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。

在剧院下面的地铁上进行的工作可能会进一步降低历史性结构。需要准确的数字状况调查，以帮助当局成功管理未来的翻新甚至完整的重建。

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.

Tuan先生凭借了先前的Leica Geosystems产品的丰富经验，选择了Leica Geosy亚搏彩票手机版下载stems的总站，GNSS和3D Laser扫描仪的机队，以及最新的集成软件，以实现该项目的雄心勃勃的目标亚博5分钟快三。

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.

现有结构的原始空间数据是使用大地设备，相机，无人机和3D激光扫描仪收集的，而技术，历史信息则来自国家档案馆和研究中心。

The second phase involved the modelling and processing of point cloud data to construct a 3D digital representation of the current status of the theatre. Additional information on colours, materials, patterns, as well as details of origin, history and cultural significance were integrated to create a complete BIM model.

第三阶段也是最后一个阶段利用BIM模型来创建精确的3D可视化，可以与利益相关者共享，并使用Leica Truview和Jetstream观看器。

Mr. Tuan said, “The digitalised deliverables could only be achieved with cutting edge equipment and software. Using the resulting BIM model we created a precise reality capture visualisation using VR (Virtual Reality), AR, (Augmented Reality), and MR (Mixed Reality) techniques, ultimately sharing this with stakeholders and the public through an impressive互动虚拟之旅，配备了Saigon Opera House的准确3D型号。”

The extensive Leica Geosystems software portfolio was used in all phases of the project:Leica Infinityfor georeferencing the point cloud data, LeicaCyclone 3DRto 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iCON 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 P503 dlaser scanner into position to capture up to 1km of the area around the opera house in High-Dynamic Range (HDR) imagery and survey-grade quality.

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

Four徕卡RTC3603D激光扫描仪用于柱，雕像，浮雕，图案，吊灯和外部细节。BLK360的光线和紧凑的设计克服了扫描位于密闭阁楼空间中的空调系统的挑战。

“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，”said Mr. Tuan.

无价的投资回报

Confidence in Leica Geosystem’s digital technology amongst Portcoast’s young engineering team has engendered a renewed sense of pride in the history and cultural values the building represents.

图安先生解释说，“In the event of a catastrophe, the entire structure could be rebuilt from the digital record. When necessary in the months and years to come, the digitalised data can also be used to print 3D models needed for high accuracy casting to replicate the original decorative features. Digitalisation has ensured the beauty and majesty of the Saigon Opera House will continue to inspire future generations of residents and visitors to the city.”

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.