Local Tangent Plane (2D)
// Specification of Object Reference Model (ORM)
SRM_HORIZONTAL_DATUM_ENUM horizontal_datum
// Specification of Projection Basis
// Origin of Coordinate System
SRM_FLOAT64 geodetic_longitude // degrees
SRM_FLOAT64 geodetic_latitude // degrees
SRM_FLOAT64 azimuth // angle, in arc degrees, positive clockwise,
// from geographic north to the direction
// of the positive Y axis
// Origin Displacement of Coordinate System
SRM_FLOAT64 x_offset // origin relative displacement in X
SRM_FLOAT64 y_offset // origin relative displacement in Y
SRM_FLOAT64 x // meters; positive eastward (when azimuth equal zero)
SRM_FLOAT64 y // meters; positive northward (when azimuth equal zero)