有计划、有选择地从国外引进一些先进测绘仪器,对加速实现铁路勘测设计的现代化具有重要意义。激光测距仪的使用不仅把“量距不拉链”的愿望变成了现实,而且精度高,速度快,改善劳动条件,提高工作效率,是一种先进的测距方法。西德奥普托厂(opton)生产的几种激光测距仪具有精度好、质量轻、操作简便、自动化程度高等特点,比较适合航测外控和铁路勘测 The planned and selective introduction of some advanced surveying and mapping instruments from abroad is of great significance to accelerating the modernization of railway survey and design. The use of laser range finder not only to “span the zipper,” the desire to become a reality, but also high precision, high speed, improve working conditions, improve work efficiency, is an advanced ranging method. Several opto-produced laser range finders have the advantages of good precision, light weight, easy operation and high degree of automation. They are more suitable for aerial survey and railway survey