The Establishment And Application Of The Spatial Database On The Geological Hazard In NeiKun Railway Based On GIS

The shaping and developing disciplines of Geological hazard are very complicated due to the fact that they depend on the combined effects of terrain, geology, weather, engineering and people's activity, etc. Meanwhile, the Geological hazard data contain remarkable spatial character and complex attribute information. How to save, manage, exchange and make the best of the hazard data effectively? It's not enough to use usual database management system only. Therefore, the use GIS technology, carries on gathering, the memory, the classification, the inquiry retrieval to the complex geological disaster space data, as well as the establishment application model will be an effective way.In the Neikun railway is located in our country land topography three levels of steps and ladders between one, two levels of steps and ladders. The line mainly goes through many places in the Sichuan basin to Yunnan-Guizhou Plateau intermediate belt. For the influence of rises prosperously of the Qinghai-Tibet Plain, this section presently occupies the intense lifting time, the mountain steep slope is steep, the water depth flows anxiously, the terrain geological condition is extremely complex, geological disaster frequent. Based on the wholly design of the Geological hazard database, this thesis begins with setting up the Geological hazard graph database with MAPGIS tool. Following the work, i.e. vectorization, graphic edit, error adjustment and map collection. Then attribute database is set up with Microsoft Access. And more, the conjunction of graph and data is realized seamlessly by setting a main-keyword in the database. Which more, the Geological hazard information system is set up by Visual BASIC and MapInfo tools, which realizes the Geological hazard's management, query, statistical analysis, etc. Lastly, the correlated data selected from the system to realize auto-forecast for the Geological hazard (e.g. risk analysis), and discuss spatial analysis for the Geological hazard, which includes terrain analysis, overlay analysis, buffer analysis to uncover shaping rules of the Geological hazard. At the same time, experimental data set is imported to the Geological hazard database to validate the Geological hazard database's reliability, feasibility, etc.The thesis discusses the theories related to Geological hazard database design and analysis, as to find a solution to manage data effectively. And some useful conclusions and experiences in the process of system design and realization are offered in the end.