How to Leverage Drone-Generated Point Clouds in BIM Software

High-resolution site models aid design and site planning, quality assurance and more

DroneDeploy
Dec 8, 2016 · 6 min read

Virtual design and construction teams are quickly discovering the value that drone mapping brings to all stages of a construction project, including initial site survey and design, volume and elevation measurements and comparisons, and quality assurance. In a fraction of the time it takes to conduct a ground-based survey, a drone can automatically fly and capture imagery of a project site that can then be processed into highly-accurate point clouds compatible with Building Information Modeling (BIM) software.

The VDC team at Brasfield & Gorrie, one of the largest privately-held construction firms in the United States, is setting the standard for the use of drone mapping in construction. Brasfield & Gorrie has equipped each of their regional offices with DJI Inspire series drones and their 24-person VDC team has incorporated drone mapping into their everyday business practices.

Survey-Grade Models Produced in a Fraction of the Time

And project managers don’t need to sacrifice accuracy either. By using ground control points (GCPs), DroneDeploy customers can achieve centimeter-level accuracy. Once the 3D model is complete, DroneDeploy allows VDC teams to export point clouds into local coordinate systems by simply entering a 4-digit EPSG code. The result: survey-grade data in a fraction of the time compared to traditional ground survey methods.

“We saw what was a 2–3 week and several tens of thousands of dollars process become a 1–4 day process with only a couple thousands of dollars invested in equipment and software,” says Cole. “When you’re looking at a dramatic 75% or greater cost and time improvement — it’s really powerful.” [click-to-tweet]

High-Resolution 3D Models Revolutionize the Work of VDC Teams

High-resolution point cloud

The 3D point cloud was so detailed that he could see each powerline over the site and each individual stud in the multifamily apartment complex under construction. In fact, the point clouds his team produces are so detailed, that when he showed one to a colleague recently, it was mistaken for a video.

“I said no, no, this is actually a 3D point cloud, and I can get the volume of any material stockpile on that site, I can make any linear measurement — so this is a really detailed point cloud that showcases the quality of data you can get.” — Hunter Cole

Integrating Drone Point Clouds in BIM Enables Powerful Analysis

  • initial site survey and design
  • quality assurance- comparing actual construction against plans
  • measuring and comparing changes over time

The Autodesk app within the DroneDeploy interface makes it easy to send point clouds directly to your Autodesk Forge account.

Below are a few examples of how Brasfield & Gorrie is leverages point cloud data in BIM software to make better decisions.

Site Planning

Fly-through of the combined point cloud, design

Monitoring Earthwork

Heat map comparing earthwork to site plans. Green indicates elevations match design plans, blue indicates elevations too low, red indicates elevations too high

During construction of a 61-acre hospital site in Florida, the Brasfield & Gorrie team used a drone-generated 3D point cloud to help a site manager compare a subcontractor’s initial earthwork with site plans. Because the site manager was concerned that the subcontractor had not exported enough soil, accuracy and timeliness were key.

The final output was a heat map showing the external contractor’s earthwork progress compared to the initial plans, and the site manager was able to conclude that the subcontractor did need to export more soils to reach the correct elevations.

Verifying Concrete and Pipe Work

VDC teams can even overlay existing design models on top of drone-generated point clouds depicting site conditions.

In this example, Brasfield & Gorrie overlaid the design model for this processing plant on top of the 3D model of the site conditions to verify that concrete footings and pipes had been put in the right place.

“I can overlay a point cloud over that 3D model, line it up exactly and see, for the first time, what’s been built versus the design intent,” says VDC Coordinator Hunter Cole.

Where to Learn More

For more detailed documentation on support export formats and how to import drone-based data into BIM software, check out the following resources in our support center:

Start Mapping with DroneDeploy

DroneDeploy's Blog

DroneDeploy is the leading cloud software platform for…

DroneDeploy's Blog

DroneDeploy is the leading cloud software platform for commercial drones. Learn more at www.dronedeploy.com

DroneDeploy

Written by

DroneDeploy is the leading cloud software platform for commercial drones.

DroneDeploy's Blog

DroneDeploy is the leading cloud software platform for commercial drones. Learn more at www.dronedeploy.com