Local Tangent Plane
// Specification of Object Reference Model (ORM)
SRM_HORIZONTAL_DATUM_ENUM horizontal_datum
SRM_VERTICAL_DATUM_ENUM vertical_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
// Coordinate System Units
SRM_DISTANCE_UNITS_ENUM z_units // feet or meters
// 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)
SRM_FLOAT64 z // Elevation or height; positive along XY surface normal