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A study on the application technique of remote sensing image for optimum route selection of the two-tract line railroad
Semyung university, Dept. of civil engineering
Background and Objective
Practical use of 3D Perspective Image Map in Construction field is on an increasing trend after going through many changes in creation method and technology and ever since the composition of various Geographic Information became possible by Ortho-Projection technique using Digital Map and Satellite Images.
Since the construction planning and designing through the composition of pictures, image data and three-dimensional presentation of Digital Topographic Map is possibly carried out, the application of Spatial information system to the construction field is being considered as a great solution for a new construction planning technique. Because High resolution Remote Sensing Image and GPS Information to substitute for the existing Digital Topographic Map and Thematic Map have been already provided and it seems that field application to various fields is highly possible, in this study, we collected detailed topographic information about the routes of expressway and local road which is now construction-expected and carried out Stereo Terrain Analysis of the construction-expected planned-routes to supply basic topographic spatial information for the most reasonable optimum route selection.
To get local environmental information about the chosen districts, you can collect topographic map, air-photo and satellite image data and create 3D Perspective Image Map using that information and then make use of the 3D Perspective Image Map for analysis of local environment. To explain the steps that we took in this study briefly; we firstly created Ortho-Image of Yangsan and yongwol using satellite images from Arirang 1, LANDSAT TM(America), SPOT(france), IKONOS(USA) and topographic map made by National geographic institute (NGI) and other information about the target district. And created 3D Perspective Image Map using the Ortho-Image and DEM. And then performed simulation using the multidirectional 3D Perspective Image Map.
After all, the objective of this study is to find the optimum route and carry out the most reasonable construction planning/designing through this whole procedure.
3 Dimensional Image Creation
For the 3D Terrain Analysis of satellite images, collect satellite images of target district according to the purpose and property of objects and use them after color-composite. Differentiate Road network files from Contour Line files of Digital Topographic Map which was made to get DEM(Digital Elevation Model) of target district and use the suitable software for processing of collected topographic information. The three requisites which should be primarily prepared for this study are as follows:
Then survey the suitable s/w solution for integration of Vector and Raster. In this study, PCI Geomatics is adopted as the digital image processing s/w for Spatial analysis
- the initial file of the HDF formated satellite image of target district(Yangsan) captured by EOC sensor of Arirang 1, and the IMG formated satellite image of the same district captured by TM sensor of LANDSAT 6, IKONOS for display and stereo image generation at yongwol railway.
- The files of 1:5,000 Topographic Map made by National geographic institute (NGI) as a digital map and road's planned route data;
- CAD files of road's planned route of the target district.