The full laser scan survey of a Grade II* Listed historic building

Author: Tom Wheatcroft BA(Hons), Architectural Technologist / Geospatial Surveyor

岭和合作伙伴LLP是一家多学科的物业和建筑咨询公司，全球有650多名员工在英国的11个办事处工作。2019年9月，牛津市议会委托他们的地理空间团队进行了完整的激光扫描调查，并制作了牛津市政厅的Revit 3D模型，牛津市政厅是牛津市中心列出的II级建筑。牛津市政厅于1897年完成，既是公开会议，娱乐，活动和牛津市议会所在地的场所。

Using Autodesk Revit, a BIM (Building Information Modelling) software that produces high-quality 3D architectural designs and documentation, the specialist Ridge team created a 3D model to integrate information from a 30-year planned maintenance report and condition survey. There were some key challenges faced during the project which predominantly revolved around the amount of data being processed. As the town hall is a large historic building (7 floors, approximately 18,000m²) with a great deal of detail, more than 1800 colour scans from various scanners were needed to register into a complete point cloud.

The city council required an accurate report and data on the current layout of the building, as much of their information was either outdated or inaccurate. The condition and maintenance information was to be integrated and easily accessible for asset maintenance by everyone, including the facilities team, and also an existing 3D BIM-ready model which could be used by design teams for any future planned work.

Full-colour external and internal point clouds of Oxford Town Hall created using a Leica ScanStation P40 and RTC360 laser scanners, supplied by SCCS.

结果是牛津市政厅的准确注册的色点云，可以以Autodesk recap格式出版，并为客户观看功能，并使用Leica Jetstream. The point cloud would then be used to produce an accurate and highly detailed 3D Revit BIM-ready model of the building, including the condition and maintenance information.

设备岭和合作伙伴有限责任公司用于此项目：

• Leica Scanstation P40

• 2 xLeica RTC360 3D laser scanners

• Leica Viva GS16 GNSS smart antenna

• Leica Viva TS16 total station

岭与SCCS由于其出色的客户服务，可靠性和技术支持，因此被选为通过雇用和销售而被选为提供测量设备的测量设备。使用扫描仪P40，是由于其范围和准确性增加而使用了高清3D激光扫描仪。该性能为外部高程和整个屋顶区域提供了高度详细的受控数据捕获。该扫描仪还用于从前到后，从屋顶到一楼穿过建筑物，从而获得了准确的控制环。由于其效率，RTC360 3D激光扫描仪还被用于内部办公室，会议室和功能空间，以全彩色快速准确地扫描。车载视觉惯性系统（VIS）技术和Leica Cyclone Field 360当数据返回办公室时，移动设备应用程序节省了处理时间，这意味着可以更快地将其导出到建模团队。它还允许Ridge资产标签机械和电气资产中的电源和电气资产包含在Jetstream文件中。

With the use of a GS16 GNSS smart antenna, the Ridge team recorded a minimum of two control points to orientate the scan data to OS, and a TS16 total station provided orientation over control points gathered by the GPS and used to set up a control network. The TS16 was also used to pick targets to register the laser scan data. At the end of the survey, the captured raw scan data from both scanners were then processed inLeica Cyclone 3dr和Leica Cyclone寄存器360，然后作为E57文件输出以将其带入Autodesk recap。

汤姆Wheatcroft学士(荣誉),Architectural Technologist / Geospatial Surveyor commented, "I would highly recommend SCCS Survey Equipment who provided all of the equipment when we needed with it, with technical support on-site and in the office to help when processing data, which is invaluable on a project of this scale".