用GNSS漫游者测量点云
Takeaways from JTRS Registered Surveyor on the Leica GS18 I GNSS RTK Rover
Author: Renata Barradas
We measure the point cloud.
This is the slogan from JTRS Registered Surveyor, a professional land surveying company in Singapore that provides 3D laser scanning, land survey, aerial mapping and inspection, photogrammetry and imaging services. JTRS is continuously looking for innovative and creative ways to improve the surveying services the company provides.
The company's latest technology leap is being able to measure the georeferenced point cloud and points with its brand new tech acquisition – theLeica GS18 iGNSS RTK Rover.
"The capability of capturing images at the same time with real-time positioning from a single instrument, really changes the way we carry out surveying – It's a reality capture concept,"JTRS的所有者Jimmy Tan解释说。
此外，借助随之而来的倾斜补偿，它有助于获得RTK观察并迅速进行记录，这在夜间工作时像我们必须在机场跑道或MRT高架桥一样有用。我不需要额外的双手来握住手电筒在我平整杆子时发光的泡沫。”
除了测量点云外，GS18我还用功能强大的RTK漫游器授权JTR，结合了快速的RTK初始化，倾斜补偿的测量和视觉定位，这都是一个工具。借助GS18，我添加了他们的投资组合，JTRS能够提供新服务并改善公司的当前服务。
防弹工作流程
JTRS mostly uses the GS18 I for control surveys and quality checks in utility and construction projects. The tight accuracies needed range from 50mm to 100mm and for most QC projects within 40mm. For each project, the workflow with this versatile RTK GNSS rover is:
- 使用GS18 I和Leica Captivate现场软件
- 使用办公软件的数据处理Leica Infinity
- Creating deliverables with: Infinity (to process images to point clouds),Leica JetStream（发布点云）和3D Reshaper(to do mesh modelling based on point clouds).
In Tan's words,"With the GS18 I, I just need to point the camera onto the subject that I want to capture while walking. For example, in one of my projects, the time taken to survey the trial pit with the GS18 I was no more than five minutes. The time taken to post-process in the office using Infinity software was 30 minutes. I can produce true colourised point clouds, which I can export to orthophotos and also create digital surface models. It is also possible to create hundreds of topo points from the georeferenced images quickly and efficiently."
试验坑中的安全性和速度
Carrying out trial pit or as-built trench surveys can be very challenging. Surveyors usually need to follow the site contractors' workflow and schedule as the trench needs to be backfilled, and the road lane needs to be re-opened as quickly as possible.
当JTRS的任务是公用事力沟渠文件时，他们将其视为将其新的GNSS Rover进行真实测试的机会。除了对试验坑和地下公用事业进行齐全的调查外，GS18我还允许它们创建3D点云并将其顺序为3D网格模型。
The freedom of using both the pole tip and Visual Positioning to measure in the field and using simple workflow for processing in the office, pushes the boundary of surveying for JTRS to another level.
质量控制检查调查的信心和准确性
For a building and scanning project that included the 3D scanning of 1,200 blocks, JTRS carried the quality check of the georeferenced scanned data with the GS18 I. Once again, the tilt and Visual Positioning technologies on the sensor made it possible to access previously unreachable points.“在我们的一个项目与HDB(住房、健康ent Board), I was able to pick up coordinates of points captured during my walk using Visual Positioning. With the GS18 I, it is convenient and fast to survey and I can get instant results before leaving the site.
When it was not possible to use the pole tip because it was too close to the building's edge and the RTK signal couldn't initialise we used the Visual Positioning method and walked further away from the building where there is RTK signal. Most of the time, we would use both methods if the site condition enables us to do so,"describes Tan.
Smoother workflow + higher quality deliverables = confident clients
JTRS is now able to work safer and save costs on manpower as the GNSS antenna is operated by only one person. To get ready to use the GS18 I on the field, the team needed no training and just one short introduction on how to process the images in Infinity was required.
"Clients are more confident in the quality of the deliverables. With Infinity, I am able to process the images into true point clouds with accurate georeferencing. With Visual Positioning, I can capture two images per second as I walk, and each image comes with global coordinates from a single source – the GS18 I. It is like flying the drone installed with a GNSS antenna and camera, except we are walking,"sustains Tan.
"Clients are more confident in the quality of the deliverables. With Infinity, I am able to process the images into true point clouds with accurate georeferencing. With Visual Positioning, I can capture two images per second as I walk, and each image comes with global coordinates from a single source – the GS18 I. It is like flying the drone installed with a GNSS antenna and camera, except we are walking,"sustains Tan.
Opening new opportunities by measuring the point cloud
JTRS specialises in reality capture through 3D laser scanning and photogrammetry. The GS18 I adds to the company's motto of "measuring the point cloud" with an antenna that allows surveyors to capture sites freely and safely, carry QC for almost all its data and create multiple deliverables.
"We can further develop point clouds into a 3D mesh model – that's reality capture and it is very helpful in visualisation – many times better than a single point, single line or a 2D drawing. With Infinity you can also create Digital Surface Models. This is good for engineers or designers who can use this TIN model in their design work and easily extract heights and contours, water flows and more."谭说。
GS18我不仅在帮助改善JTRS提供的当前服务，还可以帮助公司提供新服务。能够更快地创建多个可交付成果，并减少资源，从而带来了更多的项目机会。
"We can further develop point clouds into a 3D mesh model – that's reality capture and it is very helpful in visualisation – many times better than a single point, single line or a 2D drawing. With Infinity you can also create Digital Surface Models. This is good for engineers or designers who can use this TIN model in their design work and easily extract heights and contours, water flows and more."谭说。
GS18我不仅在帮助改善JTRS提供的当前服务，还可以帮助公司提供新服务。能够更快地创建多个可交付成果，并减少资源，从而带来了更多的项目机会。
If you want to hear and see more,听我们的网络研讨会吉米的高手。
Leica GS18 i
Универсальный геодезический ГНСС RTK-ровер с визуальным позиционированием
环境，社会和治理影响：工人安全
工人安全可能是特定调查任务的主要问题。例如，在沟渠中或附近工作可能是危险的：风险包括掉入沟渠，暴露于有毒烟雾中，接触埋藏的服务线，被机械击中等等。任何需要更少的人，现场时间更少的技术都可以确保工人的安全。我是为希望快速捕获环境的测量师设计的。他们稍后可以在办公室中确定要测量和这样做的点，从而节省昂贵且可能有风险的现场时间。
工人安全可能是特定调查任务的主要问题。Working in or near trenches, for example, can be hazardous: Risks include falling into the trench,...