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Remote Sens. 2018, 10(1), 98; https://doi.org/10.3390/rs10010098

Correction of Pushbroom Satellite Imagery Interior Distortions Independent of Ground Control Points

1,2,†,* , 1,2,†
,
2,3
and
1,2
1
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
2
Collaborative Innovation Center of Geospatial Technology, Wuhan University, Wuhan 430079, China
3
China Academy of Space Technology, Beijing 100094, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 28 October 2017 / Revised: 9 January 2018 / Accepted: 10 January 2018 / Published: 12 January 2018
(This article belongs to the Section Remote Sensing Image Processing)
View Full-Text   |   Download PDF [4842 KB, uploaded 12 January 2018]   |  

Abstract

Compensating for distortions in pushbroom satellite imagery has a bearing on subsequent earth observation applications. Traditional distortion correction methods usually depend on ground control points (GCPs) acquired from a high-accuracy geometric calibration field (GCF). Due to the high construction costs and site constraints of GCF, it is difficult to perform distortion detection regularly. To solve this problem, distortion detection methods without using GCPs have been proposed, but their application is restricted by rigorous conditions, such as demanding a large amount of calculation or good satellite agility which are not met by most remote sensing satellites. This paper proposes a novel method to correct interior distortions of satellite imagery independent of GCPs. First, a classic geometric calibration method for pushbroom satellite is built and at least three images with overlapping areas are collected, then the forward intersection residual between corresponding points in the images are used to calculate interior distortions. Experiments using the Gaofen-1 (GF-1) wide-field view-1 (WFV-1) sensor demonstrate that the proposed method can increase the level of orientation accuracy from several pixels to within one pixel, thereby almost eliminating interior distortions. Compared with the orientation accuracy by classic GCF method, there exists maximum difference of approximately 0.4 pixel, and the reasons for this discrepancy are analyzed. Generally, this method could be a supplementary method to conventional methods to detect and correct the interior distortion. View Full-Text
Keywords: distortion detection; forward intersection residual; Gaofen-1; ground control points; satellite image distortion detection; forward intersection residual; Gaofen-1; ground control points; satellite image
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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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Zhang, G.; Xu, K.; Zhang, Q.; Li, D. Correction of Pushbroom Satellite Imagery Interior Distortions Independent of Ground Control Points. Remote Sens. 2018, 10, 98.

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