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The intensity information from terrestrial laser scanners (TLS) has become an important object of study in recent years, and there are an increasing number of
applications that would benefit from the a ddition of calibrated intensity data
to the topographic information. In this paper, we study the range and incidence angle effects on the intensity measurements and search for pr actical correction methods for different TLS instruments and targets. We find that the range (distance) effect is strongly dominated by instrumental factors, whereas the incidence
angle effect is mainly caused by the target surface properties.Correction for both effects is possible,but more studies are needed for physical interpretation and more efficient use of intensity data for target characterization.
The intensity information from terrestrial laser scanners (TLS) has become an important object of study in recent years, and there are an increasing number of
applications that would benefit from the a ddition of calibrated intensity data
to the topographic information. In this paper, we study the range and incidence angle effects on the intensity measurements and search for pr actical correction methods for different TLS instruments and targets. We find that the range (distance) effect is strongly dominated by instrumental factors, whereas the incidence
angle effect is mainly caused by the target surface properties.Correction for both effects is possible,but more studies are needed for physical interpretation and more efficient use of intensity data for target characterization.

