Capturing one of the worlds longest tunnels

作者：莫妮卡·米勒·罗杰斯（Monica Miller Rodgers），2016年5月

When the Gotthard Base Tunnel officially opens in June 2016 as part of the New Rail Link through the Alps (NRLA), a construction project 20 plus years in the making at 9.8 billion Swiss francs will be one of the world’s longest and deepest railway tunnels. At 57 kilometres long and with a rock overburden of 2,300 metres, the tunnel increases the total transport capacity across the Swiss Alps while reducing passenger travel time between northern and southern Europe by one hour. With minimal gradient and wide curves, the route is also a flatter, lower-level journey at only 550m above sea level. The whole tunnel system measures a total of 152km, plus almost 50km of new built outdoor tracks.

When Grunder Ingenieure AG, a leading Swiss engineering firm specialising in rail surveys and long-time user of Leica Geosystems solutions, was sub-contracted by the Alptransit Gotthard AG, the firm knew it would be a challenging task but one for the history books. One of the main tasks, before the tracks open for the test operation, was to capture all the infrastructure of the tunnel for as-built documentation.

“有几个利益相关者从事整个项目，我们的任务是注册整个基础设施，以收集瑞士联邦铁路基础设施数据库。所有这些用户现在都可以访问此信息。” Grunder的成像，激光扫描和移动映射总监Gilbert Roulier说。“进入底座隧道和室外轨道也提出了我们需要与工程师和测量工具一起解决的组织挑战。”

The firm selected the Leica Pegasus:Two to safely and efficiently capture the entire infrastructure of the newly-built open tracks. In combination with Leica Geosystems total stations, Grunder was able to provide a complete database of 3D imagery and point clouds covering the rails, signage, posts, electrical lines, and further installations and structural elements.

Explore next chapter:On the fast track

故事：捕捉世界上最长的隧道之一
Chapter 1: Introduction
Chapter 2:On the fast track
Chapter 3:传感器合并数字现实