News on HS2 in Hillingdon

Competing against 500 other nominees worldwide, HS2’s main works civils contractor Align JV and civil engineering company Roadbridge have won a Green Apple Environment Award in the Innovation category for their use of thermal camera drones to spot Skylark nests.

The Green Apple Awards are run by the Green Organisation – an independent international environment group that recognises, rewards and promotes environmental best practice around the world.

A thermal camera drone used for surveys

Align JV, responsible for delivering the section of the highspeed railway which includes the Chiltern Tunnel and the Colne Valley Viaduct, worked with its contractor Roadbridge, to introduce thermal camera drones to dramatically improve the accuracy of nesting birds’ surveys, helping to protect the species and enable faster and more effective results for ecologists working on the project.

As ground-nesting birds with well camouflaged nests, Skylarks are very difficult to survey. However, using a thermal camera, the drone can calibrate to the ground temperature and other objects to lock onto a heat source and identify the birds’ nests extremely accurately. This includes birds on the nest, eggs on the nest and birds sheltering on the ground.

At 12 metres above ground level the drone captures an area of approximately 9m2, which reduces search times and provides a clear perspective from a 90 degree view of the ground below. Exclusion zones are then put on Computer Aided Design (CAD) drawings and into the Global Positioning System (GPS) of machinery working on site to let operators know when they are working near exclusion zones, to protect nests and allow works to progress safely.

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