The 'photogrammetric control' (ground control points) in aerial survey are required for:
Choose the correct answer
Only for taking photographs from aircraft
Absolute orientation and georeferencing — known ground coordinates to convert model to real-world coordinate system
Measuring pilot''s flight path
Calibrating the aircraft compass
Correct Answer
B. Absolute orientation and georeferencing — known ground coordinates to convert model to real-world coordinate system
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Ground Control Points (GCPs): surveyed points on the ground with known X, Y, Z coordinates, identifiable on photos. Used for: absolute orientation of stereomodel (scaling, rotating, levelling the model to ground), georeferencing, orthorectification. Minimum 3–4 GCPs per stereomodel (for 6 exterior orientation parameters). With GNSS direct georeferencing: fewer GCPs needed. Accuracy of map = accuracy of GCPs.
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