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Power spectrum and fractal dimension of laser backscattering from the ocean

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Abstract

We flew an airborne lidar perpendicular to the coastline along straight-line transects that varied in length between 230 and 280km. The sample spacing was 3m, so we sampled almost five decades of spatial scales. Except for the return from right at the surface, the power spectra of backscattered power had a power-law dependence on spatial frequency, with a slope of 1.49. This corresponds to a fractal dimension of 1.76. This implies that the distribution is not as patchy as that of a purely turbulent process.

© 2006 Optical Society of America

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