syntax = "proto2"; package sensor_msgs.msgs; message Groundtruth { required int64 time_usec = 1; required double latitude_rad = 2; required double longitude_rad = 3; required double altitude = 4; optional double velocity_east = 5; optional double velocity_north = 6; optional double velocity_up = 7; optional double attitude_q_w = 8; optional double attitude_q_x = 9; optional double attitude_q_y = 10; optional double attitude_q_z = 11; }