Talks and Poster Presentations (with Proceedings-Entry):
N. Pfeifer, P. Dorninger, A. Haring, H. Fan:
"Investigating terrestrial laser scanning intensity data: quality and functional relations";
Talk: International Conference on Optical 3-D Measurement Techniques VIII,
Zurich, Switzerland (invited);
- 2007-07-12; in: "International Conference on Optical 3-D Measurement Techniques VIII",
Terrestrial laser scanning is primarily used for recording dense cloud of points on objects. However,
laser scanners record the optical power of the backscattered echo of the emitted signal, too. These
values are supplied as so-called intensity. The intensity values are investigated systematically for
one scanner (Riegl LMS-Z420i). For doing so, we use targets with known reflectivity and scattering
characteristics. It shows that an inverse-square-law, relating intensity to range, is too simple. An
empirical data driven model is thus derived and results are compared to the physical model. For our
experiment, covering a distance range of 1.2-48m, angle of incidence 0-70°, and target reflectivity
5-99%, the intensity values in the range [0.1,0.3] could be predicted with a r.m.s.e. of 0.011.
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.