Which of the following is called Large Scale?

Question

Examoogle · Accepted Answer

Option C: $1 	ext{ cm} = 10 	ext{ m or less than } 10 	ext{ m}$

Explanation & Concepts:
In surveying, a map scale is considered 'Large' when it represents a relatively small area on the ground with a high level of detail. By convention, a scale where 1 cm on the map represents 10 m or less on the ground (Scale $\ge$ 1:1000) is classified as a Large Scale map.

Working Principle: The scale represents the ratio of map distance to ground distance ($RF = \frac{	ext{Map Distance}}{	ext{Ground Distance}}$). A larger denominator indicates a smaller scale (zoomed out), while a smaller denominator indicates a larger scale (zoomed in). Because $1:1000$ represents a greater value than $1:10000$, the former is termed 'Large Scale'.

Key Formulas: $RF = \frac{1}{n}$ — Representative Fraction where $n$ is the denominator; $	ext{Scale} = \frac{	ext{Map distance}}{	ext{Ground distance}}$

Key Points: Large scale maps provide more detail but cover a smaller geographical area.; Small scale maps provide less detail but cover a larger geographical area.; Cadastral maps and town plans are typical examples of large-scale maps.; The threshold of 10 m per cm serves as a standard demarcation in engineering surveying textbooks.

Advantages: High accuracy for measurements; Detailed depiction of small features and topography

Disadvantages: Covers only a limited spatial extent; Requires a large number of map sheets for a city or region

Applications: Cadastral surveying; Site development plans; Detailed architectural layout

Additional Info: Small scale is typically used for general maps like those of a country or continent.. Option A (10-100 m) generally represents medium scale maps.

Answer: C is correct — A scale where 1 cm represents 10 m or less is classified as a Large Scale due to the higher level of detail it captures.

Exam Tip: Remember: The larger the ground area covered by the same map size, the smaller the scale. Large denominator = Small scale.

Examoogle · Answer

Option A: $1 	ext{ cm} = 10 	ext{ m to } 100 	ext{ m}$

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Option B: $1 	ext{ cm} = 100 	ext{ m or more than } 100 	ext{ m}$

Examoogle · Answer

Option D: None of the above

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