Principles of Plane Table Surveying

In this article, we will see more details about Principles of Plane Table surveying . Let's see, What is Plane Table Surveying and what are its principles? Principles of Plane Table Surveying are based on direct plotting of the field observations on a drawing sheet fixed on a plane table. The key principles are: 1. Parallelism: The edge of the alidade (or the line of sight) must be kept parallel to the line drawn on the paper while sighting an object. This ensures accurate orientation. 2. Centering: The point on the paper representing a ground station (like station A) should be exactly over the actual position of that station on the ground. This is done using a plumbing fork or plumb bob. 3. Orientation: The table must be oriented (i.e., rotated) such that the lines on the paper are parallel to the corresponding lines on the ground. This can be done by: Backsighting (most accurate) Using compass (less accurate) ...