II级*列出的历史建筑的完整激光扫描调查

作者：汤姆·惠特克罗夫特（Tom Wheatcroft Ba）（荣誉）, Architectural Technologist / Geospatial Surveyor

岭和合作伙伴LLPis a multidiscipline Property and Construction Consultancy with over 650 employees working worldwide from 11 offices across the United Kingdom. In September 2019, their Geospatial team were commissioned by Oxford City Council to undertake a full laser scan survey and produce a Revit 3D Model of the Oxford Town Hall, a Grade II* listed building in the centre of Oxford. Completed in 1897, Oxford Town Hall is both the venue for public meetings, entertainment, events and the seat of Oxford City Council.

使用Autodesk Revit，即生产高质量3D建筑设计和文档的BIM（建筑信息建模）软件，专业Ridge团队创建了3D模型，以整合30年计划的维护报告和状况调查中的信息。该项目期间面临一些关键的挑战，主要围绕正在处理的数据量进行旋转。由于市政厅是一栋大型的历史建筑（7层，约18,000平方米），因此需要大量细节，因此需要从各种扫描仪进行1800多个颜色扫描以注册成完整的点云。

市议会需要一份准确的报告和有关建筑物当前布局的数据，因为它们的大量信息已过时或不准确。包括设施团队在内的每个人，以及现有的3D BIM就绪模型，应将条件和维护信息集成并易于访问，以进行资产维护，设计团队可以将其用于任何未来计划的工作。

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

结果是准确颜色poi注册nt cloud of the Oxford Town Hall which could be published in an Autodesk Recap format along with viewing capabilities for the client, usingLeica Jetstream。然后将使用点云来生成建筑物的准确且高度详细的3D修订BIM就绪模型，包括条件和维护信息。

Equipment Ridge and Partners LLP used on this project:

• Leica Scanstation P40

• 2 xLeica RTC360 3D激光扫描仪

• Leica Viva GS16 GNSS smart antenna

• Leica Viva TS16总站

Ridge established a long term relationship withSCCSSurvey Equipment, who were chosen to provide the surveying equipment, through hire and sale due to their excellent customer service, reliability and technical support. A ScanStation P40, a high-definition 3D laser scanner was used because of its increased range and accuracy. This performance provided highly detailed controlled data capture for external elevations and across roof areas. The scanner was also used to traverse through the building from front to back and from the roof to ground floor, giving an accurately constrained control loop. Due to its efficiency, an RTC360 3D laser scanner was also employed to be used on internal offices, meeting rooms and function spaces, which was scanned quickly and accurately in full colour. The onboard Visual Inertial System (VIS) technology andLeica Cyclone FIELD 360mobile-device app saved processing time when the data made its way back to the office, meaning it could be exported to the modelling team quicker. It also allowed Ridge to asset tag mechanical and electrical assets in the field to be included in the Jetstream file.

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和徕卡气旋注册360, to then output as E57 files to bring into Autodesk Recap.

Tom Wheatcroft BA(Hons), 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".