14 Best Practices in Scan to BIM
Scan to BIM
Scan to BIM Process
let us first understand the Process. Scan to BIM is essentially composed to three stages:
- On-Site Scanning
- Registering & Combining Raw Scans
- BIM Modeling
- On-Site Laser Scanning using Laser ScanningCameraLaser Scanning is done on site using special cameras. This could be done in Black & White or Color. Color Scans are clearer and are relatively easier to Model accurately.
- Registering Raw Laser ScansRaw Laser Scans need to be processed. There are typically multiple scans for a large facility. These multiple scans need to be combined using software such as Autodesk Recap Pro.
- Converting Registered Laser Scans to BIMAfter processing Raw Laser Scans, they can be imported in BIM enabled software such as Autodesk Revit. Be sure, you understand the Scope of work and LOD required for deliverables
This is the starting point of your Project
- Define Scope of Work and level of DetailIt is critical that the scope of Wok is clearly and precisely defined for the Project.
- Define the Scanning Process and methodologyDefine methodology to be adopted before sending in field staff.
- Use High-Quality ScannersUse High-Quality Scanners can produce point-cloud density needed for the specifications and LOD needed. High-Density Color Point Cloud Data is critical for high accuracy. Scan to BIM Model and can help you save. This is because of clarity in data, helps reduce Modeling time and as a result lower cost.
- Plan your scanning Process.
Identify Camera Positions and ensure Circles of each Camera overlap
- Support Point Cloud Data with Photographs and 360 Walkthroughs
.Thishelps modelers understand space and elements that are unclear in Point Cloud
- Field Notes can help in accuracy.Not all information is clear in Scan data, Field Notes take a higher priority over Point Cloud and result in a more accurate BIM Model
Each Project will have multiple scans in order to scan a Building or an Interior space. Autodesk Recap Pro can take this raw data and automatically register the raw data.
- Number the scans sequentially.Number raw scans sequentially. This helps in aligning scans properly.
This is the final step in Scan to BIM process. Now that you have Scan data. Import it into Revit. The following steps will be helpful in accurately modeling from Point Cloud.
- Check out Scope of work and LODVery often BIM Model produced does not match the required Scope or level of Detail that is required for your BIM Model. It is therefore important that every member of your team clearly understands this.
- Establish Survey pointIdentify and establish Survey Points if available in your scan Data and use them to establish these in your BIM Model
- Pin your Point-CloudOnce your Point Cloud is in Revit, Pin it so that it does not move by mistake
- Setup Levels.When you import Point Cloud, you will need to establish levels. Your level 1 Plan may not show anything. Use 3D Elevation Views to establish levels.
- Adjust View Depths
.Withoutadjusting View Depths, you may see a huge amount of Points and these may become confusing
- Cross check your
modelCrosscheck your model against Photographs Field Notes and 360 Walkthrough.
- Use NavisworksIf 360 Walkthrough is unavailable, use Navisworks walkthrough