Photogrammetry
Photogrammetry first reconstructs a 3D scene from overlapping images by matching features and optimizing camera positions (bundle adjustment). Without GCPs the model is accurate internally but floats in space with possible scale and tilt errors. By adding a small number of precisely surveyed Ground Control Points (real X,Y,Z coordinates), you force the bundle adjustment to align the entire model to the real world — dramatically improving absolute positional accuracy (especially vertical) and removing systematic doming/tilting errors. With 6–12 well-distributed, high-accuracy GCPs you can typically achieve 2–10 cm horizontal and 3–15 cm vertical absolute accuracy — even from consumer drones.
Volumetrics
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Level-three heading
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