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Orthophotomap and DSM production. Bramianos Reservoir. Crete Island,Greece

Αssignment

Hydroexigiantiki, Constulting engineers

Challenge

Object of the study was the geomorphological analysis, production of orthophotomaps and remote sensing analysis of the water catchment in Bramiana reservoir, a total area of ​​14.829 Km².

The work included the aerial photography, editing, and creation of orthophotomaps using ground control points from topographic charts, and the production of Digital Surface Model (DSM).

The aerial photography was accomplished using a small unmanned aircraft (UAV) that brought a visible spectrum 16MP resolution camera. The spatial resolution of the orthophotomaps was at 6cm/px and for the coverage of the study area, 10 flights were made and a total of 2270 images taken.
During the post process of the images, 52 ground control points (3D GCPs) and 7 check points (3D Check Points) of known coordinates and altitudes were used, in order to achieve the highest accuracy of the geographical data.

 

Results

  • Orthophotomaps of the water catchment area, resolution 6cm/px, total area of 14.829 Km²
  •  Digital Surface Model creation

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