美国“东北走廊”铁路全长734公里,铁路改建的测图工作于九个月内全部完成。由于时间紧迫,这样的工作量超过了任何独家公司的能力,因此共有13家地面测量和航空测量公司的300～400名技术人员参加。合同包括在沿线建立800个二级测量标桩,并完成2,400幅等高线间距为 The total length of the U.S. “Northeast Corridor” railway is 734 kilometers. The mapping of the railway reconstruction is completed within nine months. Due to the time constraints, which exceeded the capacity of any exclusive company, a total of 300 to 400 technicians from 13 ground-based survey and aeronautical survey companies participated. The contract included the construction of 800 second-level measuring stake along the line and the completion of 2,400 contour lines with a spacing of