A lidar system was used in a seawater tank to measure the average diffuse reflectivity of live sardines. Diffuse reflectivity was measured to be 10% for a copolarized laser return and 3% for a cross-polarized return. We used these calibration measurements to infer the density of sardines in areas of the Southern California Eight from vertical profiles obtained with the lidar mounted on a ship. Within schools densities up to similar to 0.01 kg m(-3) were observed. During hourly survey periods total habitat densities up to similar to 2 X 10(-3) kg m(-2) were observed. (C) 1997 Optical Society of America.
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机译：在海水储罐中使用激光雷达系统测量活沙丁鱼的平均漫反射率。测得对于共偏振激光返回的漫反射率为10％，对于交叉偏振返回的漫反射率为3％。我们使用这些校准测量从安装在船上的激光雷达获得的垂直剖面推断南加州八区的沙丁鱼密度。在学校内部，观察到的密度高达0.01 kg m（-3）。在每小时的调查期内，观察到的总栖息地密度高达2 X 10（-3）kg m（-2）。 （C）1997年美国眼镜学会。
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