Study On The Traffic And Traveler Information Services Platform And The Key Technologies Application

Along with the development of economy and the exaltation of urbanization level, the traffic problem is also gradually serious. People hope earnestly to obtain Traffic&Travel Information (TTI) and this urges the booming development of TTI services industry. The Traffic&Travel Information Services Platforms (TTISP) which predominated by the government or the business enterprises are quickly constucting. At this construction stage, the theories of the system and the breakthrough of the practical key technique are urgently needed. This paper relies on the series related research projects and actual TTISP construction practice, firstly carries on elaborating to the technical architecture of TTISP systematically, and then carries on a thorough research on key techniques of TTISP. Based on the foundation of the construction practice, some theories of key technique will be breakthroughed and be verificated in the construction practice, this will provide reference for the following TTISP research and construction.This paper carried on a research to the architecture of TTISP first. This paper analysis and designs the architecture of TTISP at many levels and in many ways, such as the service contents, general architecture, software architecture, working flow of data and key technique etc. The architecture is built by SOA and distributed component. The concept of services is enhanced by services content and services techniques.The platform provides diversified TTI and releated GIS services, and have adcanced, opening and expandable etc. characteristics.Geogaphic Information System for Transportation (GIS-T) is one of the key foundation techniques of TTISP. In order to overcome the shortage of slow response speed of the WebGIS currently applied, this paper designs and develops a map service engine based on tile map. That engine provides national raster map services, full text and spatial searching services and carries out a complete set client end API. Moreover after analyzing more various location reference method, according to the applied present condition of local TTI service, this paper puts forward a kind of practical and viable location reference method, and be applied to TTISP. These two key GIS-T techniques all obtained good application effect.TTI's collecting is the data source of TTISP. The data collecting techniques are divided into fixed types and mobile types. This paper carries on analysis and contrasts to various fixed types collecting techniques firstly, then analysises and researches the sample period and quantity requirement of floating car which must meet the estimating accuracy of traffic parameters.TTI processing is the most important and difficult part of TTISP. This paper first puts forward the general technique solution route of TTI processing, then chooses some key techniques to study particularly. Include: (1) Floating car information processing. Aim at the complicated circumstance that the large-scale long partition floating car information processing, this paper puts forward a comprehensive map matching algorithm and travel time estimation algorithm. The map matching algorithm solves several techniques difficult points, such as oppsited direction parallel road matching, same direction parallelism road or overlapped road matching, complicated cross matching, road searching of discontiguous matched road, quickly withdrawing of the candidated roads etc., and uses much techniques measure to strengthen the robutstness. The travel time estimation algorithm adopts muti-FC weighted average fusion method, and reduces the estimate error. (2) Short time of travel time prediction. Aim to make up the shortage of statistics prediction method and neural network prediction method, the support vector machine (SVM) was applied to carry on travel time prediction and the simulation experiment express that SVM can carry out the effective prediction to travel time. (3) Dynamic route-planning. This paper researches the common used route-planning algorithm-A* firstly, and studies its optimization method (sorting and double direction searching), based on this foundation, then reasearches the comprehensive route-planning algorithm which combined heuristic and hierarchical road network algorithm. The algotithm solves several detouring problems in the route-planning, such as using Dijkstra as the district route-planing algotithm, divided network layer not appropriate, layer switch standard not appropriate. It is applied to the on-line route-planning and navigation in TTISP successfully.Publication technique of TTI is usually neglected by the researcher and also lack viable theories and standard instruction in the engineering practice. This paper puts forward one practical and high-efficiency terminal TTI publication protocol based on LINK. This protocol turns to make some cushion and the preparation of techniques for the TTI services standard, and be applied to engineering practice. The TTI publication data quality decides whether can carry on an effective route guidance. Currently there has little research on TTI publication data quality in the domestic. This paper puts forward a TTI publication data quality measurement and evaluation system exploringly, the main content including: the parameter, element, standard and process etc. This paper conducts a solid example and verified that the TTI publiucation data quality measurement and evaluation system is viable.At the end, the paper introduces the Rocent business TTISP serving the whole country; the author is responsible for research and development of this platform. The architecture and series key technique which put forward in this paper is applied in the platform. The platform carries on collecting, processing and publishing TTI. The information publication terminal include: website, mobile phone and navigation devices.This paper carried on a thorough research to the technique system of TTISP. The majority research result were applied and verified in the engineering practice.This will provide important reference to the research and construction of TTISP and have important theories and realistic meaning to the development of TTI service industry of our country.