Visual Simulation Of Mountain Landslide Process Based On Multi-source And Multi-temporal Remote Sensing Data

Landslide is one of the most widely distributed and the most frequently be occurrence of types of geological disasters in nature,common in a variety of mountain environments,with a burstiness,uncertainty and randomness,often pose a great threat and serious challenge to human life and property safety.In the first time,the visual simulation and analysis of landslide process shall be carried out to obtain the information such as the buried scope,accumulation characteristics,risk degree,etc.of landslide disaster,which can provide scientific and important support for disaster emergency disposal and the next step landslide assessment and prediction.Although a lot of research has been carried out on the visual simulation and analysis of landslide disasters,there are still some problems,such as single extraction of landslide information,low simulation efficiency,poor visualization effect and so on,which is difficult to support effectively and can not respond to the emergency command and rescue work of landslide disaster in time of the visual simulation and analysis of landslide process.In order to solve the above problems,based on multi-source and multi-temporal remote sensing data,this paper focuses on the technical methods and processes of visual simulation and analysis of landslide process,and deeply explores the key technology and method flow such as the extraction of landslide feature information,the interpolation of landslide space-time process,dynamic construction of threedimensional scene of landslide disaster,etc.,in order to realize the visual simulation and analysis of landslide process.The main research work and results of this paper are as follows:(1)On the basis of traditional two-dimensional information extraction of landslide based on single remote sensing image,multi-source and multi-temporal remote sensing data are extended to extract multi-dimensional feature information of landslide,and the multidimensional morphological structure information of landslide is obtained.The multi-source and multi-time remote sensing data is normalized,and the two-dimensional information such as landslide range and bearing body is obtained by object-oriented extraction.The threedimensional morphological structure information such as landslide body,accumulation body and slide is extracted and quantified by using the excavation and mathematical calculation.Calculate information such as landslide area,volume,and distance,and provide interactive modification of result data and multidimensional display of information.(2)An interpolation method of landslide space-time process under spatial constraint rules of landslide process is proposed,and the spatial data of sliding body at different times are obtained.Based on the analysis of spatial constraints of landslide process and the discussion of the interpolation of space-time process,a space-time interpolation method for landslide process based on multi-source multi-temporal elevation data using tetrahedral interpolation shape function is proposed,which is the spatial shape under landslide space constraints.That is to say,the landslide process is simulated from the point of view of spatial shape under the condition of landslide spatial constraint,and the landslide simulation spatial data at different times is obtained,which effectively supports the visualization of the landslide process.(3)The design realizes the dynamic construction of the 3D scene of landslide disasters,and supports the dynamic analysis and interaction of landslide disaster information.Supported by virtual geographical environment technology and high resolution remote sensing data,the rapid construction of 3D scene of landslide disaster and dynamic display of interpolation simulation data information of landslide process are realized,Interactive acquisition and display of the range of landslide,buried area of landslide,landslide volume,accumulation characteristics,risk degree and other disaster analysis information are supported.(4)The prototype system of visual simulation and interaction analysis of landslide process was developed,and case experiment analysis was carried out.Based on the above research results,the prototype system of visual simulation and interactive analysis of landslide process was developed,and the landslide feature information extraction,landslide hazard spatiotemporal process interpolation and landslide hazard three-dimensional scene dynamic construction were systematically integrated,and “10.11” Jinshajiang white landslide was selected which is tested and efficiency analyzed.