The 'base to height ratio' in aerial photogrammetry for stereo viewing determines:
Choose the correct answer
Only horizontal accuracy
Vertical exaggeration in stereoscopic model and vertical measurement accuracy — larger B/H = better height accuracy
Only the number of photographs taken
Colour accuracy of photos
Correct Answer
B. Vertical exaggeration in stereoscopic model and vertical measurement accuracy — larger B/H = better height accuracy
Why is this the answer?
Base-to-height ratio B/H (also called base-height ratio): B = air base between consecutive photo centres, H = flying height above ground. B/H determines: vertical exaggeration in stereoviewing and height accuracy of photogrammetric measurements. For better height accuracy: larger B/H. Standard B/H ≈ 0.4–0.7 (for 60% endlap). Very small B/H gives poor vertical resolution.
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