I-4 Beyond Ultimate Design-Build Laser Scanning

DRMP was selected to provide surveys of obscured areas under the I-4 bridges from south of the St. Johns River bridge to the SR 472 Bridge in Volusia County, Florida. The major challenge of this project was how to collect accurate survey data under the I-4 bridge over the St. Johns River, a bridge consisting of two spans of approximately 1,200-feet each, with bridge elements not safely accessible from the ground.

Using terrestrial LiDAR scanning (3D laser scanning), DRMP’s staff surveyed the bridges from the existing pier foundations in the St. Johns River. A baseline of control was established using GPS and traditional methods, and the resulting control points were then used to register scan point clouds collected from the piers.

3D linework was extracted for each bridge element using TopoDOT extraction software, resulting in the data collected quickly and accurately while ensuring the safety of survey crews.