Engineering Surveying
(LSGI2961)
Height Determination
Lecturer: Dr Lawrence Lau
1
, Outline
• Leveling Equipment
• Leveling Principles
• Leveling Booking
• Errors and their effects
, Leveling Equipment
• Automatic or Self-Leveling Levels = modern types most commonly used
nowadays. Automatic levels have bullseye level to get instrument
approximately level. The instrument then sets itself level.
• It has a swinging prism or mirror compensator which maintains a horizontal
line of sight by allowing only the horizontal rays coming into the instrument
to pass through the optical center of the instrument. Good instruments to
use because they can maintain level even if the instrument is jiggled
around a little.
(LSGI2961)
Height Determination
Lecturer: Dr Lawrence Lau
1
, Outline
• Leveling Equipment
• Leveling Principles
• Leveling Booking
• Errors and their effects
, Leveling Equipment
• Automatic or Self-Leveling Levels = modern types most commonly used
nowadays. Automatic levels have bullseye level to get instrument
approximately level. The instrument then sets itself level.
• It has a swinging prism or mirror compensator which maintains a horizontal
line of sight by allowing only the horizontal rays coming into the instrument
to pass through the optical center of the instrument. Good instruments to
use because they can maintain level even if the instrument is jiggled
around a little.
