GdB offers the following Construction Survey Services in addition to traditional Land Surveying Services:

Construction Layout
3D Machine Control Modeling
Construction Monitoring
Slipform Curb Modeling
Pavement Scanning and Profiling
Earthwork Take-Offs

Contact our Trusted Expert!

Justin Roloson, LS – Survey Project Manager

21 Years of Experience

Justin joined the GdB team to assist in developing our new branch office in Honeoye Falls, NY. As a Machine Control Modeling expert, Justin’s previous work in the construction survey field has already proven to be an invaluable asset to the organization. We look to his extensive experience as a project manager to train our staff and launch our expanding services providing excellent results.

Project Highlights

Erie Canal Lift Bridge Rehabilitation (D264615)

NYS Rt. 31 State Street Bridge Rehabilitation (D264306)

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New York State Department of Transportation

Erie Canal Lift Bridge Rehabilitation (D264615)
Town of Avon, Livingston County, NY

To assist with a rehabilitation effort on NYS Routes 19 and 98 in the town of Albion and Brockport, GdB Geospatial was hired to complete a laser scan of the existing steel bridges and deliver a point cloud for use in steel manufacturing and fabrication

GdB began with a full review of the provided contract plans and design CAD files. On site, GdB field crews recovered and verified the existing contract survey control and benchmarks. Additional survey control and benchmarks were established for layout and monitoring use throughout the project timeline. Utilizing stationary LiDAR, GdB field crews laser scanned the critical bridge apparatus including existing abutments, bridge camber, concrete walls, concrete pits, lifting machinery frames, and the upper and lower chords.

The resulting 3D Point Cloud of the scanned data, and a scan report, was generated to show residuals and overall cloud accuracy. Critical points were identified and located using a total station, these points were marked for identification and will be monitored throughout the course of construction.

Post-demolition of the Erie Canal Lift Bridge, GdB completed an additional laser scan for use for use in verify fit and placement of design components. C A Point Cloud was prepared with the scanned data, alongside an accuracy report and comparison information for the contractor.

For the Fabrication phase of this project, GdB scanned roughly 25 lifting components in the contractor’s warehouse, per bridge. Critical points that were identified during the initial scan were used as reference points in point cloud extraction and comparisons. An accuracy report of the scanned data was provided to the contractor, alongside the processed point cloud in the contractor’s preferred format for use in their fabrication software. This enables the manufacturer to fabricate the parts and assemble in house ensuring proper fit prior to installation onsite.

Conventional survey methods were used to provide layout of construction alignments, critical points captured during scanning, as well as miscellaneous features such as the sidewalk, curbing, and pavement as needed throughout construction.

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New York State Department of Transportation

NYS Rt. 31 State Street Bridge Rehabilitation (D264306)
Pittsford, New York

To assist with a rehabilitation effort on the State street bridge on NYS Route 31 in the town of Pittsford, NY, GdB Geospatial was hired to provide a laser scan and point cloud throughout multiple phases of the project.

GdB began with a full review of the provided contract plans and design CAD files. On site, GdB field crews recovered and verified the existing contract survey control and benchmarks. Additional survey control and benchmarks were established to ensure accuracy of the resultant survey. To complete the laser scan of the bridge, six semi-permanent targets were first placed at strategic locations to monitor the bridge during the demolition and reconstruction phase of the project. Utilizing stationary LiDAR, the top of deck and underside of the bridge were scanned, covering all visible components including stringer, flood beams, and low chord. A 3D Point Cloud was prepared from the resulting scan data, including the monitoring targets, for use by the contractor.

From the resulting point cloud of the bridge, GdB extracted a CAD file which included all critical line work, structural features, dimensions and any additional planimetric and structural features requested by the contractor. This CAD file was delivered in the client’s preferred format.

Post-demolition of the State Street Bridge, GdB completed an additional laser scan of the exposed bridge stringers, floor beams, and monitoring targets that were previously established on site. Utilizing the resultant point cloud, GdB extracted critical points for monitoring throughout reconstruction. These critical points were organized into an Excel table for comparison throughout reconstruction.

Once the State Street Bridge construction was complete, GdB returned to the project site to complete an as-built of the deck and underside of the bridge covering all critical components. This was also accomplished utilizing Stationary LiDAR.