GCS
// Specification of Object Reference Model (ORM)
// Specification of Projection Basis
// Origin of Coordinate System
// 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
SRM_FLOAT64 y // meters; positive northward
SRM_FLOAT64 z // meters; Elevation or height;
// positive along XY surface normal