?? ellradii.m
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function [rm,rp,rl]=ellradii(lat,a,e2)% ELLRADII Computers radii of curvature at at a given latitude for% a given ellipsoid major semi-axis and eccentricity.% Version: 30 May 04% Useage: [rm,rp,rl]=ellradii(lat,a,e2)% Input: lat - vector of lats of local system origins (rad)% a - ref. ellipsoid major semi-axis% e2 - ref. ellipsoid eccentricity squared% Output: rm - radius of curvature of meridian/longitude ellipse% rp - radius of curvature of prime vertical% rl - radius of curvature of latitude circlerp=a./sqrt(1-e2.*sin(lat).^2);rm=rp.*(1-e2)./(1-e2.*sin(lat).^2);rl=rp*cos(lat);
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