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Remote Sens. 2014, 6(6), 4647-4659; doi:10.3390/rs6064647

Improving the Geolocation Algorithm for Sensors Onboard the ISS: Effect of Drift Angle

1
Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 9 Dengzhuang South Road, Haidian, Beijing 100094, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Earth System Science and Policy, University of North Dakota, Grand Forks, ND 58202, USA
4
Key Laboratory of Aviation Information and Control Technology in Universities of Shandong (Binzhou University), No. 391 Yellow River Fifth Road, Binzhou 256603, China
*
Author to whom correspondence should be addressed.
Received: 13 December 2013 / Revised: 4 May 2014 / Accepted: 15 May 2014 / Published: 26 May 2014
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Abstract

The drift angle caused by the Earth’s self-rotation may introduce rotational displacement artifact on the geolocation results of imagery acquired by an Earth observing sensor onboard the International Space Station (ISS). If uncorrected, it would cause a gradual degradation of positional accuracy from the center towards the edges of an image. One correction method to account for the drift angle effect was developed. The drift angle was calculated from the ISS state vectors and positional information of the ground nadir point of the imagery. Tests with images acquired by the International Space Station Agriculture Camera (ISSAC) using Google EarthTM as a reference indicated that applying the drift angle correction can reduce the residual geolocation error for the corner points of the ISSAC images from over 1000 to less than 500 m. The improved geolocation accuracy is well within the inherent geolocation uncertainty of up to 800 m, mainly due to imprecise knowledge of the ISS attitude and state parameters required to perform the geolocation algorithm. View Full-Text
Keywords: drift angle; ISS; geolocation; unit quaternion; ISSAC drift angle; ISS; geolocation; unit quaternion; ISSAC
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Dou, C.; Zhang, X.; Guo, H.; Han, C.; Liu, M. Improving the Geolocation Algorithm for Sensors Onboard the ISS: Effect of Drift Angle. Remote Sens. 2014, 6, 4647-4659.

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