GEO-Instruments in New York City is providing precise optical monitoring of the structures around the building in the foreground, which is being replaced. The green dots overlaying the photo show the locations of prisms, small optical devices that serve as remote targets for an automated total station.
GEO’s Zach Hill configures the total station, which is located on the roof of a building opposite the construction site. Fully automated, the system transmits measurements to GEO’s data center every 8 hours, where they are processed, checked for alarm conditions, and displayed on a secure project website.
The system obtained baseline data before construction began and is now monitoring for possible deformation or settlement as construction proceeds. Optical monitoring is not only reliable, cost effective, and accurate, but also has the added advantage of being remote and not interfering with construction activities.