Question:

Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas are known as:

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Geodetic surveys consider Earth’s curvature — essential for national mapping grids.
Updated On: Jun 12, 2025
  • plane surveys
  • geodetic surveys
  • geographical surveys
  • topographical surveys
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The Correct Option is B

Solution and Explanation

To understand the purpose of surveys designed for a national grid of control, it's essential to consider the characteristics and objectives of each survey type listed:
1. Plane Surveys: These are conducted over small areas assuming the Earth's surface to be flat. They are not suitable for creating a national grid for large areas as they do not account for the Earth's curvature.
2. Geographical Surveys: These focus typically on gathering information about geographical features and do not primarily serve the purpose of establishing a national control grid for mapping.
3. Topographical Surveys: They detail features of the terrain and are more about mapping the physical and cultural aspects of a small area.
4. Geodetic Surveys: These are surveys intended to establish a grid that considers the Earth's curvature, making them accurate over large distances. This type of survey creates a precise control network, ideal for national mapping projects. Therefore, geodetic surveys are best suited for providing a national grid of control.
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