In a triangulation survey, the base line is selected such that:
Choose the correct answer
It is as short as possible
It is on level ground, its length can be measured accurately, and it is well-conditioned for angle measurement to the first triangles
It passes through the highest point
It avoids any obstacles
Correct Answer
B. It is on level ground, its length can be measured accurately, and it is well-conditioned for angle measurement to the first triangles
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Triangulation base line criteria: (1) On level or gently undulating ground for tape/invar wire measurement; (2) Free from obstacles (at least 3 m clearance for sights); (3) Located so first triangles are well-conditioned (angles 30-120 deg); (4) Length: 1/5 to 1/10 of the side of the first triangle.
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