© 2006 International Council for the Exploration of the Sea
Lidar target-strength measurements on Northeast Atlantic mackerel (Scomber scombrus)
a Institute of Marine Research, Nordnesgaten 50, PO Box 1870 Nordnes, 5817 Bergen, Norway
b National Oceanic and Atmospheric Administration, Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, USA
*Correspondence to E. Tenningen: tel: +47 5523 8500; fax: +47 5523 8531. e-mail: eirik.tenningen{at}imr.no.
A linearly polarized green (532 nm) laser and a digital video camera were used to determine the reflectivity (R) and lidar (LIght Detection And Ranging) target strength (TS) of live mackerel by comparison with a standard calibration target. The measured reflectivity was 0.0141 ± 0.0005 when the receiver was copolarized with the laser and 0.0092 ± 0.0004 when the receiver was cross-polarized. The corresponding TS values were –42.66 ± 0.24 dB for the copolarized channel and –44.86 ± 0.23 dB for the cross-polarized channel. The depolarization ratio (depolarized return over total return) of 0.396 is very different from earlier measurements of sardine, suggesting that depolarization might be useful for species identification.
Keywords: lidar, mackerel, polarization, reflectivity, target strength
Received 9 June 2005; accepted 11 November 2005.
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