Generation of Digital Orthophotos from IKONOS Satellite Images
Publication: Journal of Surveying Engineering
Volume 129, Issue 2
Abstract
Due to its high spatial resolution, IKONOS imagery has the highest potential for large-scale topographic mapping of the resource satellites currently available. The orthorectification of IKONOS images thus becomes an important task. Since raw image data would, in general, not be provided by the satellite company, we have developed a method that performs the rectification of IKONOS GEO images. The proposed scheme includes the following steps: (1) the correction of relief displacement for ground control points (GCPs); (2) the performing of affine transformation between the ground coordinate system and the image coordinate system; (3) the performing of back projection for each pixel in the orthoimage; (4) the use of digital terrain model to calculate the relief displacement for the pixel in the previous step; and (5) image resampling. The experimental results indicate that the generated orthoimage may reach an accuracy of 2 m, when 6 GCPs are used.
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References
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Information & Authors
Information
Published In
Journal of Surveying Engineering
Volume 129 • Issue 2 • May 2003
Pages: 73 - 78
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Oct 16, 2001
Accepted: Mar 11, 2002
Published online: Apr 15, 2003
Published in print: May 2003
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