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Photogrammetry
Construction of terrain models and 3D models from photogrammetry are based on hundreds and thousands of images takes from drones.
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The models have absolute coordinates, and they are verified by control points taken on ground before and after the flight.
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Photogrammetry is prefered for areas without trees and tall grass, and where the end result needs very high point density.

With our full-frame cameras we will achieve approximately 1-2 cm horizontal relative accuracy from 50 meter above ground (AGL), and 1-3 cm vertcal accuracy.
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