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Geocentric Linear Velocity?

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Given a geocentric/world coordinate(x, y, z)[meters], heading[deg] and velocity[m/s] how would I calculate its linear velocity (vx, vy, vz) in the geocentric coordinate system? Thanks, Andrew

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This is a nontrivial problem. What is the surface in question (sphere, ellipsoid, etc.)? And by velocity, do you mean its velocity across the surface?

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since you mention only one angle, i assume youre dealing with motion constrained to a surface.

which leaves one important question: what kind of surface?

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