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Proceedings Paper

Creation of bathymetric maps using satellite imagery
Author(s): Bradley L. McCarthy; Richard C. Olsen; Angela M. Kim
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Paper Abstract

Coastal bathymetry near Camp Pendleton, California was measured using wave motion as observed by the WorldView-2 commercial satellite imaging system. The linear finite depth dispersion relation for surface gravity waves was used to determine nearshore ocean depth from successive images acquired of the coastal area. Principal component transformations of co-registered 8-color multispectral images were found to very effectively highlight wave crests in the surf zone. Time sequential principal component images then contain both spatial and temporal information. From these change detection images, wave celerity could be determined and depth inversion could be performed. For waves farther from shore, the principal component transformation no longer highlighted wave crests, but crests could be resolved within a single RGB composite image with equalization enhancement. The wavelength of a wave above a point of known depth was measured. The wave period method was used to determine depth for other waves in the propagation direction of this wave. Depth calculations using these methods compared favorably to reference bathymetry. The spatial resolution for this method of determining depth is higher and perhaps more accurate than the reference bathymetry used in this study, particularly in the surf zone.

Paper Details

Date Published: 4 May 2011
PDF: 12 pages
Proc. SPIE 8030, Ocean Sensing and Monitoring III, 80300C (4 May 2011); doi: 10.1117/12.883468
Show Author Affiliations
Bradley L. McCarthy, Naval Postgraduate School (United States)
Richard C. Olsen, Naval Postgraduate School (United States)
Angela M. Kim, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 8030:
Ocean Sensing and Monitoring III
Weilin W. Hou; Robert Arnone, Editor(s)

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