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Remote Sens. 2016, 8(3), 251; doi:10.3390/rs8030251

Correction of Incidence Angle and Distance Effects on TLS Intensity Data Based on Reference Targets

1
College of Surveying and Geo-Informatics, Tongji University, NO. 1239, Siping Road, Shanghai 200092, China
2
Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China
*
Author to whom correspondence should be addressed.
Academic Editors: Randolph H. Wynne and Prasad S. Thenkabail
Received: 7 January 2016 / Revised: 25 February 2016 / Accepted: 4 March 2016 / Published: 16 March 2016
View Full-Text   |   Download PDF [2941 KB, uploaded 16 March 2016]   |  

Abstract

The original intensity value recorded by terrestrial laser scanners is influenced by multiple variables, among which incidence angle and distance play a crucial and dominant role. Further studies on incidence angle and distance effects are required to improve the accuracy of currently available methods and to implement these methods in practical applications. In this study, the effects of incidence angle and distance on intensity data of the Faro Focus3D 120 terrestrial laser scanner are investigated. A new method is proposed to eliminate the incidence angle and distance effects. The proposed method is based on the linear interpolation of the intensity values of reference targets previously scanned at various incidence angles and distances. Compared with existing methods, a significant advantage of the proposed method is that estimating the specific function forms of incidence angle versus intensity and distance versus intensity is no longer necessary; these are canceled out when the scanned and reference targets are measured at the same incidence angle and distance. Results imply that the proposed method has high accuracy and simplicity in eliminating incidence angle and distance effects and can significantly reduce the intensity variations caused by these effects on homogeneous surfaces. View Full-Text
Keywords: Incidence angle; distance; intensity correction; terrestrial laser scanning; Lambert’s cosine law, radar range equation Incidence angle; distance; intensity correction; terrestrial laser scanning; Lambert’s cosine law, radar range equation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tan, K.; Cheng, X. Correction of Incidence Angle and Distance Effects on TLS Intensity Data Based on Reference Targets. Remote Sens. 2016, 8, 251.

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