| As a national artery, railway is directly related to the the development and prosperity of the region. With the implementation of western development, The country takes the national railway in the region as the most important traffic-building. The general methods of geological survey seem to be inapplicable for the railway route selection of these areas, for they will result in many problems including limited field survey range, large outdoor work load, slow work progress and bad survey quality. In addition,as the current railway design is carried out in the 2D map, the stereoscopic effect is lacked. In railway engineering geological investigation in the use of remote sensing, three-dimensional visualization of new technologies, new methods, and is well positioned to overcome the above limitations, to speed up the progress of the work and to increase the overall project and to ensure that the level and quality of geological survey. Remote sensing is the important means to obtain the surface information and the others.The basic information obtained by remote sensing technology meet the needs of some Geological Survey .Remote sensing images with bright, clear images, vivid features of the terrain morphology . Using the future ,we Can expand the scope of geological survey, overcome the limitations of ground investigations, and enhance predictability and reduce the workload of field, enhance the effectiveness of investigations. Through remote sensing and three-dimensional visualization techniques,we can line through the area on the formulation of the terrain, topography, surface features, geological conditions in the overall understanding and grasp intuitively accurate extraction along the engineering geological conditions and adverse information such as geological body. The railway projects in geological exploration, remote sensing technology provides a new means of their macroscopic, intuitive and integrated any other unmatched by ground surveys, of which role can not be substituted by other means, has become a railway engineering geological investigation one of the means indispensable. Remote sensing technology in a variety of adverse geological phenomenon found is one of the most effective means to compensate for vision restricted by the limitations of ground-based survey. Survey and design the latter part of the site needs to add in the remote sensing survey has allowed geologists to better avoid the omission. Survey and Design in the early stage of development of remote sensing,investigation can be found from the macro area of the main engineering geology, hydro-geological problems, engineering geological problems of the lot, as well as the railway bridges, tunnels, and so the existence of key projects of the main engineering geological problems of the railway line program choose to provide more reliable than the geological basis and the views of the election.which plays an important role in program to stabilize the line, the correct line selection decision-making to avoid major mistakes and improve the quality of survey and design.Dianxi mountains is located Yunnan-Guizhou Plateau,which is steep terrain, cutting broken the complex geological conditions, seismic activity, concentrated rainfall, a fragile ecological environment, is one of the most serious landslide, debris flow disaster. In this paper, a large amount of data collected on the basis of Dianxi to the election of a railway line to carry out investigation and study of geological disasters in remote sensing.In this paper, SPOT-4 / 5 satellite images for the sources of information,with the ERDAS 8.7, ArcView and ArcGIS software platform to the address, combination of geological survey projects the needs of the line, use of a variety of image processing, after making the image more suitable for visual interpretation; Make use of existing data to generate contour DEM model,than superposition with the remote sensing images, than establish the three-dimensional visual image of railway projects along the geological landscape; According to the direct and indirect signs to establishment the landslide, debris flow, collapse of several typical geological disasters in the interpretation of body signs of the South-West Hill. According to the established interpretation of signs and images of three-dimensional visualization of the line to be selected to interpret the regional body for disaster research. According to the results of interpreting, evaluation and analysis the geological disasters, impact in the body of the railway line,and analysis the focus point of disaster,than made the reasonable through program. In this paper, interpretation of the summary can provide help to be follow-up of major projects in this region. The results of Interpret can improve the results of railway geological survey of artificial intelligence,provide support services and decision-making for the railway-line selection and line selection program.Remote sensing technology is an emerging high-tech means, the use of which to carry out geological survey of the railway is not only necessary but also feasible. Remote sensing technology can run through geological disasters, regional tectonic interpretation of fracture and water systems, but also through high-precision three-dimensional model of remote sensing imagery to provide for repeated use of the real, objective, information for analysis of the macro-landscape images, supporting railway route selection decision-making. Remote sensing images of three-dimensional visualization and image analysis method for dynamic geological survey along the railway line has opened up new ideas,Geological survey of the railway to accelerate the process of modernization work of great significance and practical value. With step-by-step theory of remote sensing technology and remote sensing images to improve spatial resolution, temporal resolution and spectral resolution improvement of remote sensing technology will become the decision-making Railway Geological Survey and one of the means indispensable.
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