Abstract：Research purposes: The key technology of GIS—based railway alignment design is the integration and transformation of spatial data．and the unified spatial data framework based on the geodata standard iS the basis for transforming the engineering data into the geospatial data．By using a comprehensive space transformation mechanism，the unification of engineering data with GIS spatial data is realized and the visual analysis and applicable platform can be offered for the engineering design by using the GIS organizational capacity，spatial analysis and 3 D modeling expression technology．
Research conclusions: GIS—based railway lalignment design not only provides an extensively applicable platform for engineering planning，engineering design，data acquisition，quantitative statistics and 3D display based on space information technology，but also provides a more reasonable basis and a new and more scientific design means for data organization for space construction of large area．This reflects the advantages of GIS—based digital railway alignment design compared with the traditional plane graphic design．
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2010, Vol. 27 
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