2. Key Activities
  3. Geodesy
  4. Triangulation


  • Geodetic origin point
  • Triangulation
  • Measurement of Unified Control Point
  • Leveling
  • Gravity Surveying
  • Geomagnetism Surveying
  • Very Long Baseline Interferometry (VLBI)
Triangulation points of Korea established from 1910s by triangulation survey. After NGII adopted GPS survey in 1995, 10,000 over 17,000 triangulation points are surveyed by GPS. Currently 17,000 triangulation points are distributed across the country approximately in 3km distance. Since most of the points installed in mountain peaks to ensure visibility between points, accessibility of them was not good. Newly installed unified control points are replacing significant portion of the demand of geodetic reference.
  • Triangulation station Triangulation point
  • Measuring triangulation Measuring triangulation point