O Folgoso tunnel (case study)

The Folgoso tunnel is the largest engineering project and one of the cornerstones of the current highway A-52, that connects the principal cities in southern Galicia, Spain. The O Folgoso tunnel’s course runs in the municipality of A Cañiza, with a total length of 2500 m. The tunnel is monitored by a control center that checks the ventilation, light, signaling, communications and fire detection systems among others.

Object description

(No object description available.)

Civil engineering type

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Road network Tunnel

Year of construction

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1998

Composed of materials

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Shotcrete

Location coordinates

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42° 10' 29.36" N, 8° 22' 4.37" W

Country

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Spain

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Object analysis

Automatic method for the detection of tunnel luminaries as well as to obtain their 3D spatial location, using colored 3D point clouds. Detection performance is verified by experiments carried on real data acquired with the Lynx Mobile Mapper system. In short, it seeks the detection of luminaries automatically and improve the productivity of tunnel inspections.

Case type

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Research

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Object state

The first step simply consists of the point cloud pre-segmentation based on height values of the luminaire. Where all the points from the point cloud above the reference level are considered for the next stage. The stage 2, thresholds for classification are extracted from the color histogram analysis taken of 8-bit color images. Finally, is refined the existing segmentation of the luminaires using known values of vehicle speed (v) and camera shutter speed (t), and in this way calculate their centroids.

Observed deterioration processes

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Observed damage types

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Performance indicators

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Images

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Documents

This case study was contributed by Gabriel Suárez of Universidad De Vigo. Last edited by technical staff.