Existing Condition Laser Scanning for Renovation – Sen Hong Primary School, District 2

3DScan.vn carried out a 3D laser scanning survey of existing conditions at Sen Hong Primary School, supporting renovation and repair works. The project covered an area of 2,500 m², including classrooms, corridors, and all external areas. Data acquisition and initial processing were completed within 1 day, achieving an accuracy of ±10 mm and BIM modeling at LOD 250.

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1. Objectives and Scope

The objective of this project was to capture the full existing condition of Sen Hong Primary School to support renovation design, facility upgrades, and additional construction works. The application of 3D laser scanning enabled accurate and detailed data capture of walls, floors, roofs, and structural elements, ensuring that the BIM model reflects real-world conditions.

• Location: Sen Hong Primary School.
• Survey area: 2,500 m² including classrooms, corridors, playground, and auxiliary areas.
• Duration: 1 day (including scanning, preliminary processing, and registration).
• Accuracy: ±10 mm in VN-2000 coordinate system.
• Modeling level: BIM LOD 250 – including architectural elements such as walls, columns, floors, and roofs.

2. Workflow

The project was executed using a high-speed 3D laser scanner, capturing data continuously from indoor to outdoor spaces to maintain spatial consistency. The Cloud-to-Cloud registration method was applied for fast alignment, with error control maintained below 10 mm.

• Site inspection and planning of scan paths with optimized station placement.
• Full scanning of classrooms, corridors, playground, and auxiliary areas within one day.
• Registration using ICP algorithm, including noise filtering and alignment refinement.
• Export of standardized point cloud data (E57, RCP) and development of BIM LOD 250 model.

3. Results and Applications

The resulting point cloud dataset provided full spatial coverage with an average deviation of ±10 mm. The BIM LOD 250 model enables designers and facility managers to accurately identify structural elements, walls, openings, and existing MEP systems, helping to reduce design conflicts and accelerate renovation processes.

Conclusion

The application of 3D laser scanning technology in existing-condition surveys provides significant advantages in accuracy, speed, and spatial analysis. The Sen Hong Primary School project demonstrates 3DScan.vn’s capability in delivering Scan-to-BIM solutions for renovation, repair, and facility management in educational infrastructure.

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