What is the average triangle closure for tertiary triangulation?1. Les

What is the average triangle closure for tertiary triangulation?1. Less than 1 s2. 3 s3. 9 s4. 6 s

Answer» Correct Answer - Option 4 : 6 s

Concepts:

The triangulation Survey is classified into three types on the basis of triangulation of a line of length and azimuth with accuracy.

The general specifications of these three types of surveys are given below in the tabulated form:

Parameter	Primary Triangulation	Secondary Triangulation	Tertiary Triangulation
Average triangle closure	Less than a Second	Less than 3 Seconds	Less than 6 Seconds
Maximum triangle closure Length	Less than 3 seconds	Less than 8 seconds	Less than 12 seconds
Length of the sides of triangles	30 to 150 kms	8 to 65 kms	1.5 to 10 kms
Actual error of base	1 in 300000	1 in 150000	1 in 75000
Probable error of base	1 in 1000000	1 in 5000000	1 in 250000