LASER SCANNING FOR BUILDINGS
3D SCANNING
Digitising and modelling your building with the 3D SCANNER.
What is a 3D scan ?
It is a tool that scans large indoor and outside spaces in 3D and produces a « point cloud ».
The point cloud is used as a basis for a digital model.
3D scanners are increasingly high-performance and are now becoming more easily accessible to companies.
3D scanning for surveys…
A digital model created using 3D scanning is far superior, in terms of quality and precision, to 2D surveys. It makes it possible to visualise the project from the inside and verify every detail.
The different modelling steps.
1.
Assessment of the area to scan
The site has to be assessed to estimate the time required for the surveys and to choose the type of scan. It is necessary to take the height of the building, any false ceilings, racks, obstructions, etc. into account.
2.
Carry out the scan
The site is digitised « station by station » using a scanner. Each station is a set position where a static scanner (mounted on a tripod) scans the environment over approximately 320°. Dynamic scanners, on the other hand, scan the surroundings while moving. Their sensors emit a beam of light that scans the environment horizontally and vertically until it encounters an obstacle. The distance to each obstacle is then measured and the position is mapped with a point. The accuracy and range of the scanner depends on the chosen configuration.
3.
Processing the point cloud
A point cloud is generated for each station, so it represents a defined area of the building. Next, all the point clouds need to be “reconstructed” and “meshed” to form a single cloud. This requires identifying common targets on several point clouds. Point clouds from static and dynamic scans can be reconstructed together. It is also possible to isolate horizontal and vertical sections in the cloud, in order to create cross-sections, profiles or 2D views. These cross-sections can be used to draw different 2D geometries using software such as AutoCad. This provides reliable data and reduces the number of return trips to the site.
Il s’agit d’une base fiable extrait de la réalité et cela permet de réduire les aller-retours sur le site.
4.
Producing a digital model
Scan to BIM consists of using the point cloud as a template to create the 3D/BIM model of a building, with a specific software such as Revit. This method creates a more accurate model of a building, based on an imprint of the actual building. It is particularly reliable for creating an « as-built » model of the building. The model is checked using a Navisworks viewer, where the point cloud is inserted into the existing digital model. It is then possible to detect the difference between the two, i.e., the reality, and the geometric model we are aiming for. This method has a number of advantages such as being able to update the digital design model as the site progresses and detecting potential issues in time to avoid additional costs.
Static scanner
The most commonly used scanner.
It is used with a tripod and has several levels of precision.
Each position corresponds to a “station” from which a point cloud is generated.
This type of scan is generally more precise but takes longer due to the waiting time at each station.
Point cloud
Data is collected as a “point cloud”.
Each point cloud corresponds to a scan position.
The point cloud is used to create a digital model.
Dynamic scanner
This technology is more recent and extremely practical in difficult-to-access areas.
It is quicker to do than a static scan.
However, it provides slightly less precision.
Digital model
A 3D geometrical computer representation of the inside and/or outside of a building.
Dynamic scanner
This technology is more recent and extremely practical in difficult-to-access areas.
It is quicker to do than a static scan.
However, it provides slightly less precision.
Point cloud
Data is collected as a “point cloud”.
Each point cloud corresponds to a scan position.
The point cloud is used to create a digital model.
Static scanner
The most commonly used scanner.
It is used with a tripod and has several levels of precision.
Each position corresponds to a “station” from which a point cloud is generated.
This type of scan is generally more precise but takes longer due to the waiting time at each station.
Digital model
A 3D geometrical computer representation of the inside and/or outside of a building.
The advantages of 3D scanning
3D scanning makes it possible to :
- save time on surveys compared to traditional surveys,
- scan areas that are difficult or dangerous to access,
- obtain comprehensive, accurate, and reliable data right at the start of the project.
FIRE-PROTECTION
PROJECT MANAGEMENT INCLUDING PRELIMINARY SURVEYS AND PROJECT PLANS
FIRE-PROTECTION IMPLEMENTATION STUDIES
Your contact NENYO for 3D Scanning
Arnaud
Scan Department Manager
Arnaud spent 28 years on work sites, including 6 years as a team leader in Spain! In 2019, he embarked on a 10-month professional retraining program to become a designer-draftsman. He joined NENYO in 2020.
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Fire-protection surveys - AMO - SCAN 3D