Point Cloud data from the photogrammetry survey with the tunnel lidar laser scan survey data overlain (red)

Chirk Aqueduct, Viaduct & Tunnel intergrated Survey

As the snow began to melt a couple of weeks ago Crucial Services undertook a photogrammetry and mobile laser scanning survey of Chirk Aqueduct, the adjacent Viaduct, the canal tunnel passing under the railway and the local roads above both.

The photogrammetric survey was undertaken early Sunday morning before any passenger or freight train traffic was running on the line and before crowds of people were using the canal. Over 2,800 photographs were taken of the area – split into batches to ensure visual line of sight (VLOS) was maintained at all times.

3D model of Chirk aqueduct and viaduct

3D model of Chirk aqueduct and viaduct

20 million triangle Model with 4.84 gigapixel textured mesh
Click to open the interactive model

Subsequently, a mobile 3d laser scan was measured of the same areas. Again split into loops to keep within the optimal scan duration. Additionally, a loop was measured through and over the canal tunnel. This was carried out using a GeoSlam Horizon RT Vision in a handheld configuration.

Mobile laser scan data of Chirk Aqueduct, floodplain and Station road

This image shows the mobile laser scan data of Chirk Aqueduct, floodplain, tunnel and Station Rd

Orthophotograph and lidar survey data of Chirk Aqueduct

Mobile laser scan data overlain
upon the photogrammetry orthophotograph

Photogrammetry Orthophotograph of Chirk Aqueduct

Photogrammetry Orthophotograph of Chirk Aqueduct

Topographical data with orthographic image

End to end the survey took 3 hours including:

Point Cloud data from the photogrammetry survey with the tunnel lidar laser scan survey data overlain (red)

Point Cloud data from the photogrammetry survey with the tunnel lidar laser scan survey data (red)

If you would like to talk about how we can survey your assets or sites, from both the ground and the air, for the most comprehensive survey possible please contact us

Further reading

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David Walker McInstCES AssocRICS avatar