Correction of Intensity Incidence Angle Effect in Terrestrial Laser Scanning
- Department of Photogrammetry and Remote Sensing, Finnish Geodetic Institute, P.O. Box 15, 02431 Masala, Finland
Keywords: Terrestrial laser scanning, Laser scanning intensity, incidence angle effect
Abstract. In this article, we have studied the incidence angle effect on Terrestrial Laser Scanning (TLS) intensity. In previous tests, it has been found that the backscattered intensity of an object affects the incidence angle effect. We made additional experiments to investigate the potential mixing of distance and incidence angle effects and the role of surface parameters such as object grain size and scanning wavelength. The results indicate that distance and incidence angle effects do not mix and laboratory measured correction values can be used to correct intensity data from field-scanned point clouds. We also compared the laboratory measurements to real world surfaces to validate the correction procedures in practical TLS applications. The idea is also to make practical recommendations for TLS intensity correction in most common TLS applications.