Explain intersection method of plane survey.
Intersection method of plane tabling 1. Lay out a base line AB and measure it and Plot a distance ‘ab’ on sheet using any scale. 2.Set up instrument at ‘A’ with ‘a’ over ‘A’ 3.Orient the table by placing alidade ‘ab’ and turn table until ranging rod at ‘B’ is bisected and clamp it. 4. With alidade touching point ‘a’ draw rays ab, ad, ag, af, ac of indefinite length as shown in figure below. 5. The table is then moved to station ‘B’ orient by back sighting on ‘A’ say ray ba. Draw rays towards points previously sighted rays bd, bg, bf, bc are drawn to determine points intersection, d, g, f, c.