Research Of Modeling Method And Application Of Railway Location System' Geographical Environment Based On Remote Information

According to China's medium and long-term railway development plan, China will build more than 20.000 km high-speed passenger line and Inter-city Railway to 2020. The regions' economy is developed and towns are serried where high-speed railway and Inter-city Railway pass through, and geographical environment and geological environment is complex along the railway, therefore, railway location and design pay more attention to the environment, landscape and geology location. The traditional contour map model has been unable to meet high-speed rail and inter-city rail's location need. integrate Remote sensing, digital photogrammetry technology, virtual reality technology and digital geological technology, building one Three-dimensional visualization location geographical model which meet the geological location and environmental location requirements at the same time, and let engineers conduct the location scheme design and decision-making in this three-dimensional visualization of the geographical environment, It not only a railway survey and design integration, intelligent research issues to be resolved, and the more modern design requirements. Based on this thinking, the paper make "The modeling method of Three-dimensional geographical environment and application Of railway location system based on remote sensing information" as the theme, and have researched the methods and key technology which involved in. put forward a set of methods and their realization from the modeling methods and algorithms. Main research content and research results are as follows:1. Aim at the belt shaped and arge-scale topographic features of railway location, aerial survey, satellite remote sensing data as data sources, and all-digital photography system as measuring tool bring forward intersected collection method to get the strong belt shaped terrain features of the terrain data, it can reduce Construction of the three-dimensional topographical data redundancy to the greatest degree. Put forward the method of DEM Error detection and omissions Based on the improvement of slope RMSE and three-dimensional visualization for the Collect terrain data, achieved effective detection and omissions for DEM a gross error and guarantee the modeling accuracy of three-dimensional Geographical environment.2. Bring forward the modeling methods by the integration of vector and raster of location system's three-dimensional geological environment. Used the geological interpretation of remote sensing images in railway location system first time. Proposed the concept of geological objects of cultural identity according to the geographical environment features of the location system, make the geological object' name and ID as it's cultural features and as the special kind of vector data, overlap the Vector 3-D targets in accordance with the precise location, and realize the precise location in three-dimensional geographical environment and effective recognition in the internal computer. Proposed the Modeling method of Raster image, achieved the interpretation of remote sensing images accurate positioning in three-dimensional space of geological objects based on TIN and restrict TIN model. And directly express the geological information by remote sensing interprets images. Establish the expression and description pattern which vector, raster images presence at the same time for Geological targets, and on this base establish the Intuitive three-dimensional geological environment.3. Bring forward the information management and organization method of location system based on Hypermap Model. The first time introduce the concept of Hypermap into railway location system based on remote sensing orthophoto map image environment; establish the railway location Hypermap Model Based on the geographic information, geological, hydrological, geological knowledge. Achieve these non-linear relationships between the information storage, organization, management and browsing Based on Hyper directory structure model. Provide the illustrated geological, geographical and geological knowledge environment for engineers.4. Bring forward the modeling method of railway geological information database based on the multi-database. According to the geological conditions diversity of railway location and design, classing and indexing to the different types of geological targets. In geological knowledge express way, proposed the three-dimensional visualization knowledge express method of user external knowledge. For the different geographical environment of location geological knowledge involved. Construct the valley, frozen soil, sand areas, and other three-dimensional geographical environment and express knowledge in this environment, And realize the three-dimensional visualization express of the knowledge. For the complexity of the railway location and design and cognitive psychology as the basis, proposed the application method of knowledge found on the Case-based reasoning.5. Exploration the geological railway location technology based on realistic three-dimensional geographical environment. Using three-dimensional targets connected to the database and information technology, solve the technical problems of the direct railway location and design in three-dimensional environment, including the local lines location in three-dimensional geographical environment, the location method in adverse geology regional based on remote sensing geological image and so on. According to the adverse geological targets' type and position of the lines pass through, achieve automatically extracted the geological knowledge from the knowledge base, and gives the location recommendations to guide the engineer railway location in adverse geological regions. According to geological complexity of mountain terrain, such as the location of the design characteristics, proposed the thinking of directly get scheme evaluation index from design information of scheme design result. Establish the valuation model of lines in complex geological regions Based on a three-dimensional geographical environment, and resolve the appraisal problem of multi line schemes.6. Comprehensive Application of three-dimensional space observation of principles, realistic image mapping technology, computer animation, virtual reality technology etc. and adopting OpenGL 3D graph library and Visual C++ as development tools, Achieved the real-time dynamic 3D visualization of the three-dimensional line scenes ,And combine with the orthogonal projection and perspective projection design models, it's not only be used to livingly express design results but also merged into the whole design course, thus the ideal of combining 2D design with 3D visual design put forward in this thesis was realized.7. Develop a geographical location modeling platform Based on the proposed theory and method. This platform achieves the modeling method and application technology which the paper proposed of three-dimensional visual location geographical environment based on aerial survey and satellite information. And tested the system's main function with an example. Verification and test results show that the proposed method of modeling and application of technology is feasible. Based on the prototype system which establish according to the paper approach, It Can be more easily develop the three-dimensional visualization location system which integrate the remote sensing technology, virtual reality technology, digital geological technology, space technology and so on. While this research is against the railway location design issues, and its research results can be directly applied to Highway route system design research..