Curvilinear coordinates
COORDINATE SYSTEM WHOSE DIRECTIONS VARY IN SPACE
Curvilinear; Parametric coordinates; Parametric coordinate; Parametric coord; Lamé coefficients; Curvilinear coordinate system; Curvalinear coordinate systems; Orthogonal curvilinear coordinates; Curvilinear coordinate; Lamé coefficients (curvilinear coordinates)
In geometry, curvilinear coordinates are a coordinate system for Euclidean space in which the coordinate lines may be curved. These coordinates may be derived from a set of Cartesian coordinates by using a transformation that is locally invertible (a one-to-one map) at each point.