Name of planetary surface model, used to determine the surface altitude at a given latitude and longitude. The default is an ellipsoid model of the earth based on the WGS-84 standard. It is used in Gazebo's GPS sensor implementation. This field identifies how Gazebo world frame is aligned in Geographical sense. The final Gazebo world frame orientation is obtained by rotating a frame aligned with following notation by the field heading_deg (Note that heading_deg corresponds to positive yaw rotation in the NED frame, so it's inverse specifies positive Z-rotation in ENU or NWU). Options are: - ENU (East-North-Up) - NED (North-East-Down) - NWU (North-West-Up) For example, world frame specified by setting world_orientation="ENU" and heading_deg=-90° is effectively equivalent to NWU with heading of 0°. Geodetic latitude at origin of gazebo reference frame, specified in units of degrees. Longitude at origin of gazebo reference frame, specified in units of degrees. Elevation of origin of gazebo reference frame, specified in meters. Heading offset of gazebo reference frame, measured as angle between Gazebo world frame and the world_frame_orientation type (ENU/NED/NWU). Rotations about the downward-vector (e.g. North to East) are positive. The direction of rotation is chosen to be consistent with compass heading convention (e.g. 0 degrees points North and 90 degrees points East, positive rotation indicates counterclockwise rotation when viewed from top-down direction). The angle is specified in degrees.