In the Republic of Korea, the height of any land, or elevation, is calculated on the basis of the mean sea level (elevation: 0m) of the coastal waters off Incheon. The point fixed on land with a predetermined height (26.6871m) from the mean sea level of Incheon is called the Korean vertical origin point.
Leveling means surveying activity to calculate height, which is essential in defining the elevation of land for a variety of purposes: managing water including waterworks and sewage systems for daily use, investigating the consequences of flood damage to coastal areas resulting from a rise in sea level due to global warming, and collecting fundamental critical information for a variety of construction efforts and disaster preparedness projects.
Since 1990, Korean geodetic vertical datum have been installed and managed every two to four kilometers nationwide at major points such as on the shoulders of national roads, public offices, and schools.
Leveling on the road
Principles of defining an elevation through leveling