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The intensities field should contain the measured intensity (i.e. brightness) of the reflected laser beams. This is, however, device specific and thus you cannot really make any assumptions about the values. In general, the higher the value, the brighter the reflected laser beam.

You can use the intensities to make some assumptions about the properties of the scanned material. E.g. it is used to detect reflectors and reflector tape, as there the intensity of the reflected beam is, in general, higher than from other material.

E.g. the Hokyuo Laser scanner provides full intensities, whereas the Sick S300 only provides information about whether it detects a Reflector Tape (0 if none, not 0 if a reflector tape detected).