Federal Agency for Nature Conservation: Porpoise Monitoring Dissemination Single Years (WFS)

This data set contains information on the population density of porpoises in the German offshore areas based on a 10x10 km grid (EU-GRID). The density [individuals/km²] is determined for each grid cell by adding the individual number of counting points within the respective grid cell and dividing it by the sum of the effort at the counting points. Individual layers show bottom by season (March — May: Spring; June — August: Summer; September — November: Autumn; December — February: Winter) the distribution of porpoises in the respective year. In addition to porpoise density, the density of the sighted juveniles is also determined. A more detailed description of the methodology can be found in the monitoring reports of the BfN (https://www.bfn.de/wirbeltiere) or in a summary at http://www.wal-und-mensch.de/wum2006/gilles.php. The data are based on the pig whale recordings carried out within the framework of the BfN monitoring programme.

本数据集依托10×10公里网格（EU-GRID），收录德国近海海域鼠海豚的种群密度数据。各网格单元的密度（单位：个体/平方公里）通过如下方式计算：统计对应网格内所有计数点的个体总数，再除以各计数点的总采样努力量。各图层按季节（3月—5月为春季；6月—8月为夏季；9月—11月为秋季；12月—2月为冬季）展示对应年份的鼠海豚分布状况。除鼠海豚种群密度外，本数据集同时统计了观测到的幼年个体密度。有关调查方法的详细说明，可查阅德国联邦自然保护局（BfN）的监测报告（https://www.bfn.de/wirbeltiere），或访问http://www.wal-und-mensch.de/wum2006/gilles.php查看方法概要。本数据集基于BfN监测计划框架内开展的鼠海豚观测记录整理而成。