Human Errors

Inaccurate levelling of instrument through surveyor although setting the instrument or settling of level during surveying introduces errors. The error is cumulative. The error could be prevented through taking care to set the level in a firm ground and levelling it carefully. If setting on soft ground cannot be prevented, the legs of level tripod are kept on wooden platform or on stakes driven within the ground. The same precaution could be taken at change and intermediate stations to prevent staff settlement. Care should be taken to avoid any contact with tripod while sighting and taking the staff reading. Other human errors could be error in focusing or staff not being held perfectly vertical although taking the level readings, wrong recording of readings or recording in wrong columns etc.