Local tangent plane coordinates
Geographic coordinate system / From Wikipedia, the free encyclopedia
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Local tangent plane coordinates (LTP), also known as local ellipsoidal system,[1][2] local geodetic coordinate system,[3] or local vertical, local horizontal coordinates (LVLH), are a spatial reference system based on the tangent plane defined by the local vertical direction and the Earth's axis of rotation. It consists of three coordinates: one represents the position along the northern axis, one along the local eastern axis, and one represents the vertical position. Two right-handed variants exist: east, north, up (ENU) coordinates and north, east, down (NED) coordinates. They serve for representing state vectors that are commonly used in aviation and marine cybernetics.