Computer · Surveying
Reciprocal levelling is employed to determine the accurate difference in elevation between two points which are:
- 1At almost the same elevation and close to each other
- 2Separated by a very large difference in level requiring multiple intermediate setups
- 3Quite close and where it is not possible to set up the instrument midway between them
- 4Quite far apart and where it is not possible to set up the instrument midway between them✓
Correct answer
Quite far apart and where it is not possible to set up the instrument midway between them
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