilometers of railway have been mentioned in Table 1. Stored information is about 700 GIGA Byte which have consisted of films, pictures and tables.  Table1:some layers which have been introduced to system |