WGS84 to Lambert-93 Converter
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.
About Lambert-93 Coordinate System
Lambert-93 (RGF93 / Lambert-93, EPSG:2154) is the official projected coordinate system for metropolitan France. It uses a Lambert Conformal Conic projection with two standard parallels (44°N and 49°N) to minimize distortion across the French territory. It is based on the RGF93 geodetic datum with the GRS80 ellipsoid.
Lambert-93 was established as part of the RGF93 system in the 1990s by IGN France to provide a unified national projection system, replacing the multiple local projection zones previously used. It became mandatory for all French public spatial data.
Lambert-93 is the mandated projection system for all French government mapping and public GIS data. Coordinates are expressed in meters as easting and northing values (X, Y). It covers all of metropolitan France with minimal scale distortion.
Lambert-93 is the mandatory projection for all French government spatial data, replacing older local projection systems.
Lambert-93 uses a Lambert Conformal Conic projection with standard parallels at 44°N and 49°N, providing high accuracy across metropolitan France.
WGS84 to Lambert-93 Conversion Guide
// WGS84 → Lambert-93 coordinate transformation
// Using WGS84 ellipsoid (a = 6378137m, 1/f = 298.257223563)
// Geodetic to Cartesian (if needed for intermediate step):
N = a / √(1 - e² × sin²(φ))
X = N × cos(φ) × cos(λ)
Y = N × cos(φ) × sin(λ)
Z = N × (1 - e²) × sin(φ)
// Apply datum-specific transformation
// The exact parameters depend on the specific coordinate system
// Convert back to geodetic coordinates:
λ' = atan2(Y, X)
p = √(X² + Y²)
φ' = atan2(Z, p × (1 - e²)) // iterativeThe conversion between WGS84 and Lambert-93 uses standard geodetic transformation methods, converting between geographic and geocentric coordinates and applying the appropriate datum transformation.
- Enter your WGS84 coordinates in the input field (latitude, longitude, one pair per line)
- Click the Convert button to transform coordinates from WGS84 to Lambert-93
- Review the converted Lambert-93 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