Triangulation Calculator

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Intersection uses two bearings; trilateration uses two distances. Both find the same kind of unknown point.
X (Easting) coordinate of known station A.
m
Y (Northing) coordinate of known station A.
m
Azimuth (degrees clockwise from North) from station A toward the unknown point.
deg
X (Easting) coordinate of known station B.
m
Y (Northing) coordinate of known station B.
m
Azimuth (degrees clockwise from North) from station B toward the unknown point.
deg
Unknown point X
400m

X (Easting) coordinate of the solved point

Unknown point Y400m
Distance A to P565.685m
Distance B to P565.685m
Distance A to B800m
Bearing A to P45deg
Bearing B to P315deg
Angle at P90deg
Triangle area160,000m²

Solved: unknown point at (400.000, 400.000)

  • The unknown point is at coordinates (400.000, 400.000) using bearing intersection.
  • It is 565.69 m from station A and 565.69 m from station B.
  • The baseline (A to B) is 800.00 m.
  • The intersection angle at the unknown point is 90.0 deg, a strong geometry - angles near 90 degrees give the most precise intersection.

Next stepFor real-world survey work, always check geometry (intersection angle at P should be 30-150 deg) and verify with a third station observation where possible.

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