Certified Forester Practice Exam

What alignment percentage should be maintained when printing aerial photographs?

1. 50% at the width and 20% between strips

2. 70% at the width and 40% between strips

3. 60% at the width and 30% between strips

4. 80% at the width and 50% between strips

The correct answer is: 60% at the width and 30% between strips

Maintaining a 60% overlap at the width of aerial photographs and a 30% overlap between strips is critical for ensuring high-quality imagery that captures all necessary details while minimizing gaps. This level of alignment allows for sufficient information in each photograph, making it easier to stitch images seamlessly together and create a cohesive aerial map. The 60% overlap at the width ensures that adjacent photos have enough common area for accurate feature matching and helps even out discrepancies due to factors like camera angle variations and terrain relief. The 30% overlap between strips is also essential to guarantee that there are no unrecorded areas, which ensures complete coverage and facilitates reliable data collection for various applications like mapping, forestry assessments, and land use planning. In contrast, other percentage combinations would compromise image continuity, increase the possibility of gaps, or lead to redundant information that doesn’t enhance the overall quality of the resulting imagery. This thoughtful approach is rooted in photogrammetry principles, which guide the effective acquisition and processing of aerial images.