The Study Of Monitoring Management System Technologies For Vessel Based On Active GIS

Geographical Information System(GIS) is under the supportation of computer hardware and software systems, and based on database, data collection, storage, management, analysis and description of a part or the whole surface of the Earth and space and the geographic distribution of the data. It is the space information systems which is servicing for GIS research and policy.Recently, particularly since the middle of 1990s, with the rapid development of computer hardware technology, wireless communications and Internet technology, people eager to seek out fixed network and Internet cable restraints .So the mobile cellular communications technology (for GSM), the Global Positioning System (GPS), WAP technology, GPRS technology appeared in succession, and to varying degrees in various fields to meet the people's needs. The corresponding GIS technology will change from the single-based GIS to wireless communications. Until recent years, GIS lot to promote the rapid development of mobile devices based on the evolution of mobile computing environment. It goes without saying that the smart terminal, GPS, wireless Internet and other new technologies using in the GIS technology, GIS will enrich and expand the application of GIS theory.Based on systematical analyzing active GIS, this paper is Focus on the following aspects:(1) Focused introduce the format and structure of S-57 ENC and Maplnfo map. A research focus in this paper is the conversion from S-57 ENC format to Maplnfo format.(2) Another study focused is on the principle of active GIS, Multi-object class definitions and achievement of multi-object feature's creation and data updating.(3)Combinating with advanced wireless communications technology, this paper apply the active GIS technology to vessel real-time monitoring system, introducing the structure of the system, the communication protocol analysis, the operation of ENC and data management of the ship.(4)Using Multi-object class in the application of targets displaying in the electronic charts, route design ,CPA/TCPA computing ship-scale displaying.This vessel monitoring system has become a commercial product along the Yangtze River in the communications and navigation and shipping management, and it has good stability and scalability.