Conversion of Geocentric Coordinate System Latitude-Longitude-Height Data to ENU Coordinates

This article describes the conversion of latitude-longitude-height coordinates from the geocentric coordinate system (ECEF) to the East-North-Up (ENU) coordinate system, implemented through the MATLAB function ECEFtoENV. The ECEFtoENV function accepts latitude, longitude, and height inputs in degrees and performs coordinate transformation using fundamental geodetic algorithms. Key implementation steps involve: 1. Converting angular coordinates from degrees to radians for trigonometric calculations 2. Applying reference ellipsoid parameters (e.g., WGS84) to compute ECEF coordinates 3. Calculating ENU components through rotation matrix operations based on the reference point's geodetic coordinates The function provides customizable options including: - Selection of different reference ellipsoid models (e.g., Clarke 1866, GRS80) - Adjustment of output precision and formatting - Optional height reference systems By using ECEFtoENV, users can efficiently transform geocentric coordinates to ENU coordinates with enhanced accuracy for applications such as navigation systems, spatial analysis, and geophysical computations. The implementation ensures numerical stability through proper handling of coordinate singularities and ellipsoidal curvature corrections.