| Job Type | Mapping an A14 highway junction |
| Company | SKANSKA |
| Country | UK |
| Project Date | February 2017 |
| Project Size | 7 acres (170m x170m) |
| Drone | Falcon 8 |
| Flight Altitude | 75m (246ft) & 130m (426ft) |
| Accuracy | Better than 2cm (0.065ft) |
| DatuSurvey savings | 1 field hour + 1 office day Instead of 20 days |
Founded: 1887
Headquarters: Stockholm, Sweden
Operations: Construction and development of commercial property, residential and public private partnership (PPP) projects
Markets: Nordic region , Europe and North America
Employees: 43,000 (2015)
Traded at: Nasdaq Stockholm: SKA B
Revenue: SEK 155.9 billion
www.skanska.com
Description
About Skanska
Skanska is one of the world’s leading project development and construction groups. Skanska, a publicly traded company (Nasdaq Stockholm: SKA B), was established in 1887 with multiple companies in the Nordic region, Europe and North America.
Skanska UK, one of the UK’s top contractors with more than 5,400 employees, maintains major roads and highways in a number of regions in the UK.
The Project
As part of the UK’s A14 improvement scheme which is one of the UK’s largest road projects, it was required to map a busy A14 highway junction including a highway intersection and a railway line. The complex mapping included multiple infrastructure layers (bridge, road and railway line) as well as an accurate snapshot of the surrounding buildings to avoid future damage claims during road reconstruction work.
Traditional Total Station usage posed harsh accessibility issues and safety hazards due to the busy highway and the passing trains. Traditional measurements also caused huge traffic blocks during the measurements process.
A Falcon 8 drone with a 36 megapixel SonyA7R camera was used for high resolution photoshooting. The aerial photography was then processed using DatuSurveyTM Enterprise photogrammetry software.
Data Acquisition
A Falcon 8 drone was used for quick, precise and easy image capturing. A total of 142 images were taken were taken – from various heights.
First flight took images from the height of 80m for:
- Capturing and documenting more details
- Identifying smaller objects
- More precise and detailed 3D model
Second flight took images from the height of 130m for:
- Covering a larger area
- Achieving a sub 2cm mapping accuracy
A total of 142 images were taken using oblique angles.
4 permanent Ground Control points were placed in the area, enabling area geo-referencing capture at any given time, without a need for professional surveyor equipment.
DatuSurvey Enterprise Outputs
The drone’s imagery was analyzed and processed using DatuSurveyTM Enterprise photogrammetry software to quickly generate a detailed CAD model of the area, textured 3D model and true orthophoto.
A point file, including names, codes, descriptions and coordinates of all new points was generated. Overall, more than 450 new points were drafted directly on the images.
The measurement accuracy of all the points was better than 2 cm (0.065ft) in 3D coordinates.
Textured 3D model
True Orthophoto
Polygon Map
DatuSurvey Enterprise Savings
