Accurate execution of an orthophotoplan involves the correct taking of nadir frames and the exact determination of ground control points. The quality of the aerial images is influenced by the camera sensor, the optical parameters of the lens used and by the stability of the aerial photography platform (airplane, helicopter).
The frames are taken so as to have optimal coverage (longitudinal minimum 60% and transverse minimum 30%), and deviations from the flight path and the values of angular deviations (pitch, roll, azimuth) are maintained within accepted tolerances.
The obtained images have natural, real colors, and optimal values of brightness, color tones and contrast.
Digital frames have a GSD value of up to 0.05 meters. GSD Ground Sampling Distance is the distance between the centers of adjacent pixels measured on the ground.
Landmarks and pre-marked landmarks are determined in the field with an accuracy of approximately 0.02 meters. The final photogrammetric product has a high geometric precision. Thus, for an orthophotoplan made at a scale of 1: 500, the accuracy is about 0.1 meters.
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