A Fundamental Benchmark (FBM) in India is:
Choose the correct answer
A temporary benchmark set by the surveyor for each project
A permanent benchmark of the Survey of India, established with high precision, from which secondary benchmarks are derived
A benchmark on a stone wall
A benchmark set during construction
Correct Answer
B. A permanent benchmark of the Survey of India, established with high precision, from which secondary benchmarks are derived
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GTS (Great Trigonometric Survey) benchmarks = permanent, established by Survey of India, connected to Mean Sea Level at Chennai. FBMs are the primary reference. Secondary BMs are established from FBMs. TBMs (Temporary) are set for project convenience, referenced to GTS if possible.
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