Key Activities

National Geodetic Datum

In determining national coordinate reference system, NGII provides high quality information on geodetic surveying

CORS (GNSS observational stations: provision of satellite geodetic service)

Receiving and providing GNSS satellite signals 24/7 to provide autonomous geospatial positioning

60 GNSS control points have been established nationwide since 1995

Providing one-stop national GNSS data service by integrating GNSS CORS separately operated and controlled by eight government departments

  • [ Operation of 60 Satellite Control Points ]

  • [ Real-time kinematic (RTK) Positioning Services ]

Available after obtaining Network RTK membership at Geospatial Information Service Platform

  • Unified Control Point
    No. of control points: 4,282
    Information provided: Geodetic and geocentric coordinates, height and gravity value
  • Triangulation Point
    No. of triangulation points: 16,412
    Information provided: Geodetic and geocentric coordinates
  • Bench mark
    No. of bench marks: 7,300
    (1st grade: 1,141 and 2nd grade: 6,155)
    Type of bench mark: 1st or 2nd grade
    Accuracy: 1st grade = ±2.5㎜√S (roundabout) and 2dn grade = ±5.0㎜√S (roundabout)
  • Gravity Point
    Korean geodetic gravity origin: 979,918.775±0.0001 mgal (located in NGII)
    No. of absolute gravity points: 20
    Use: Establishment of Geoid, etc.
  • Geomagnetic Point
    No. of geomagnetic points: 30
    Information provided: deflection angle, magnetic dip and horizontal component
    Use: Studying horizontal distribution and secular variation of geomagnetism and regional magnetic anomaly

Post-Processed GNSS Data (RINEX)

Download available from Geospatial Information Service Platform