Euclidian projection on ellipsoid and conic
Find the projection of point P in R^n on the ellipsoid
E = { x = x0 + U*(z.*radii) : |z| = 1 }, where U is orthogonal matrix of the orientation of E, radii are the axis lengths, and x0 is the center.
Or on generalized conic E = { x : x'*A*x + b'*x + c = 0 }.
The projection is the minimization problem:
min | x - P | (or max | x - P|) for x in E.
Method: solve the Euler Lagrange equation with respect to the Lagrange multiplier, which can be written as polynomial equation (from an idea by Roger Stafford)
Cite As
Bruno Luong (2024). Euclidian projection on ellipsoid and conic (https://www.mathworks.com/matlabcentral/fileexchange/27711-euclidian-projection-on-ellipsoid-and-conic), MATLAB Central File Exchange. Retrieved .
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- Mathematics and Optimization > Mapping Toolbox > Coordinate Reference Systems > Projected Coordinate Reference Systems >
- Radar > Mapping Toolbox > Coordinate Reference Systems > Projected Coordinate Reference Systems >
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EllipsePrj/
Version | Published | Release Notes | |
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1.4.0.0 | Fix a bug, Introducing an adjustable tolerance value for parabola detection |
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1.3.0.0 | Cosmetic changes + Script for test example for 2D conic projection |
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1.2.0.0 | Extend to generalized conic (ellipsoid, paraboloid, hyperboloid, etc...) |
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1.0.0.0 |