Project Objectives

• Capture the complete architectural condition of both interior and exterior spaces of the cathedral.
• Generate a high-density 3D point cloud with millimeter-level detail.
• Deliver standardized datasets for conservation, research, and restoration.
• Provide long-term archival data in international formats, compatible with BIM systems and web-based 3D visualization.

Equipment & Methodology

Equipment – Z+F Imager 5016

The Z+F Imager 5016 is a high-end terrestrial laser scanner (TLS) with a range of up to 360 m and an accuracy of ±1 mm, equipped with HDR true-color imaging. It is particularly suitable for documenting heritage structures with complex details and large vertical extents such as St. Joseph’s Cathedral.

High-resolution capture of ornamental details

Scanning & Processing Workflow

• Established multiple scan stations across exterior, nave, aisles, staircases, domes, and bell towers.
• Applied cloud-to-cloud registration combined with sphere targets to enhance accuracy.
• Processed and standardized point cloud data, including noise filtering, color balancing, and export to international formats.

Deliverables

• High-quality point cloud in LAS, E57, RCP formats with ±2 mm accuracy.
• True-color dataset captured using HDR imaging from the Z+F 5016 scanner.
• Structured dataset organized by zones: exterior, nave, roof vaults, bell towers, etc.
• Original project files (ZFS format), including file structure documentation and usage guidelines.
• Data ready for BIM modeling, architectural drawings, or web-based visualization via Cesium/Potree.

Point cloud dataset captured from laser scanning

Applications & Significance

• Digitally preserves St. Joseph’s Cathedral with high-precision 3D data for long-term conservation and restoration.
• Supports architects, conservation specialists, and restoration experts with accurate technical documentation.
• Enables public engagement through online 3D visualization of Gothic architectural heritage.
• Serves as a reference model for digitizing other Catholic heritage sites in Vietnam.

Frequently Asked Questions (FAQ)