To manage the risk, the owner planned to use traditional survey methods, monitoring 90 targets every hour. Manual surveys would incur the cost of deploying a survey crew throughout the construction. A robotic total station could be programmed to conduct unattended surveys, but the problem of retrieving and processing the data still remained.
GEO-Instruments was able to provide a solution, using an robotic total station, a cellular internet connection, and a web server. Data from the total station was forwarded to the web server hourly. The web server checked for alarm conditions and then updated graphics and trend plots, which could be accessed via a web browser. Alarm notifications could be sent by sms text messages.
GEO’s automated total station (AMTS) provided early warnings of rail movement on multiple occasions. On each occasion, the warnings were provided more quickly than required by FRA regulations.