Google Earth卫星地图数据在铁路勘察设计中的应用研究

摘要

In the small-scale map which is commonly used for route selection design in the early stage of railway survey and design, there are a number of problems:the data in the map are out-of-date and come with the shortage of the newly-built ground buildings information which have great influence on the route alignment;the digitization level is poor; the efficiency of manual work for data acquisition of ground elevation is low, and so on. To solve those problems, this research put forward a new method, which is based on Google Earth platform for quickly downloading the maps, then automatically splicing them into route strip map and then automatically extracting ground elevation data of route longitudinal and transverse profiles in batches. Furthermore, secondary development was carried out in this research by using VC++and Google Earth's COM API function. In the paper, this new method's implementation principle and algorithm was introduced, and the reliability and high efficiency of this method were analyzed in combination with actual projects. This method can serve as a good, convenient and fast method for route selection design in the early stage of railway project.%针对目前铁路勘察设计前期阶段线路方案所采用的小比例尺地图陈旧，新增地面建筑物缺失，对线路走向影响大；数字化程度低，人工获取地面高程数据效率低等问题，提出基于Google Earth平台实现快速下载地图、自动拼接成线路带状图和自动批量提取线路纵、横断面地面高程数据的方法，并采用VC++和Google Earth的 COM API函数进行二次开发，介绍该方法的实现原理及算法，结合工程实例分析该方法的可靠性及高效性，为铁路前期研究选线设计提供一种良好的便捷方法。