In surveying, a point is established using:

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SSC JE Civil 15 Nov 2022 Shift 3 Official Paper
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  1. at the most three points of reference
  2. at the most two, already fixed points of reference
  3. at least two points of reference
  4. at least two, already fixed points of reference

Answer (Detailed Solution Below)

Option 4 : at least two, already fixed points of reference
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Explanation:
  • In whole to part, the error is localized as it prevents accumulation of error and,
  • In part to whole, the error is expanded.

The fundamental principles of plane surveying are:

1. Location of a point by measurement from two points of reference:

  • Two control points are selected in an area and the distance between them is measured accurately.

 

Assignment 16 Rohit SSC JE CE 24 JAN 18 Evening 19Q.docx 3

 

2. Working from whole to the part:

  • Major control points are selected and measured first with a high degree of precision, minor details can be collected later on even with less degree of precision. In this manner, errors involved in minor detailing will be compensating and will not affect the major dimensions.

Note:

  • The main idea of working from whole to part is to localize errors and prevent their accumulation.
  • On the contrary, working from part to whole, the errors accumulate and expand to a greater magnitude and the survey work becomes uncontrollable at the end.
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