Five-minute grid of total marine bird biomass densities surveyed off central California - selected cool water temperature periods, 1980-2001 (CDAS data set AL3_MASS.shp)
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AL3_MASS is a polygon shapefile representing 5 minute x 5 minute latitude x longitude cells that house the overall total biomass densities (kg/sq km) of up to 76 species of marine birds during periods of realtively cold or cool sea surface temperatures. Density for each of 76 marine bird species was multiplied by average body mass for that species, and these products summed for all species in a...
AL3_MASS 为一个多边形形状文件，该文件代表经纬度各为5分钟x5分钟的网格，用于表示在相对寒冷或凉爽的海面水温期间，至多76种海洋鸟类总体生物量密度（千克/平方公里）。对于76种海洋鸟类中的每一种，其密度均乘以该物种的平均体重，然后将所有物种的乘积相加...
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