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3D Handheld Scanning of Historic Buildings

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Lucion was approached to carry out surveys and create a Revit model to demonstrate the impact of a proposed tram extension on the local area.

Oriel College, with its rich history dating back to the 14th century, stands as a testament to the evolution of academic architecture. The college’s ‘Island Site’, a secluded area accessible through limited entrances, houses a complex network of buildings spanning five storeys and encompassing approximately 200 rooms. These structures, having been expanded and modified over centuries, present a unique challenge in terms of structural assessment and documentation.

The college authorities recognised the need for a comprehensive survey of the ‘Island Site’ to evaluate its physical condition and prepare for future renovations or alterations. This required the creation of detailed floor plans and elevation drawings that would capture not only the basic layout but also the quirks and irregularities that make Oriel College unique. The project aimed to provide a precise digital record of the buildings’ current state, serving as a crucial tool for ongoing maintenance and potential restoration efforts.

12,000m² Area Surveyed

20 Work Days Saved

15mm Accuracy Level

Challenges

  • Time Constraints: As an active academic institution, Oriel College couldn’t afford prolonged disruptions. The survey needed to be completed swiftly to minimise interference with daily operations, especially during the exam period.
  • Complex Architecture: The unconventional layout and intricate network of rooms posed significant challenges for traditional surveying methods. The diverse use of spaces, from lecture halls to student accommodations, added another layer of complexity.
  • Privacy Concerns: With over 500 students and staff occupying the college, the survey method needed to respect privacy, particularly in residential areas.
  • Accuracy Requirements: Despite the time pressure, the survey had to maintain a high level of accuracy to be useful for future structural assessments and renovations.
  • Historical Significance: The historical importance of the buildings demanded a non-invasive approach that wouldn’t risk damaging any part of the structure.
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Solutions

To address these challenges, the project team opted for the GeoSLAM ZEB-REVO, a handheld mobile mapping tool utilising 3D simultaneous location and mapping (SLAM) technology. This innovative solution offered several advantages:

  1. Speed: The ZEB-REVO could record over 43,000 measurement points per second, allowing for rapid data collection.
  2. Accuracy: The technology provided an average accuracy level of 15mm, meeting the project’s precision requirements.
  3. Non-invasive: The scanning process was completely non-contact, ensuring no risk to the historical structures.

The survey was conducted over five days, with 12 individual ZEB-REVO scans completed. Each scan took approximately 30 minutes, covering a total area of 12,000m².

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Successful Project Delivery

The use of advanced 3D SLAM technology resulted in several positive outcomes for Oriel College:

  1. Time Efficiency: The project was completed in 24 days, including 10 days for CAD drawing production. This was less than half the time estimated for traditional static surveying methods.
  2. Minimal Disruption: The speed of the survey process ensured that daily college activities were minimally impacted.
  3. Comprehensive Documentation: The resulting 3D point cloud and CAD drawings provided a detailed and accurate representation of the ‘Island Site’, including all structural irregularities and historical modifications.
  4. Cost-Effectiveness: The reduced time on-site and streamlined data processing led to significant cost savings for the college.

The success of this project demonstrates the immense value of employing cutting-edge technology in heritage conservation. For institutions like Oriel College, such innovative approaches not only save time and resources but also provide unprecedented insights into their historical structures.

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