High Accuracy BIM Capture with the Leica ScanStation P20

Murphy Surveys were invited by CITA to carry out a detailed Laser Scan Survey of the Guinness Storehouse and produce an accurate and high level of detail as-built Building Information Model (BIM), as part of the International CITA BIM Gathering Event.
The CITA BIM Gathering was a unique conference which brought together the global leaders in BIM.
Following a site visit and examination of CITA’s survey requirements, Murphy Surveys determined the most suitable survey methodology was to deploy their Leica ScanStation P20 laser scanner. The Leica P20’s Ultra Fast speed (up to 1 million points/second) and high quality data capture is the industry’s best technology for the survey of the as-built environment.
High-Definition Laser Scanning (HDS) fully captured the site conditions, providing the required survey data to produce the Autodesk Revit Building Information Model (BIM). On-site survey control was achieved with the Leica TS30 Viva Series. The High-Definition Point Cloud was processed in Leica Cyclone 8 which produced a unified point cloud to an accuracy of +/- 5mm. The final point cloud was geo-referenced to Irish National Grid Coordinates.
The High-Definition data captured was checked and put through Murphy Surveys Quality Assurance (QA) procedure and the experienced in-house Survey technicians prepared the point cloud data for the BIM Team to create the Building Information Model.
The Building Information Model was created using Leica CloudWorx for Revit, a breakthrough plug-in for efficiently using rich as-built point cloud data captured by the Leica ScanStation P20 laser scanner, directly within Revit for better BIM modelling of existing buildings.
Individual as-built Families were created for each modelled feature in Autodesk Revit 2013. Contained within each Family was an Asset Tag so that these Assets could later be linked to Murphy Surveys Asset and Lifecycle Management solution called Amtech ArtrA. The added meta information allows clients to derive more functionality and ROI from the High-Definition Survey and Building Information Model.
On completion, the extracted as-built BIM Revit 2013 model was verified against the High-Definition Point Cloud to ensure consistency and accuracy. The Final Model was verified to an accuracy of +/- 5mm. The project was delivered within the required project time frame with all deliverables meeting the project specification in terms of accuracy, completeness and client expectation.

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