Which of the following methods is/are commonly used for plotting details in plane table surveying? i. Radiation ii. Intersection iii. Triangulation iv. Compassing
- AOnly (i)
- BOnly (i) and (ii)Correct
- COnly (iii) and (iv)
- D(i), (ii), (iii) and (iv)
Solution
Concept
Plotting methods in plane table surveying
Formula
NONE
Step-by-step solution
1. Plane table surveying employs methods such as radiation, intersection, traversing, and resection for plotting field details. Answer: B
Explanation
Radiation and intersection are the two fundamental methods used on a plane table to plot localized physical details and locate target points on the field sheet. Radiation plots points directly accessible from a single station using measured distances, while intersection locates points using intersecting sight lines from two stations. Therefore, option B correctly identifies these two standard plotting methods.
Why the other options are wrong
C) Triangulation and compassing are not primary detail plotting methods in plane table surveying. D) Not all four methods listed are standard detail-plotting methods in plane table surveying.
Shortcut
Plane table detail plotting methods = Radiation and Intersection.
Common mistake
Selecting Option D by incorrectly classifying triangulation and compassing as standard plane table detail-plotting methods.
Correct answer: B) Only (i) and (ii)