LiDAR (3D Laser Scanning)
Instead of holding a prism at every point we need to measure, LIDAR sensors spray light beams to all objects in its field of view to collect point data at a desired interval (as little as every few millimeters). This creates a point cloud with xyz measurements on every point in the cloud. The point clouds are reconciled with digital photos, and the result is a color 3D model of the project site. We can then choose from a variety of renderings and choose which points and linework will be added to CAD drawings and DTM’s.
161 Maiden Lane
USTA National Tennis Stadium
161 Maiden Lane – 58 Story Wall Scan
Gayron de Bruin Land Surveying and Engineering, PC performed 3D Laser Scanning services of a 58-story building under construction at 161 Maiden Lane, New York, NY.
Four independent control networks were set, each relating to a different side of the building to determine if the building was leaning. Independent scans were performed on the full extent of the building in question on rooftops where the building was visible as well as from the streets in the immediate vicinity. GdB utilized a Leica P50 3D Laser Scanner to perform this detailed work.
Deliverables included the registered point cloud and an AutoCAD 3D file containing polylines representing the perimeter of each of the 58 floor slabs. The CAD file also included offset dimensions on all faces of each floor.
This project was delivered on time and within budget.
Drainage Improvements and Road Raising
Gayron de Bruin Land Surveying and Engineering, PC was hired as a subconsultant to perform surveying and mapping services to Town of Hempstead specifications which included topographic, boundary and subsurface utility mapping as well as storm water and sanitary structure investigations within the specified project scope.
Following Town of Hempstead surveying and mapping standards, elevations were taken at 25’ cross sections for roughly 4,675 linear feet of roadway. All planimetric features and topography was mapped up to the face of the houses, which included house corners, first floor elevations, garage floors, top and bottom of entry way steps, window wells and planting areas as well as any and all features that may be impacted by regrading and raising the road. GdB used a combination of traditional ground survey and terrestrial LiDAR to optimize our time spent on this task.
Property lines were set for all parcels using maps, deeds and surveys of record. Fifteen properties were identified by the project owner for production of easement maps which were signed and sealed by a NYS Licensed Land Surveyor.
Record research was performed at various utility providers and local municipalities. Field investigations of storm water and sanitary structures were made to reconcile and update archived record plans.
All work was delivered on time and within budget, without any safety issues.
USTA National Tennis Stadium
Flushing Meadows Park
The GdB team has been providing surveying services at the National Tennis Stadium since 1999. This facility is constantly being upgraded and improved. The USTA relies on GdB to get out to the site on short notice several time per year. We have provided topographic mapping for designs of tennis courts, buildings, utilities, concession areas, parking lots, and for master planning. We also provide as-built surveys to keep the site mapping up to date after all construction projects. We provided a boundary survey of the USTA’s lease lines to facilitate master planning and site expansion. We use our 3D laser scanner often to capture detailed data of the site facilities. One of our most recent assignments was to survey structural supports for replacement of the existing main display scoreboards, and for installation of new HD video boards around the perimeter of the octagon.