ECEF
Earth-Centered, Earth-Fixed (ECEF) is a Cartesian coordinate system that is fixed with respect to the Earth. It is a three-dimensional coordinate system with its origin at the center of the Earth. The X-axis passes through the intersection of the prime meridian and the equator, the Y-axis passes through the intersection of the prime meridian and the plane of the equator, and the Z-axis passes through the Earth's North Pole. ECEF is commonly used in the field of space and astronautical engineering to represent the position and velocity of objects in Earth's orbit or in space relative to the Earth.
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