Computer · Surveying
Which of the following statements is INCORRECT with regard to precise levelling when compared to ordinary levelling?
- 1Two rodmen are employed, and backsight and foresight are taken in quick succession.
- 2Rod readings are taken against only the two horizontal stadia hairs of the diaphragm.✓
- 3The length of sight is limited to a maximum of about 100 m.
- 4High-grade levels and stadia rods are used in precise levelling.
Correct answer
Rod readings are taken against only the two horizontal stadia hairs of the diaphragm.
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