The determination of orthometric height based on gravity in Korea

Yoo Jung Lee, Yun Soo Choi, Jay Hyoun Kwon, Ji Sun Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A vertical datum requires an origin, which is a point on the Earth's surface where the height of the point is a defined value(26.6871m). From this origin point, heights (height differences) can be measured to any other point using standard leveling and gravity measurement procedures. However, the leveling network over the Korea has been established by using the normal gravity instead of the actual gravity values, and the heights for the points are published by National Geographic Information Institute (NGU). This may cause height error especially in the area where high-relief mountains are dominant Therefore, the height errors caused by using normal gravity instead of actual gravity values are analyzed in this study. Then, the differences between the orthometric heights and the published heights, i.e., normal orthometric height are analyzed.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalJournal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
Issue number1
StatePublished - 2010


  • Airborne gravity
  • Benchmark
  • Qrthometric Height


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