Landslide Risk Assessment Based On Rs&gis Ningjiang County

Landslides, one of the most harmful natural disasters in the world, always cause vast economic losses and causalities. Considering that, it becomes not only the important mission of landslide study at present, but also the necessity of disaster affected areas to know how we can monitor the trend, distribution and activities of landslides effectively, investigate the degree of damage, conduct the forecast and estimation, and provide scientific evidences for predicting and dealing with landslide disaster.This essay regards NingQiang County as the study area, the system of landslide disaster evaluation index has been built through the way of analyzing the key impacting factors of landslide disaster distribution such as geology, litho logy, geography, the earth’s surface and hydro meteorology and so on and combining the reality of NingQiang and the selection principle of landslide disaster evaluation index such as litho logy, fracture zone, gradient, altitude, vegetation, river, road and rainfall. The essay also researches the space approach of landslide evaluation index, extracts a series of thematic maps of landslide index and conduct the date input, in the way of adopting the fusion image of SPOT after the earthquake in May12,2008, terrain data, geology survey figure data and hydro meteorology data and other related data, using30m*30m grid cell, and being based on fold, buffer, AHP, and state space analysis of RS&GIS. On the basis of these, by using FNN and programming in Matlab, the landslide hazard assessment of Ning Qiang has come true. Through the analysis of the features of landslide disaster in Niang Qiang, the precautionary measures have been put forward. The chief research achievements are listed below:(1) Analyzing the chief space impacting factors of the development of landslide disaster and building the system of landslide hazard assessment of Ning Qiang;(2) Having realized the index extraction of landslide hazard’s impacting factors and space database building;(3) Conducting the landslide hazard assessment and gaining the evaluation map of it by using FNN;(4) Putting forward the precautionary measures by combining landslide hazard assessment and the practical work of disaster prevention and warning in Ning Qiang.