Heritage-BIM model to future proof an Opera House

Author:Hazlinda Mohd Nuron

Saigon Opera House是Ho Chi Minh City最优雅和历史文化资产之一，具有新的数字身份，可管理，保存和保护这座标志性的建筑。

由建筑师尤金·弗雷特（Eugene Ferret）建于1898年，并以巴黎的小宫殿为蓝本，这座备受喜爱的市政表演艺术场所也是传统的旅游景点。由于其位于越南南部繁忙的城市中心，该建筑被确定为处于危险之中。

Work carried out on the Metro beneath the theatre might further degrade the historic structure. Accurate digital condition surveys were needed to help the authorities successfully manage future renovations or even a complete reconstruction.

News of the fire that almost destroyed Notre Dame Cathedral in Paris gave the project an added impetus.

The General Director of Vietnam’s Portcoast Consultant Corporation, Mr Pham Anh Tuan, took responsibility for the work, assembling a 30-strong survey and engineering team to tackle it.

With vast previous experience of Leica Geosystems products, Mr Tuan chose a fleet of Leica Geosystems’ total stations, GNSS and 3D laser scanners, together with the latest integrated software, to deliver the project’s ambitious goals.

一种三步的方法

The first phase of work was to construct a base heritage-BIM model. As the original design documents and structural drawings had been lost over time, two data sets from different sources were required.

佤族原始空间数据现有的结构s collected using geodetic equipment, cameras, UAV and 3D laser scanners, while the technical, historical information was sourced from national archives and research centres.

第二阶段涉及点云数据的建模和处理来构建剧院当前状态的3D数字表示。集成了有关颜色，材料，图案以及来源，历史和文化意义的详细信息的其他信息，以创建完整的BIM模型。

The third and final phase utilised the BIM model to create a precise 3D visualisation, which could be shared with stakeholders, usingLeica TruView和Jetstream观看器。

Mr. Tuan said, “只有使用尖端设备和软件才能实现数字化交付成果。使用由此产生的BIM模型，我们使用VR（虚拟现实），AR，（增强现实）和MR（混合现实）技术创建了一个bob综合app赌博精确的现实捕获可视化，最终通过令人印象深刻的是与利益相关者和公众分享这一点互动虚拟之旅，featuring an accurate 3D model of the Saigon Opera House.”

The extensive Leica Geosystems software portfolio was used in all phases of the project:Leica Infinityfor georeferencing the point cloud data, Leica气旋博士3to create the digital model of the statues and reliefs and the LeicaCloudworx插件进行修订，以将顶部车顶框架系统添加到BIM型号中。

捕获内外现实

Using aLeica Nova TS60，二GNSS GS18 t， 一图标ICR80和两个图标GPS70，the survey team set up over 350 georeferenced scanning stations to accurately capture point cloud data, from the stage and auditorium to the roof dome, basement, and outer walls.

由于无法物理爬上屋顶，因此使用起重机来抬起Leica ScanStation P503D激光扫描仪可以捕获高动力范围（HDR）图像和测量级质量的歌剧院周围地区多达1公里的区域。

For the complex interior geometry, particularly in the narrow attic and basement spaces, where fast scanning time, accuracy, stability and manoeuvrability were essential, theLeica RTC360和Leica BLK360是理想的。

FourLeica RTC3603D laser scanners were used for the columns, statues, reliefs, patterns, chandeliers and exterior details. The light and compact design of the BLK360 overcame the challenge of scanning the air-conditioning system located in the confined attic space.

“测量的准确性和测量点的密度是我们选择硬件的关键因素。该设备的高效率，灵活性和可靠性为我们节省了项目的各个方面的时间和人力，从初始控制和地理发射到激光扫描和注册过程，”图安先生说。

A priceless return on investment

Portcoast的年轻工程团队对Leica Geosystem的数字技术充满信心，这对建筑物所代表的历史和文化价值观产生了新的自豪感。

图安先生解释说，“如果发生灾难，可以从数字记录中重建整个结构。在未来几个月和几年的必要时，数字化数据也可用于打印高精度铸造所需的3D型号，以复制原始的装饰功能。数字化确保了西贡歌剧院的美丽和威严将继续激发后代的居民和城市的游客。”

Following the success of this heritage project, the municipal authorities now have scope to consider applying digital documentation methods to some 150 buildings of historical, cultural and artistic significance in Ho Chi Minh City.