Research On Landslide Disaster Loss Analysis Model Based On Integrated Monitoring Of Satellite,Airborne And Ground-based Data

Because of the complex geological and geomorphic environment and frequent landslide geological disasters in China,economic losses and casualties are very serious.Scientific and reasonable prediction and assessment of landslide damage has important practical significance and research significance for disaster prevention and mitigation.Due to the complexity of landslide formation mechanism and the widespread distribution of landslide disaster points,this study,based on GIS spatial analysis technology,uses multi-source and heterogeneous data of space-space integrated monitoring to study landslide from four aspects: inducing factors,pregnant environment,social vulnerability and economic vulnerability.Space-Earth integration emphasizes the diversity of monitoring means,including satellite remote sensing,aerial remote sensing and ground monitoring.The data involved include optical remote sensing image data,microwave remote sensing image data,unmanned aerial remote sensing data,geological survey data,and socioeconomic statistics data.Based on the original data processing and information extraction,this paper takes 2017 as the standard data year to simulate spatially the GDP output value of each district and county in Hechi city of Guangxi Zhuang Autonomous Region,in order to obtain the product of fine grid GDP spatial distribution with a rate of 500 m.Using the historical data of landslide disasters in Hechi city in recent years,the loss of landslide disasters is evaluated by fuzzy comprehensive evaluation method,the weight of influencing factors is determined by AHP hierarchical analysis method,and the complicated landslide disasters process is analyzed quantitatively,objectively and effectively.The magnitude of the fuzzy comprehensive evaluation index obtained can reflect the strength of landslide disasters.Through the establishment of direct economic loss index,the correlation between each landslide disaster's fuzzy comprehensive evaluation index and direct economic loss index is analyzed one by one.Finally,the direct economic loss model of landslide disaster in Hechi city is established.Generally speaking,the whole research method of this paper is to select a certain year as the standard year.The preliminary preparation work is to spatial process the economic data of that year,and calculate the real value of the ground elevation value and annual precipitation value of a landslide disaster point.When landslide disaster occurs in the early,middle and late stage,the fuzzy comprehensive evaluation index of the disaster point can be calculated by the method proposed in this paper,and then the direct economic loss can be estimated according to the model.The accuracy of the whole model verification is between 5% and 25%,and the error is within reasonable and controllable range.The model estimation results are basically consistent with the corresponding disaster data.It can be concluded that the direct economic loss model of Hechi City can effectively evaluate the possible damage caused by landslide disaster,and the simulation results can provide policy basis for the disaster prevention and reduction work of local relevant government departments,which has great practical significance.However,based on the current research results,there are still some problems,such as the data selection,the reasonable processing of night lighting data,the selection of evaluation factors of fuzzy evaluation model,and the great limitation of historical disaster data.With the popularization of GIS monitoring means and the continuous exploration of GIS spatial data analysis ability in recent years,it will play an important role in the integrated construction of landslide disaster database and real-time assessment of landslide disaster loss in China in the future.