正射影像图技术在铁路勘测中的应用与发展

研究目的：分析正射影像图技术在铁路勘测中的实际应用及其发展前景。 研究结论：大规模地制作铁路航空或卫星数字正射影像图具有周期短、见效快、节省资金、降低对专门技术设备的需求等特点，能提高信息的现时性；在铁路规划、设计、征地、工务和土地管理中使用数字正射影像图能创造良好的经济效益和社会效益；利用高分辨率的卫星影像或航片制作的各类比例尺正射影像图，可为新线铁路勘测设计的各个设计阶段提供更加直观、信息量丰富、地理精度高等的设计所需信息；将设计区域的地面模型数据（DEM）和正射影像迭合在一起，加上设计的各类铁路设备模型，可以实现设计区域的三维影像图，再沿设计线路加上一条飞行路线，即可实现沿设计线路的三维真实景观图。

Application and Development of Positive Photography Image Pattern Technology in Railway Survey

Research purposes: The analysis is made for the real situation of positive photograph image applied in railway construction and its development prospects. Research conclusions:Fabrication of aerial or satellite digital positive photography image pattern for railway by(large-scale) has the features of short period,becoming effective rapidly,saving cost,lowering the requirement for(needing) special technical devices and increasing the reality of information.The good economic and social benefits can be created if the digital positive photography image pattern is used for railway plan,railway design,requisition of land for railway,railway track maintenance and management of land.The vivid,rich and high geographic accurate information necessary for design can be provided for entire design of new railway line with all kinds of scaled positive photography image pattern made from high-resolution satellite image or aerophotographic image.If the Digital Elevation Model and positive photography image pattern are coincided each other along with all models of railway equipments,the(3-dimensional) photography image of designed area can be obtained,besides,the real 3-dimensional landscape image can be realized if a flying route is added over the designed route.