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Construction of terrain models and 3D models from photogrammetry are based on hundreds and thousands of images takes from drones.
The models have absolute coordinates, and they are verified by control points taken on ground before and after the flight.
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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