Mr. Shanwei Liu Profile

Shanwei Liu

at YIC

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Proceedings Article | 10 October 2009 Paper

A method of accurate location for island away from mainland by remote sensing

Shanwei Liu, Jie Zhang, Yi Ma

Proceedings Volume 7471, 74710V (2009) https://doi.org/10.1117/12.836327

KEYWORDS: Data modeling, Distortion, Remote sensing, Affine motion model, Satellites, Sensors, Satellite imaging, Image resolution, Zoom lenses, Earth observing sensors

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The accuracy of geographic location is important for island investigations by remote sensing. However, many islands are far away from land, and it is impossible to obtain accurate ground control points (GCPs) that could be used for geometric correction. We propose a geometric correction method without using GCP to orientate islands accurately. The test data are four SPOT-5 images that were obtained from the same orbit and at the same time; one of these images does not include islands but allows one or more GCPs to be acquired. Firstly, we initially correct the image with GCPs by using a physical model, metadata, and a digital elevation model derived from SRTM data, but the accuracy is slightly better than 50 m. We calculate the offset between the corrected image and its GCPs and use this offset to correct the digital elevation model to make its coordinates to agree with that from the metadata. Then, we further correct the image by using a physical model, metadata and the corrected digital elevation model to suppress the hypsographical distortion. Finally, We use an affine transformation model to calculate the distortion parameters from the corrected image by using its GCPs, and further used these parameters to correct the other three images without GCPs. Our experiment is quite encouraging as when some islands are 159 km away from land we still achieve a location accuracy better than 5 m.

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