Michael Gallie & Partners have over 50 years of expertise in carrying out measured building surveys and over the last 5-10 years specialised in providing point cloud to BIM surveys. Below is an outline guide of our process.
Transforming Raw Data into Precise Building Models
- Access & RAMS
Ensuring unhindered access to every nook and cranny of a building is paramount for Michael Gallie & Partners. When we’re tasked with surveying active buildings, clients receive a detailed timetable indicating the time required for each floor. This way, logistics and access schedules can be planned effortlessly. Additionally, a comprehensive Risk Assessment & Method Statement (RAMS) is issued well before any on-site surveying starts.
- Survey Control Framework & Grid/Datum Setup
The core of our BIM processes, especially when translating point clouds, hinges on a meticulously constructed survey control framework. To align the survey with the official Ordnance Survey grid, our surveyors employ two high-precision GPS devices, that operate simultaneously for a minimum period of two hours.
- Laser Scanning
Every BIM project at Michael Gallie & Partners pivots around cutting-edge laser scanning. Each segment of a building undergoes rigorous scanning, ensuring no blind spots. Typically, a laser scanner, stationed on a sturdy tripod, captures data from multiple vantage points, dedicating 1-2 minutes per location. Occasionally, for specific surveys, we might utilise handheld laser scanners, providing swifter, albeit slightly less accurate data. Should you seek a vivid, colour-detailed point cloud, note that each scanning session extends by a minute.
- Office Processing to Produce Point Cloud
Back in the office, this raw laser scan data undergoes a transformation. Utilising specialist software and high-end computing power, we align and process these scans to their corresponding site grids. Post verification, this collated point cloud is segmented, floor-wise, priming it for modelling. Where nuances matter, we can create HDR visuals or immersive point clouds, leading to an interactive TrueView representation. This digital tool, offering 360° panoramic snapshots, became an invaluable asset for our clients during the pandemic-induced lockdowns.
- BIM Production
The processed point cloud breathes life when introduced to BIM software like Revit. Our modellers, working in harmony, sculpt these digital renditions, using a centralised model to evade errors. Typically, different modellers work on separate floors, regularly syncing their work with the mainframe, ensuring consistency.
- Client Issue
BIM outputs are made accessible to clients via direct weblink downloads. Alongside these intricate 3D models, clients receive a drawing register, detailing model specifics, version histories, release dates, and recipient lists.
From the primary access stages to delivering the final BIM model, Michael Gallie & Partners ensures an uncompromised commitment to accuracy and client satisfaction.
All point cloud to BIM deliverables are issued to the client via a weblink download. All 3D models issued are accompanied by a drawing register which indicates the model issued, versioning, date of issue and people issued.
If you need any advice on commissioning a point cloud to BIM survey, please contact Sam Lloyd at Michael Gallie & Partners who will be happy to assist you in this matter.
Frequently Asked Questions (FAQs)
- What is the significance of RAMS in the BIM process? RAMS ensures the safety of all stakeholders during the on-site surveying phase.
- How does the Ordnance Survey grid assist in BIM? It provides a standardised reference, ensuring accuracy and consistency in surveying and modelling.
- What’s the advantage of laser scanning in BIM? Laser scanning offers high-resolution, detailed data capture, ensuring comprehensive and accurate building models.
- Can you explain TrueView in simpler terms? TrueView offers an interactive digital walkthrough using panoramic images from the laser scanner, letting users virtually navigate the site.
- How do clients access the final BIM models? Clients can easily download the models via a provided weblink, ensuring easy accessibility and sharing.