A14 Road and Railway Intersection Surveying for SKANSKA

Job Type Mapping an A14 highway junction
CompanySKANSKA
CountryUK
Project Date February 2017
Project Size7 acres (170m x170m)
Drone Falcon 8
Flight Altitude75m (246ft) & 130m (426ft)
AccuracyBetter than 2cm (0.065ft)
DatuSurvey savings1 field hour + 1 office day Instead of 20 days

skanska-logo-

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.

Skanska - Data aquisition

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

Skanska - textured 3D model

 

True Orthophoto

Skanska - true orthophoto

 

Polygon Map

Skanska - polygon map

DatuSurvey Enterprise Savings

Skanska Comparison