---
title: "Define side overlap"
subject: "Surveying II"
chapter: 7
key: "semester_4/surveying_ii:define-side-overlap"
source: https://www.bctengineer.com/q/semester_4/surveying_ii/define-side-overlap
site: BCT Engineering
---

# Define side overlap

Surveying II · Chapter 7: Photogrammetry and Remote Sensing

- Asked in: 2069 Bhadra, 1 marks
- Video: [5.9 Photograph overlap | CE303 |](https://www.youtube.com/watch?v=e3m3jWNeFyM) — RGPV Official
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_4/surveying_ii/define-side-overlap
- Whole chapter: https://www.bctengineer.com/md/semester_4/surveying_ii/chapter-7

## Question

Define side overlap.

## Short answer

Overlap between photographs of adjacent flight strips, measured perpendicular to the flight direction. It is normally 25–30% to avoid gaps between strips.

## Answer

**Side overlap (side lap)** is the overlap between photographs of adjacent flight strips, measured at right angles to the direction of flight; it is normally 25–30 % so that no gaps are left between strips.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Side overlap is overlap between:
   A. Photos of adjacent flight strips
   B. Consecutive photos in a strip
   C. Photo and map
   D. Two eyes
   Answer: A. It is measured at right angles to flight direction. (Key point: Definition)

2. Normal side overlap:
   A. 60%
   B. 90%
   C. 25-30%
   D. 0%
   Answer: C. 60% is end lap. (Key point: Typical value)

3. Why have side overlap?
   A. So no gaps remain between strips
   B. To get stereo along strip
   C. To increase tilt
   D. To reduce scale
   Answer: A. Side lap ensures complete coverage between adjacent strips. (Key point: Purpose)