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ecef2lla.m
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ecef2lla.m
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% ECEF2LLA - convert earth-centered earth-fixed (ECEF)
% cartesian coordinates to latitude, longitude,
% and altitude
%
% USAGE:
% [lat,lon,alt] = ecef2lla(x,y,z)
%
% lat = geodetic latitude (radians)
% lon = longitude (radians)
% alt = height above WGS84 ellipsoid (m)
% x = ECEF X-coordinate (m)
% y = ECEF Y-coordinate (m)
% z = ECEF Z-coordinate (m)
%
% Notes: (1) This function assumes the WGS84 model.
% (2) Latitude is customary geodetic (not geocentric).
% (3) Inputs may be scalars, vectors, or matrices of the same
% size and shape. Outputs will have that same size and shape.
% (4) Tested but no warranty; use at your own risk.
% (5) Michael Kleder, April 2006
function [lat,lon,alt] = ecef2lla(x,y,z)
% WGS84 ellipsoid constants:
a = 6378137;
e = 8.1819190842622e-2;
% calculations:
b = sqrt(a^2*(1-e^2));
ep = sqrt((a^2-b^2)/b^2);
p = sqrt(x.^2+y.^2);
th = atan2(a*z,b*p);
lon = atan2(y,x);
lat = atan2((z+ep^2.*b.*sin(th).^3),(p-e^2.*a.*cos(th).^3));
N = a./sqrt(1-e^2.*sin(lat).^2);
alt = p./cos(lat)-N;
% return lon in range [0,2*pi)
lon = mod(lon,2*pi);
% correct for numerical instability in altitude near exact poles:
% (after this correction, error is about 2 millimeters, which is about
% the same as the numerical precision of the overall function)
k=abs(x)<1 & abs(y)<1;
alt(k) = abs(z(k))-b;
return