Design Of Rail-Track Engineering GIS And Investigation Of The Related Key Technologies

Rail-track engineering department manages all railway equipment and parts which are very close to landform and physiognomy. Due to the fact that the normal Management Information System (MIS) cannot meet the requirements of modern management to the important spatial data,it is therefore necessary to develop rail-track engineering Geographical Information System (GIS).Based upon application background,this thesis firstly analyses the requirements of rail-track engineering GIS. Then the data contents,data classification,data format,coding and layout of spatial data (digital map),are worked out and discussed. According to the specific equipment characteristics,operation requirements and relational database features,the corresponding coding rules are made.Next,the thesis presents the overall design,the objectives and architecture of rail-track engineering GIS. According to the functionality of the GIS,the system is divided into eight parts,that is,project management,map input and maintenance,query,play of motion images,browse of vector graphs and grid drawings,and so on. The system stores spatial data and characteristic data into central database,and provides services to users in server/client mode.As the research emphases of this thesis,several key sub-systems are designed and realized. The digital map input and maintenance subsystem performs format conversion,editing and updating of spatial data;the rail-track video playing subsystem uses video recording as reference data,then plays,inquires and traces the corresponding frames in synchronous to the scaled mileage,realizing the query of the active picture frames;the digital map query subsystem fulfills the map query,preview and spelling of digital map orthograph.