Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4879
AuthorsPesci, A.* 
Teza, G.* 
TitleEffects of surface irregularities on intensity data from laser scanning: an experimental approach.
Issue DateOct-2008
Series/Report no.5-6/51 (2008)
URIhttp://hdl.handle.net/2122/4879
KeywordsTerrestrial Laser Scanner
Intensity
Incidence Angle
Irregular surfaces
Data Acquisition and Processing
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractThe results of an experiment carried out with the aim to investigate the role of surface irregularities on the intensity data provided by a terrestrial laser scanner (TLS) survey are reported here. Depending on surface roughness, the interaction between an electromagnetic wave and microscopic irregularities leads to a Lambertian-like diffusive light reflection, allowing the TLS to receive the backscattered component of the signal. The described experiment consists in a series of TLS-based acquisitions of a rotating artificial target specifically conceived in order to highlight the effects on the intensity data due to surface irregularity. This target is articulated in a flat plate and in an irregular surface, whose macro-roughness has a characteristic length with the same order of the spot size. Results point out the different behavior of the plates. The intensity of the signal backscattered by the planar element decreases if the incidence angle increases, whereas the intensity of the signal backscattered by the irregular surface is almost constant if the incidence angle varies. Since the typical surfaces acquired in a geological/geophysical survey are generally irregular, these results imply that the intensity data can be easily used in order to evaluate the reflectance of the material at the considered wavelength, e.g. for pattern recognition purposes.
Appears in Collections:Annals of Geophysics
Papers Published / Papers in press

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