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Geosphere; June 2008; v. 4; no. 3; p. 564-575; DOI: 10.1130/GES00155.1
© 2008 Geological Society of America
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A cost-efficient solution to true color terrestrial laser scanning

Peter D. White*,1 and Richard R. Jones*,2

1 School of Engineering, Durham University, Durham DH1 3LE, UK
2 Geospatial Research Ltd., Department of Earth Sciences, and e-Science Research Institute, Durham University, Durham DH1 3LE, UK

This paper presents a low-cost true color terrestrial laser scanning system, described in terms of the hardware and software elements necessary to add color capability to existing non-color laser scanners. A purpose-built camera mount allows a digital camera to be positioned coincident and collinear with the beam detector of the laser scanner device, such that mismatch between color data and laser scan points is minimized. An analytic mapping implemented in a Matlab toolbox registers the photographs, after rectification, with the laser scan point cloud, by solving for two tie-points per image. The resulting true color point clouds are accurate and easily interpretable. The adjustable camera mount fits a range of cameras and, with minor adaptation, could be used with different laser scanner devices. A detailed error analysis will allow comparisons to be drawn with alternative technologies, such as photogrammetry and commercial true color laser scanners. This low-cost, accurate, and flexible true color laser scanning technology has the potential to make a significant improvement to existing methods of spatial data acquisition.

Keywords: laser scanner • point cloud • color matching • camera calibration • lidar • terrestrial laser scanning






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