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Orthophotomap and DSM production. New Evinos River Bridge, Ionia Odos Highway

Assignment

Hydroexigiantiki, Constulting engineers

Challenge

The aim of the project was the aerial photography of Evinos riverbed, upstream of the bridge of Evinochori at a distance of 7,5 km, within the project of the New Bridge of Ionia Odos Highway for orthophotomap and DSM production. Through the point cloud output, the volume of sediment from upstream of the New Bridge was calculated. The photogrammetric coverage was made using a light Unmanned Aerial Vehicle (UAV), carrying visible spectrum camera of 16MP resolution. The flying height was set to 162.4 meters from the takeoff point to achieve a resolution of 5cm / px. For the double coverage of the study area, nine flights was made and a total of 2262 images received. During the post process of the images, 50 ground control points (3D GCPs) and 5 3D Check Points known coordinates and altitude were used, in order to achieve the highest georeferenced precision possible and the control of that precision.

Results

  • Orthophotomaps of the bed of the river. Resolution 5 cm/px, total area of 8,1 Km²
  • Digital Surface Model production (DSM)
  • Cross sections along the axis of the river (scale 1: 1000)

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