essential
likely
maybe
probably not
Front (prompt)
Vertical vs oblique aerial photography — the 3° rule?
Plain English (default view) — short, conversational, lightly seasoned with science
🔬 Scientific / formula (revealed on click) — markdown + $$…$$ ok
- 📷 **Vertical** — optical axis **within 3°** of straight down - Less geometric distortion (uniform scale) - Used for: planimetric maps, topographic maps, orthophotos, DEMs - 🎥 **Oblique** — optical axis **> 3°** from vertical - More distortion (foreground big, background small) - Covers a larger area in one frame, shows terrain relief Mnemonic: nadir is dead-center, oblique is at an angle.
💡 Mnemonic / memory aid (shown on hover)
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