Based On The Extent Of Gis Technology, Geological Disaster-prone District Evaluation System - Dalian City, For Example

As the development of population increasing,and the economic activity,natural resource are excessively exploiting,not only ecologic environment has been caused to pollute and deteriorate,but also the geologic disaster often happen.people's living circumstance become worsening day by day.The development of social economy has been restricted by the problem of environment step by step. Along with the prevention of geologic investigation of disaster has launched spread all over the nation.How to divide district of geologic disaster's level,how to program the dangerous of geologic disaster,how to save the magnanimous data,how to solute the link of database,how to achieve the visible of geologic disaster's fruit and enjoyment together database, which become the difficult problem in the work.The thesis adopt Geographic Information System(GIS) to discuss and explore how to divide district of geologic disaster's level.GIS prossess powerful function which can handle data and analyse space,and which is the ordinary tool of investigation and dividing district of geologic disaster,but,only depend on GJS is difficult to deal with the geologic disaster's level quantitatively.Consequently,the thesis set up the divided district assessment model of frequent geologic disaster's level,which to be lead by muti-classification fuzzy pattern recognition model,discuss combining GIS with frequent geologic disaster's level of district assessment model is a new method that deals with the geologic disaster investigation and divided district project.It provide a new theoretical method.According to geo-environment characteristic,summing up predecessor's experience,the paper has set up the occurrence level of geologic disaster district assessment and established classifying standard of index. After that,the paper analyzes systematically quantifying method of index,sifting method of index-comparing one with one method and conditional broad least variance method,and weighting method of index-analytic hierarchy weighting process.The theory of multi-classification fuzzy pattern recognition model is introduced comprehensively,which is based on the relative membership degree and function,The analysis module of muti-classification fuzzy pattern recognition model is developed with C++Builder6.0 software,for the purpose of geo-environment quality assessmentBased on thedevelopment platform of MAPGIS6.1,the spatial graph database is established.By linking outside database,the property database is performed. Then GIS transfers the property database with interface,so as to achieve link between graph and property,thus forming spatial database.By middle data documens,the integation is accomplished between the assessment analysis module and GIS,thereby achieving transferring data of both sides and carrying on spatial analysis.The thesis takes Dalian district's investigation of geologic disaster project,analyzes its geology environment background,chooses the main factors influencing geo-environment quality,and establishes the spatial graph database and property database of Dalian district's geologic disaser.Based on this system,the level of frequent happening district is assessed,and the result shows that the level of frequent geologic disaster is classified three classes:moderate district,low district and not growable district So it further indicates that the system is feasible and very practical and that the assessment model is rational.