Evaluation and Improvement of Geopositioning Accuracy of IKONOS Stereo Imagery
Publication: Journal of Surveying Engineering
Volume 131, Issue 2
Abstract
IKONOS imagery has been used in many commercial, government, and research applications ranging from environment monitoring, to coastal change detection, and to national security. The high costs of IKONOS high end products (Pro and Precision products) make it extremely attractive to find practical methods that use lower-cost IKONOS Geo products to produce highly accurate mapping products. This paper presents four different models defined in both object space and image space to refine the rational function derived ground coordinates. The models are the translation, scale and translation, affine, and second-order polynomial models. Different configurations of ground control points (GCPs) are carefully examined to evaluate the impact on accuracy improvement. The models are tested based on two IKONOS stereo pairs acquired in the Lake Erie coastal area. It is demonstrated that if an appropriate model and GCPs are used, ground point errors can be reduced from in horizontal and from in vertical directions.
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Acknowledgments
This research is a part of a study supported by the National Science Foundation (NSF) Digital Government Program. Collaboration with the National Geodetic Survey/NOAA and the Ohio Department of Natural Resources (ODNR) is greatly appreciated. The writers also thank Ruijin Ma for assistance in GCPs data collection and processing.
References
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© 2005 ASCE.
History
Received: Dec 3, 2003
Accepted: Jun 22, 2004
Published online: May 1, 2005
Published in print: May 2005
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