Here are the formulas and parameters to transform WGS 72 coordinates to WGS 84 coordinates
FORMULAS
- Δφ" = (4.5 cos φ) / (a sin 1") + (Δf sin 2φ) / (sin 1") (Unit = Arc Seconds)
- Δλ" = 0.554 (Unit = Arc Seconds)
- Δh = 4.5 sin φ + a Δf sin2 φ - Δa + Δr (Unit = Meters)
- Δφ = Δφ" x 1" (Unit = radians)
- Δλ = Δλ" x 1" (Unit = radians)
PARAMETERS
- Δf = 0.3121057 x 10-7
- a = 6378135 m
- Δa = 2.0 m
- Δr = 1.4 m
- 1" = pi / (3600.0 * 180.0) rad
To obtain WGS 84 coordinates, add the Δφ, Δλ, Δh changes calculated using WGS 72 coordinates to the WGS 72 coordinates (φ, λ, h, respectively). Latitude is positive north and longitude is positive east (0° to 180°).
RESULT
- φ WGS84 = φ + Δφ
- λ WGS84 = λ + Δλ
- h WGS84 = h + Δh
Documentation [p105-106]