The 'photogrammetric stereomodel' from two overlapping aerial photos allows determination of:
Choose the correct answer
Only 2D planimetric positions without height
3D ground coordinates (X, Y, Z) from parallax between two overlapping photos — enables DEM and full mapping
Only colour information
Wind speed at flight altitude
Correct Answer
B. 3D ground coordinates (X, Y, Z) from parallax between two overlapping photos — enables DEM and full mapping
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Stereoscopic model: two photos with overlap (endlap 60%, sidelap 30%) form stereomodel when viewed simultaneously. From parallax differences: 3D coordinates of ground points measurable. Output: DEM (Digital Elevation Model), orthophoto, planimetric map. Base-height ratio (B/H) determines height accuracy: Δh = H × Δp / (B) where Δp = parallax measurement error. Analytical photogrammetry → digital photogrammetry (SfM).
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.