px4-firmware/msg/obstacle_distance.msg

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# Obstacle distances in front of the sensor.
uint64 timestamp # time since system start (microseconds)
uint8 sensor_type # Type from MAV_DISTANCE_SENSOR enum.
uint8 MAV_DISTANCE_SENSOR_LASER = 0
uint8 MAV_DISTANCE_SENSOR_ULTRASOUND = 1
uint8 MAV_DISTANCE_SENSOR_INFRARED = 2
uint8 MAV_DISTANCE_SENSOR_RADAR = 3
uint16[72] distances # Distance of obstacles around the UAV with index 0 corresponding to local North. A value of 0 means that the obstacle is right in front of the sensor. A value of max_distance +1 means no obstacle is present. A value of UINT16_MAX for unknown/not used. In a array element, one unit corresponds to 1cm.
float32 increment # Angular width in degrees of each array element.
uint16 min_distance # Minimum distance the sensor can measure in centimeters.
uint16 max_distance # Maximum distance the sensor can measure in centimeters.
float32 angle_offset # Relative angle offset of the 0-index element in the distances array. Value of 0 corresponds to forward. Positive values are offsets to the right.
# TOPICS obstacle_distance obstacle_distance_fused