JGD2000 to WGS84 Converter
About JGD2000 Coordinate System
JGD2000 was Japan's national geodetic system before the 2011 earthquake, based on ITRF94 and the GRS80 ellipsoid.
JGD2000 replaced the Tokyo Datum in 2002, modernizing Japan's surveying infrastructure with GPS-compatible coordinates.
JGD2000 is still used for legacy data and some pre-2011 mapping projects in Japan.
JGD2000 replaced the older Tokyo Datum, which had offsets of up to 450 meters from GPS coordinates.
JGD2000 is based on the International Terrestrial Reference Frame 1994 (ITRF94).
About WGS84 Coordinate System
WGS84 (World Geodetic System 1984) is the global standard geodetic reference system used by GPS. It defines an Earth-centered, Earth-fixed coordinate system and geodetic datum.
Developed by the U.S. Department of Defense in 1984, WGS84 has undergone several refinements (WGS84(G730), WGS84(G873), WGS84(G1150), WGS84(G1762)) to improve accuracy through GPS satellite observations.
WGS84 is the default coordinate system for GPS receivers worldwide. It is used in aviation, maritime navigation, Google Maps, OpenStreetMap, GIS applications, and scientific research.
WGS84 is the native coordinate system of the Global Positioning System (GPS), ensuring direct compatibility with all GPS receivers and satellite navigation systems worldwide.
As the most widely adopted geodetic datum, WGS84 provides a consistent global reference frame for mapping, surveying, and geospatial data exchange across international boundaries.
With continuous refinements, WGS84 achieves centimeter-level accuracy globally, making it suitable for high-precision applications like surveying, drone navigation, and scientific research.
JGD2000 → WGS84 Conversion Guide
// JGD2000 → WGS84 (Japanese datum shift)
// Uses a simple 3-parameter geocentric translation
// Step 1: Geodetic → Cartesian (GRS80 ellipsoid)
X = (N + h) × cos(φ) × cos(λ)
Y = (N + h) × cos(φ) × sin(λ)
Z = (N × (1 - e²) + h) × sin(φ)
// Step 2: Apply datum shift
// Parameters: ΔX = -146.414, 507.337, 681.921 (meters)
X' = X + ΔX
Y' = Y + ΔY
Z' = Z + ΔZ
// Step 3: Cartesian → Geodetic (GRS80 ellipsoid)
// Iterative calculation for latitude
p = √(X'² + Y'²)
θ = atan2(Z' × a, p × (1 - f))
φ' = atan2(Z' + e² × (1 - f) × a × sin³(θ), p - e² × a × cos³(θ))
λ' = atan2(Y', X')Japanese datum transformations (JGD2000, JGD2011) use a simple 3-parameter geocentric translation from WGS84. JGD2011 was updated after the 2011 Tohoku earthquake.
- Enter your JGD2000 coordinates in the input field (latitude, longitude, one pair per line)
- Click the Convert button to transform coordinates from JGD2000 to WGS84
- Review the converted WGS84 coordinates in the output field
- Copy the results or save them as an XLSX file for further use
- Ensure coordinates are within valid ranges before conversion
- For batch conversions, enter one coordinate pair per line
- Verify a sample of converted coordinates on your target platform
- All conversions are performed client-side for complete data privacy