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This work focuses on the use of terrestrial laser scanner (TLS) in the characterization of volcanic&#13; environments. A TLS survey of the Vesuvius crater (Somma-Vesuvius volcano, Italy) allows the construction&#13; of an accurate, georeferenced digital model of different sectors of the crater. In each sector, the intensity is&#13; computed for each point as the ratio between the emitted amplitude and the received one, normalized to the&#13; maximum signal, providing the radiometric information. Moreover, the RGB colours of the observed surfaces&#13; can be captured by means of a calibrated camera mounted on the TLS instrument. In this way, multi-band&#13; information is given, since a long range TLS operates in the near infrared band. The reflectance and RGB&#13; data are compared in order to verify if they are independent enough to be complementary for model analysis&#13; and inspection. Results show that the integration of RGB and intensity data can fully characterize this&#13; volcanic environment. The collected data are able to discriminate different volcanic deposits and to detect&#13; their stratigraphic features. In addition, our results shed light on the spatial extension of landslides and on&#13; the dimensions of rock fall/flow deposits affecting the inner walls of the crater. The remotely acquired TLS&#13; information from the Vesuvius crater is compared with that from a sedimentary terrain (coal-shale quarry) to&#13; detect possible similarities/differences between these two geological environments

Remote sensing of volcanic terrains by terrestrial laser scanner: preliminary reflectance and RGB implications for studying Vesuvius crater (Italy)