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Title: Calibration of boresight offset of LROC NAC imagery for precision lunar topographic mapping
Authors: Wu, B 
Liu, WC 
Issue Date: Jun-2017
Source: ISPRS journal of photogrammetry and remote sensing, June 2017, v. 128, p. 372-387
Abstract: High-resolution and high-precision lunar topographic information is essential for lunar exploration and scientific research. The lunar surface imagery acquired by the Narrow Angle Cameras (NACs) of NASA's Lunar Reconnaissance Orbiter Camera (LROC) is a valuable dataset for lunar topographic mapping because of its very fine ground sampling distance (GSD) of 0.5-2 m. The NACs have a unique configuration consisting of two separate cameras closely mounted. This configuration enables the collection of lunar surface images with both large coverage and high resolution. However, the mapping results from the NAC images depend highly on the accuracy of the relative alignment (referred to as boresight offset) between the two NACs. This paper firstly presents the details of the NAC sensor configuration and orientations. Then, an approach to calibrate the boresight offsets of the two NACs is presented. By using triple-matching tie points between the NAC images, the boresight offsets are improved based on the geometric model through a least-squares adjustment. Experiments using typical NAC stereo images show that there are inconsistencies as great as 80 m in object space in the topographic models generated using the pre-flight determined SPICE kernels. The inconsistencies are well improved using the image orientation parameters derived from the temperature-dependent SPICE kernels recently released by the LROC team, however there are still small inconsistencies of about 5-10 m in object space, which can be further reduced to meter level by using the method proposed in this paper. This method is of significance for generating lunar topographic models with high precision and internal consistency from NAC imagery.
Keywords: Lunar Topography
LRO
LROC
NAC
Boresight offset
Publisher: Elsevier
Journal: ISPRS journal of photogrammetry and remote sensing 
ISSN: 0924-2716
EISSN: 1872-8235
DOI: 10.1016/j.isprsjprs.2017.04.012
Rights: © 2017 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS). Published by Elsevier B.V. All rights reserved.
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
The following publication Wu, B., & Liu, W. C. (2017). Calibration of boresight offset of LROC NAC imagery for precision lunar topographic mapping. ISPRS Journal of Photogrammetry and Remote Sensing, 128, 372-387 is available at https://doi.org/10.1016/j.isprsjprs.2017.04.012
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