Abstract

Abstract. This paper proposes a POS aided LiDAR strip adjustment method. Firstly, aero-triangulation of the simultaneously obtained aerial images is conducted with a few photogrammetry-specific ground control points. Secondly, LiDAR intensity images are generated from the reflectance signals of laser foot points, and conjugate points are automatically matched between the LiDAR intensity image and the aero-triangulated aerial image. Control points used in LiDAR strip adjustment are derived from these conjugate points. Finally, LiDAR strip adjustment of real data is conducted with the POS aided LiDAR strip adjustment method proposed in this paper, and comparison experiment using three-dimensional similarity transformation method is also performed. The results indicate that the POS aided LiDAR strip adjustment method can significantly correct the planimetric and vertical errors of LiDAR strips. The planimetric correction accuracy is higher than average point distance while the vertical correction accuracy is comparable to that of the result of aero-triangulation. Moreover, the proposed method is obliviously superior to the traditional three-dimensional similarity transformation method.

Highlights

  • Airborne Light Detecting and Ranging (Airborne LiDAR) is a commonly used system for the fast acquisition of topographic information, which is known as Airborne Laser Scanning (ALS)

  • The LiDAR intensity images are generated from LiDAR point cloud at a sampling interval of 0.2m and 9331 pair of conjugate points are matched between the 1:3 aerial images and LiDAR intensity images

  • 2544 pairs are on Las1 including 918 pairs of planimetric-vertical control points and 1626 pairs of planimetric control points, 3724 pairs are on Las2 including 1096 pairs of planimetricvertical control points and 2628 pairs of planimetric control points, 3063 pairs are on Las3 including 906 pairs of planimetric-vertical control points and 2157 pairs of planimetric control points

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Summary

Introduction

Airborne Light Detecting and Ranging (Airborne LiDAR) is a commonly used system for the fast acquisition of topographic information, which is known as Airborne Laser Scanning (ALS). The three components of LiDAR are Laser Scanner, Global Positioning System (GPS), and Inertial Measurement Unit (IMU). The GPS and IMU are highly integrated to compose the Positioning and Orientation System (POS). Due to its character as a combined system, the coordinates of points collected by LiDAR suffer from many systematic errors and some random errors. The major systematic errors include range errors, mirror angle scale errors, mounting errors, and POS systematic errors (Baltsavias, 1999; Filin, 2003; Habib et al, 2009; Habib et al, 2010; Kumari et al, 2011). There will be discrepancies among overlapping LiDAR strips and between LiDAR strips and ground truth if these systematic errors haven’t been eliminated

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