LLA to ECEF Converter Calculator & Formula

Geodetic coordinates viz. Latitude, Longitude, Altitude (LLA) are most intuitive for users, but internal GNSS solutions work in ECEF Cartesian coordinates. Converting between these systems is a cornerstone of GPS and geospatial engineering.

GPS LLA to ECEF Converter Calculator

Inputs Clear Input

Latitude, in degrees (input1) :

Longitude, in degrees (input2) :

Altitude, in meters (input3) :

Outputs Calculate

Radius of Curvature (N), meters (output1) :

X, meters (output2) :

Y, meters (output3) :

Z, meters (output4) :

INPUTS:

• Latitude (ϕ) = 40 degrees
• Longitude (λ) = -75 degrees
• Altitude (h) = 100 meters

OUTPUTS:

• Radius of Curvature (N) = 6386976.16 meters
• X = 1266345.73 meters
• Y = -4726066.62 meters
• Z = 4078049.85 meters

Constants:

• Semi-major axis (a) = 6,378,137
• Eccentricity squared (e^2) = 0.00669438

GPS LLA to ECEF Converter Formula

Benefits/Applications

• Transforms human friendly location into machine friendly ECEF format.
• Enables 3D geometric calculations and satellite distance computations.
• Used in UAV navigation, GIS conversions and coordinate transformation workflows.

Summary: This calculator bridges human and machine coordinate systems, enabling any GNSS data processing pipeline to compute precise geometric positions.