## Copyright (C) 2016 ## ## This program is free software; you can redistribute it and/or modify it under ## the terms of the GNU General Public License as published by the Free Software ## Foundation; either version 3 of the License, or (at your option) any later ## version. ## ## This program is distributed in the hope that it will be useful, but WITHOUT ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more ## details. ## ## You should have received a copy of the GNU General Public License along with ## this program; if not, see . ## -*- texinfo -*- ## @deftypefn {Function File} {@var{ecc} =} flat2ecc (@var{flat}) ## This will return the eccentricity given a flattening ## From https://en.wikipedia.org/wiki/Flattening ## ## e^2=2f-f^2 ## ## where f is the flattening and e is the eccentricity ## earth_flattening=1/298.257=0.0033528 ## and earth_eccentricity=.081819221456 ## ## @example ## >>e=flat2ecc(0.0033528) ## e = 0.081819 ## @end example ## @seealso{ecc2flat} ## @end deftypefn function e = flat2ecc(f) e = sqrt(2 * f - f ^ 2); endfunction