Tempe Valley – Risk management – 3D Photogrammetric Mapping

Title: Three-dimensional photogrammetric mapping eastern slope valley Tempe

Funding: Egnatia Odos SA

Objective: The depiction of terrain model of the region of the rocks of Tempe, which formed the basis for investigating the causes of accidents. Imprinting the slope in approximately 4 km, with an accuracy of better than 50 cm.

Landslides Soil is an issue related to weather changes and extreme weather conditions, snow and rain.

In November 2009 there was a major landslide in Tempe valley leading to cut the main road of the country for several weeks with incalculable economic cost.
By the method of Laser Scanner were scanned 21 stops from the opposite side of the valley, resulting in the creation of a digital high-density and precision terrain model.
The combination of 112 aerial photographs and photogrammetric processing methods created a digital terrain model with 1,700,000 points and 30 cm accuracy.
These two models were consolidated and the final complete model was the original to create incisions in a total of 26 positions.

In the case of the capture of the eastern slope of the valley of Tempe was simultaneous use of photogrammetric methods and methods of three-dimensional laser scanners.

The purpose of the stent was to produce a 3D terrain model with accuracy of less than 30 cm to simulate potential landslides along the eastern slope of the valley. At this case favored the sharing of two methods due to the nature of the object and its limited visibility in many points of the area.