px4-firmware/msg/SensorOpticalFlow.msg

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uint64 timestamp # time since system start (microseconds)
uint64 timestamp_sample
uint32 device_id # unique device ID for the sensor that does not change between power cycles
float32[2] pixel_flow # (radians) optical flow in radians where a positive value is produced by a RH rotation about the body axis
float32[3] delta_angle # (radians) accumulated gyro radians where a positive value is produced by a RH rotation about the body axis. Set to NaN if flow sensor does not have 3-axis gyro data.
bool delta_angle_available
float32 distance_m # (meters) Distance to the center of the flow field
bool distance_available
uint32 integration_timespan_us # (microseconds) accumulation timespan in microseconds
uint8 quality # quality, 0: bad quality, 255: maximum quality
uint32 error_count
float32 max_flow_rate # (radians/s) Magnitude of maximum angular which the optical flow sensor can measure reliably
float32 min_ground_distance # (meters) Minimum distance from ground at which the optical flow sensor operates reliably
float32 max_ground_distance # (meters) Maximum distance from ground at which the optical flow sensor operates reliably
uint8 MODE_UNKNOWN = 0
uint8 MODE_BRIGHT = 1
uint8 MODE_LOWLIGHT = 2
uint8 MODE_SUPER_LOWLIGHT = 3
uint8 mode